/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain OctagonDomain -i ../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound10.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 22:53:27,005 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 22:53:27,007 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 22:53:27,044 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-02 22:53:27,044 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-02 22:53:27,046 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-02 22:53:27,049 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-02 22:53:27,052 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-02 22:53:27,056 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-02 22:53:27,061 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-02 22:53:27,062 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-02 22:53:27,064 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-02 22:53:27,064 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 22:53:27,067 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 22:53:27,067 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 22:53:27,068 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 22:53:27,069 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 22:53:27,070 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 22:53:27,072 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 22:53:27,076 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 22:53:27,077 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 22:53:27,078 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 22:53:27,079 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 22:53:27,080 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 22:53:27,088 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-02 22:53:27,088 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-02 22:53:27,088 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-02 22:53:27,090 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-02 22:53:27,090 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-02 22:53:27,090 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-02 22:53:27,091 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 22:53:27,091 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 22:53:27,092 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 22:53:27,093 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 22:53:27,093 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 22:53:27,094 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 22:53:27,094 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 22:53:27,094 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 22:53:27,094 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 22:53:27,095 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 22:53:27,095 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 22:53:27,097 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-02 22:53:27,128 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 22:53:27,128 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 22:53:27,129 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 22:53:27,129 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 22:53:27,130 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 22:53:27,130 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 22:53:27,130 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 22:53:27,130 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 22:53:27,130 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 22:53:27,130 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 22:53:27,131 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 22:53:27,131 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 22:53:27,131 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 22:53:27,131 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 22:53:27,132 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 22:53:27,132 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 22:53:27,132 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 22:53:27,132 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 22:53:27,132 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 22:53:27,133 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 22:53:27,133 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 22:53:27,133 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 22:53:27,133 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 22:53:27,133 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 22:53:27,133 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 22:53:27,134 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 22:53:27,134 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 22:53:27,134 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 22:53:27,134 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 22:53:27,134 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 22:53:27,134 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 22:53:27,134 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 22:53:27,135 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 22:53:27,135 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 22:53:27,135 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 22:53:27,135 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 22:53:27,135 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 22:53:27,135 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 22:53:27,135 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 22:53:27,135 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 22:53:27,135 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 22:53:27,136 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 22:53:27,375 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 22:53:27,402 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 22:53:27,404 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 22:53:27,405 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 22:53:27,405 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 22:53:27,406 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound10.c [2023-04-02 22:53:28,462 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 22:53:28,659 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 22:53:28,663 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound10.c [2023-04-02 22:53:28,668 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/201282d58/f2448b2a9c46451a98130e93367c52ae/FLAG37454e49c [2023-04-02 22:53:28,686 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/201282d58/f2448b2a9c46451a98130e93367c52ae [2023-04-02 22:53:28,689 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 22:53:28,690 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 22:53:28,692 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 22:53:28,692 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 22:53:28,698 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 22:53:28,699 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 10:53:28" (1/1) ... [2023-04-02 22:53:28,701 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@45e668e3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:53:28, skipping insertion in model container [2023-04-02 22:53:28,701 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 10:53:28" (1/1) ... [2023-04-02 22:53:28,707 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 22:53:28,722 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 22:53:28,865 WARN L247 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/egcd2-ll_valuebound10.c[490,503] [2023-04-02 22:53:28,902 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 22:53:28,912 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 22:53:28,923 WARN L247 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/egcd2-ll_valuebound10.c[490,503] [2023-04-02 22:53:28,945 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 22:53:28,958 INFO L208 MainTranslator]: Completed translation [2023-04-02 22:53:28,958 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:53:28 WrapperNode [2023-04-02 22:53:28,958 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 22:53:28,959 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 22:53:28,960 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 22:53:28,960 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 22:53:28,970 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:53:28" (1/1) ... [2023-04-02 22:53:28,970 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:53:28" (1/1) ... [2023-04-02 22:53:28,983 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:53:28" (1/1) ... [2023-04-02 22:53:28,984 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:53:28" (1/1) ... [2023-04-02 22:53:28,995 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:53:28" (1/1) ... [2023-04-02 22:53:28,998 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:53:28" (1/1) ... [2023-04-02 22:53:28,999 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:53:28" (1/1) ... [2023-04-02 22:53:28,999 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:53:28" (1/1) ... [2023-04-02 22:53:29,001 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 22:53:29,001 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 22:53:29,002 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 22:53:29,002 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 22:53:29,002 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:53:28" (1/1) ... [2023-04-02 22:53:29,013 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 22:53:29,021 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:53:29,034 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) [2023-04-02 22:53:29,054 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 [2023-04-02 22:53:29,083 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 22:53:29,084 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 22:53:29,084 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 22:53:29,085 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-02 22:53:29,085 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-02 22:53:29,085 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 22:53:29,085 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 22:53:29,085 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 22:53:29,086 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 22:53:29,086 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 22:53:29,086 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-02 22:53:29,086 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-02 22:53:29,086 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-02 22:53:29,087 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 22:53:29,087 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 22:53:29,087 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 22:53:29,087 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 22:53:29,087 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 22:53:29,087 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 22:53:29,087 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 22:53:29,154 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 22:53:29,156 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 22:53:29,430 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 22:53:29,461 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 22:53:29,462 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-04-02 22:53:29,464 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 10:53:29 BoogieIcfgContainer [2023-04-02 22:53:29,464 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 22:53:29,466 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 22:53:29,466 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 22:53:29,468 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 22:53:29,469 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 10:53:28" (1/3) ... [2023-04-02 22:53:29,469 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6ce801e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 10:53:29, skipping insertion in model container [2023-04-02 22:53:29,469 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:53:28" (2/3) ... [2023-04-02 22:53:29,470 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6ce801e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 10:53:29, skipping insertion in model container [2023-04-02 22:53:29,470 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 10:53:29" (3/3) ... [2023-04-02 22:53:29,471 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd2-ll_valuebound10.c [2023-04-02 22:53:29,486 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 22:53:29,486 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 22:53:29,541 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 22:53:29,548 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@53775838, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 22:53:29,548 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 22:53:29,552 INFO L276 IsEmpty]: Start isEmpty. Operand has 36 states, 16 states have (on average 1.375) internal successors, (22), 18 states have internal predecessors, (22), 14 states have call successors, (14), 4 states have call predecessors, (14), 4 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2023-04-02 22:53:29,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-04-02 22:53:29,559 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:53:29,559 INFO L195 NwaCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:53:29,560 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:53:29,566 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:53:29,566 INFO L85 PathProgramCache]: Analyzing trace with hash -106415626, now seen corresponding path program 1 times [2023-04-02 22:53:29,574 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:53:29,575 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [835045489] [2023-04-02 22:53:29,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:53:29,575 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:53:29,689 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:53:29,690 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [965741922] [2023-04-02 22:53:29,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:53:29,691 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:53:29,692 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:53:29,697 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) [2023-04-02 22:53:29,701 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-02 22:53:29,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:53:29,808 INFO L262 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 1 conjunts are in the unsatisfiable core [2023-04-02 22:53:29,813 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:53:29,855 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-04-02 22:53:29,855 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-02 22:53:29,855 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:53:29,855 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [835045489] [2023-04-02 22:53:29,856 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:53:29,856 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [965741922] [2023-04-02 22:53:29,856 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [965741922] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:53:29,857 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 22:53:29,857 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-04-02 22:53:29,859 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [217169196] [2023-04-02 22:53:29,859 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:53:29,863 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-04-02 22:53:29,864 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:53:29,901 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-04-02 22:53:29,902 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-04-02 22:53:29,904 INFO L87 Difference]: Start difference. First operand has 36 states, 16 states have (on average 1.375) internal successors, (22), 18 states have internal predecessors, (22), 14 states have call successors, (14), 4 states have call predecessors, (14), 4 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) Second operand has 2 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2023-04-02 22:53:29,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:53:29,954 INFO L93 Difference]: Finished difference Result 57 states and 86 transitions. [2023-04-02 22:53:29,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-04-02 22:53:29,956 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) Word has length 30 [2023-04-02 22:53:29,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:53:29,963 INFO L225 Difference]: With dead ends: 57 [2023-04-02 22:53:29,964 INFO L226 Difference]: Without dead ends: 32 [2023-04-02 22:53:29,967 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-04-02 22:53:29,971 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:53:29,973 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 44 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 22:53:29,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-04-02 22:53:30,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2023-04-02 22:53:30,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 16 states have internal predecessors, (17), 14 states have call successors, (14), 4 states have call predecessors, (14), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2023-04-02 22:53:30,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 43 transitions. [2023-04-02 22:53:30,011 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 43 transitions. Word has length 30 [2023-04-02 22:53:30,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:53:30,013 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 43 transitions. [2023-04-02 22:53:30,013 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2023-04-02 22:53:30,013 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 43 transitions. [2023-04-02 22:53:30,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-04-02 22:53:30,017 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:53:30,017 INFO L195 NwaCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:53:30,027 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-04-02 22:53:30,223 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-04-02 22:53:30,224 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:53:30,224 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:53:30,224 INFO L85 PathProgramCache]: Analyzing trace with hash -1527902876, now seen corresponding path program 1 times [2023-04-02 22:53:30,225 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:53:30,225 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [370630804] [2023-04-02 22:53:30,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:53:30,225 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:53:30,250 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:53:30,250 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1854536108] [2023-04-02 22:53:30,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:53:30,251 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:53:30,251 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:53:30,254 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) [2023-04-02 22:53:30,256 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-02 22:53:30,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:53:30,334 INFO L262 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 7 conjunts are in the unsatisfiable core [2023-04-02 22:53:30,337 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:53:30,411 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-04-02 22:53:30,412 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:53:30,503 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-04-02 22:53:30,503 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:53:30,503 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [370630804] [2023-04-02 22:53:30,503 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:53:30,504 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1854536108] [2023-04-02 22:53:30,504 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1854536108] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:53:30,504 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [844412601] [2023-04-02 22:53:30,529 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-02 22:53:30,529 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:53:30,533 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:53:30,538 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:53:30,538 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:53:30,641 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:53:31,200 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 22:53:31,202 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:53:31,207 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:53:31,592 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [844412601] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:53:31,592 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:53:31,592 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [5, 5] total 18 [2023-04-02 22:53:31,593 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [947022393] [2023-04-02 22:53:31,593 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:53:31,595 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-04-02 22:53:31,595 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:53:31,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-04-02 22:53:31,598 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=218, Unknown=0, NotChecked=0, Total=306 [2023-04-02 22:53:31,598 INFO L87 Difference]: Start difference. First operand 32 states and 43 transitions. Second operand has 15 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 states have internal predecessors, (10), 9 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-04-02 22:53:32,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:53:32,497 INFO L93 Difference]: Finished difference Result 42 states and 54 transitions. [2023-04-02 22:53:32,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-04-02 22:53:32,497 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 states have internal predecessors, (10), 9 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 31 [2023-04-02 22:53:32,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:53:32,500 INFO L225 Difference]: With dead ends: 42 [2023-04-02 22:53:32,500 INFO L226 Difference]: Without dead ends: 34 [2023-04-02 22:53:32,501 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 74 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=197, Invalid=505, Unknown=0, NotChecked=0, Total=702 [2023-04-02 22:53:32,502 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 68 mSDsluCounter, 1 mSDsCounter, 0 mSdLazyCounter, 146 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 217 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 22:53:32,505 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 4 Invalid, 217 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 146 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 22:53:32,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2023-04-02 22:53:32,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2023-04-02 22:53:32,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 16 states have (on average 1.1875) internal successors, (19), 17 states have internal predecessors, (19), 14 states have call successors, (14), 4 states have call predecessors, (14), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2023-04-02 22:53:32,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 45 transitions. [2023-04-02 22:53:32,520 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 45 transitions. Word has length 31 [2023-04-02 22:53:32,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:53:32,521 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 45 transitions. [2023-04-02 22:53:32,521 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 states have internal predecessors, (10), 9 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-04-02 22:53:32,521 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 45 transitions. [2023-04-02 22:53:32,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-04-02 22:53:32,523 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:53:32,523 INFO L195 NwaCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:53:32,533 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-04-02 22:53:32,729 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2023-04-02 22:53:32,729 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:53:32,730 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:53:32,730 INFO L85 PathProgramCache]: Analyzing trace with hash -115048975, now seen corresponding path program 1 times [2023-04-02 22:53:32,730 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:53:32,730 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1479224595] [2023-04-02 22:53:32,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:53:32,730 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:53:32,757 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:53:32,757 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1599527366] [2023-04-02 22:53:32,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:53:32,757 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:53:32,758 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:53:32,764 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) [2023-04-02 22:53:32,765 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-02 22:53:32,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:53:32,814 INFO L262 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 17 conjunts are in the unsatisfiable core [2023-04-02 22:53:32,816 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:53:32,899 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-04-02 22:53:32,900 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:53:32,965 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-04-02 22:53:32,966 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:53:32,966 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1479224595] [2023-04-02 22:53:32,966 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:53:32,966 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1599527366] [2023-04-02 22:53:32,966 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1599527366] provided 1 perfect and 1 imperfect interpolant sequences [2023-04-02 22:53:32,966 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-04-02 22:53:32,966 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 11 [2023-04-02 22:53:32,967 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1096246706] [2023-04-02 22:53:32,967 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:53:32,967 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-02 22:53:32,967 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:53:32,968 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-02 22:53:32,968 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2023-04-02 22:53:32,969 INFO L87 Difference]: Start difference. First operand 34 states and 45 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2023-04-02 22:53:33,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:53:33,026 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2023-04-02 22:53:33,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-02 22:53:33,026 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) Word has length 32 [2023-04-02 22:53:33,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:53:33,029 INFO L225 Difference]: With dead ends: 40 [2023-04-02 22:53:33,029 INFO L226 Difference]: Without dead ends: 38 [2023-04-02 22:53:33,029 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2023-04-02 22:53:33,034 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 7 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:53:33,040 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 116 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 22:53:33,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2023-04-02 22:53:33,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2023-04-02 22:53:33,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 20 states have internal predecessors, (22), 14 states have call successors, (14), 5 states have call predecessors, (14), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2023-04-02 22:53:33,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 48 transitions. [2023-04-02 22:53:33,062 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 48 transitions. Word has length 32 [2023-04-02 22:53:33,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:53:33,062 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 48 transitions. [2023-04-02 22:53:33,063 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2023-04-02 22:53:33,063 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 48 transitions. [2023-04-02 22:53:33,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-04-02 22:53:33,066 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:53:33,066 INFO L195 NwaCegarLoop]: trace histogram [6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:53:33,073 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-04-02 22:53:33,271 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:53:33,272 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:53:33,272 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:53:33,272 INFO L85 PathProgramCache]: Analyzing trace with hash 479602003, now seen corresponding path program 1 times [2023-04-02 22:53:33,273 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:53:33,273 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1209744742] [2023-04-02 22:53:33,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:53:33,273 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:53:33,285 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:53:33,285 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [677348865] [2023-04-02 22:53:33,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:53:33,285 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:53:33,286 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:53:33,287 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) [2023-04-02 22:53:33,289 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-02 22:53:33,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:53:33,335 INFO L262 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 27 conjunts are in the unsatisfiable core [2023-04-02 22:53:33,337 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:53:33,465 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-04-02 22:53:33,465 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:53:33,561 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-04-02 22:53:33,561 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:53:33,564 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1209744742] [2023-04-02 22:53:33,564 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:53:33,569 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [677348865] [2023-04-02 22:53:33,569 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [677348865] provided 1 perfect and 1 imperfect interpolant sequences [2023-04-02 22:53:33,569 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-04-02 22:53:33,569 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 12 [2023-04-02 22:53:33,570 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1248561125] [2023-04-02 22:53:33,571 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:53:33,571 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-02 22:53:33,571 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:53:33,571 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-02 22:53:33,572 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2023-04-02 22:53:33,573 INFO L87 Difference]: Start difference. First operand 38 states and 48 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-04-02 22:53:33,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:53:33,636 INFO L93 Difference]: Finished difference Result 51 states and 65 transitions. [2023-04-02 22:53:33,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-02 22:53:33,636 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 37 [2023-04-02 22:53:33,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:53:33,638 INFO L225 Difference]: With dead ends: 51 [2023-04-02 22:53:33,638 INFO L226 Difference]: Without dead ends: 49 [2023-04-02 22:53:33,639 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2023-04-02 22:53:33,640 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 6 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:53:33,641 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 125 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 22:53:33,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2023-04-02 22:53:33,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2023-04-02 22:53:33,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 24 states have (on average 1.1666666666666667) internal successors, (28), 25 states have internal predecessors, (28), 18 states have call successors, (18), 6 states have call predecessors, (18), 5 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2023-04-02 22:53:33,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 62 transitions. [2023-04-02 22:53:33,683 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 62 transitions. Word has length 37 [2023-04-02 22:53:33,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:53:33,684 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 62 transitions. [2023-04-02 22:53:33,684 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-04-02 22:53:33,684 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 62 transitions. [2023-04-02 22:53:33,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2023-04-02 22:53:33,688 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:53:33,688 INFO L195 NwaCegarLoop]: trace histogram [6, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:53:33,695 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-02 22:53:33,893 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:53:33,893 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:53:33,894 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:53:33,894 INFO L85 PathProgramCache]: Analyzing trace with hash 409789169, now seen corresponding path program 1 times [2023-04-02 22:53:33,894 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:53:33,894 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1718986819] [2023-04-02 22:53:33,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:53:33,895 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:53:33,906 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:53:33,906 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1512921944] [2023-04-02 22:53:33,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:53:33,906 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:53:33,906 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:53:33,907 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) [2023-04-02 22:53:33,910 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-02 22:53:33,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:53:33,966 INFO L262 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 27 conjunts are in the unsatisfiable core [2023-04-02 22:53:33,968 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:53:34,117 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2023-04-02 22:53:34,117 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:53:34,220 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2023-04-02 22:53:34,221 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:53:34,221 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1718986819] [2023-04-02 22:53:34,221 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:53:34,221 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1512921944] [2023-04-02 22:53:34,221 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1512921944] provided 1 perfect and 1 imperfect interpolant sequences [2023-04-02 22:53:34,221 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-04-02 22:53:34,221 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 12 [2023-04-02 22:53:34,221 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1362679093] [2023-04-02 22:53:34,222 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:53:34,222 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-02 22:53:34,222 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:53:34,222 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-02 22:53:34,223 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2023-04-02 22:53:34,223 INFO L87 Difference]: Start difference. First operand 48 states and 62 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) [2023-04-02 22:53:34,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:53:34,290 INFO L93 Difference]: Finished difference Result 55 states and 68 transitions. [2023-04-02 22:53:34,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-02 22:53:34,291 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) Word has length 42 [2023-04-02 22:53:34,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:53:34,292 INFO L225 Difference]: With dead ends: 55 [2023-04-02 22:53:34,292 INFO L226 Difference]: Without dead ends: 53 [2023-04-02 22:53:34,292 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2023-04-02 22:53:34,292 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 6 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:53:34,293 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 116 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 22:53:34,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2023-04-02 22:53:34,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2023-04-02 22:53:34,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 27 states have (on average 1.1481481481481481) internal successors, (31), 28 states have internal predecessors, (31), 18 states have call successors, (18), 7 states have call predecessors, (18), 6 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2023-04-02 22:53:34,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 65 transitions. [2023-04-02 22:53:34,308 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 65 transitions. Word has length 42 [2023-04-02 22:53:34,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:53:34,309 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 65 transitions. [2023-04-02 22:53:34,309 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) [2023-04-02 22:53:34,309 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 65 transitions. [2023-04-02 22:53:34,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-04-02 22:53:34,310 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:53:34,310 INFO L195 NwaCegarLoop]: trace histogram [6, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:53:34,318 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-04-02 22:53:34,515 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:53:34,516 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:53:34,516 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:53:34,516 INFO L85 PathProgramCache]: Analyzing trace with hash -1543565357, now seen corresponding path program 1 times [2023-04-02 22:53:34,516 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:53:34,516 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1976705249] [2023-04-02 22:53:34,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:53:34,517 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:53:34,528 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:53:34,528 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1799486074] [2023-04-02 22:53:34,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:53:34,528 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:53:34,529 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:53:34,530 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) [2023-04-02 22:53:34,543 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-04-02 22:53:34,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:53:34,590 INFO L262 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 24 conjunts are in the unsatisfiable core [2023-04-02 22:53:34,592 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:53:34,691 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-04-02 22:53:34,691 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:53:34,789 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:53:34,789 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1976705249] [2023-04-02 22:53:34,789 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:53:34,790 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1799486074] [2023-04-02 22:53:34,790 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1799486074] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:53:34,790 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1563372888] [2023-04-02 22:53:34,794 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-04-02 22:53:34,794 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:53:34,794 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:53:34,794 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:53:34,795 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:53:34,813 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:53:35,222 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2023-04-02 22:53:35,232 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 22:53:35,233 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:53:35,237 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:53:35,887 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1909#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:53:35,887 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:53:35,887 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-04-02 22:53:35,887 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2023-04-02 22:53:35,888 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [92676998] [2023-04-02 22:53:35,888 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-04-02 22:53:35,888 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-02 22:53:35,888 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:53:35,889 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-02 22:53:35,889 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=579, Unknown=0, NotChecked=0, Total=702 [2023-04-02 22:53:35,889 INFO L87 Difference]: Start difference. First operand 52 states and 65 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 2 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 22:53:36,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:53:36,045 INFO L93 Difference]: Finished difference Result 59 states and 71 transitions. [2023-04-02 22:53:36,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-02 22:53:36,046 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 2 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 47 [2023-04-02 22:53:36,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:53:36,046 INFO L225 Difference]: With dead ends: 59 [2023-04-02 22:53:36,046 INFO L226 Difference]: Without dead ends: 57 [2023-04-02 22:53:36,047 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 66 SyntacticMatches, 7 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 276 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=137, Invalid=675, Unknown=0, NotChecked=0, Total=812 [2023-04-02 22:53:36,047 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 12 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:53:36,048 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 113 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:53:36,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2023-04-02 22:53:36,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2023-04-02 22:53:36,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 31 states have internal predecessors, (34), 18 states have call successors, (18), 8 states have call predecessors, (18), 7 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2023-04-02 22:53:36,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 68 transitions. [2023-04-02 22:53:36,066 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 68 transitions. Word has length 47 [2023-04-02 22:53:36,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:53:36,066 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 68 transitions. [2023-04-02 22:53:36,066 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 2 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-04-02 22:53:36,066 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 68 transitions. [2023-04-02 22:53:36,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2023-04-02 22:53:36,069 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:53:36,069 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:53:36,075 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-04-02 22:53:36,274 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:53:36,275 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:53:36,275 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:53:36,276 INFO L85 PathProgramCache]: Analyzing trace with hash -1081154470, now seen corresponding path program 1 times [2023-04-02 22:53:36,276 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:53:36,276 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [51321645] [2023-04-02 22:53:36,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:53:36,276 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:53:36,293 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:53:36,293 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [26239441] [2023-04-02 22:53:36,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:53:36,294 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:53:36,294 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:53:36,298 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) [2023-04-02 22:53:36,299 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-04-02 22:53:36,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:53:36,351 INFO L262 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 9 conjunts are in the unsatisfiable core [2023-04-02 22:53:36,353 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:53:36,396 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2023-04-02 22:53:36,399 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:53:36,478 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2023-04-02 22:53:36,478 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:53:36,479 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [51321645] [2023-04-02 22:53:36,479 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:53:36,479 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [26239441] [2023-04-02 22:53:36,479 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [26239441] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:53:36,479 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1903167719] [2023-04-02 22:53:36,481 INFO L159 IcfgInterpreter]: Started Sifa with 31 locations of interest [2023-04-02 22:53:36,482 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:53:36,482 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:53:36,482 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:53:36,482 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:53:36,500 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:53:44,403 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-04-02 22:53:44,405 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 22:53:44,406 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:53:44,409 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:53:49,077 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2445#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-02 22:53:49,077 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:53:49,077 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:53:49,077 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2023-04-02 22:53:49,077 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1594440817] [2023-04-02 22:53:49,077 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 22:53:49,078 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-02 22:53:49,078 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:53:49,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-02 22:53:49,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=543, Unknown=0, NotChecked=0, Total=702 [2023-04-02 22:53:49,079 INFO L87 Difference]: Start difference. First operand 56 states and 68 transitions. Second operand has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 5 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) [2023-04-02 22:53:49,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:53:49,274 INFO L93 Difference]: Finished difference Result 103 states and 143 transitions. [2023-04-02 22:53:49,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-02 22:53:49,274 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 5 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) Word has length 56 [2023-04-02 22:53:49,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:53:49,275 INFO L225 Difference]: With dead ends: 103 [2023-04-02 22:53:49,275 INFO L226 Difference]: Without dead ends: 95 [2023-04-02 22:53:49,276 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 138 SyntacticMatches, 4 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 137 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=206, Invalid=724, Unknown=0, NotChecked=0, Total=930 [2023-04-02 22:53:49,276 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 34 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 147 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 161 SdHoareTripleChecker+Invalid, 177 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:53:49,277 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 161 Invalid, 177 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 147 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:53:49,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2023-04-02 22:53:49,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 86. [2023-04-02 22:53:49,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 44 states have (on average 1.2045454545454546) internal successors, (53), 45 states have internal predecessors, (53), 34 states have call successors, (34), 8 states have call predecessors, (34), 7 states have return successors, (32), 32 states have call predecessors, (32), 32 states have call successors, (32) [2023-04-02 22:53:49,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 119 transitions. [2023-04-02 22:53:49,302 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 119 transitions. Word has length 56 [2023-04-02 22:53:49,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:53:49,302 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 119 transitions. [2023-04-02 22:53:49,302 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 5 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) [2023-04-02 22:53:49,302 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 119 transitions. [2023-04-02 22:53:49,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2023-04-02 22:53:49,303 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:53:49,303 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:53:49,310 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-04-02 22:53:49,509 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:53:49,509 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:53:49,510 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:53:49,510 INFO L85 PathProgramCache]: Analyzing trace with hash 167472073, now seen corresponding path program 1 times [2023-04-02 22:53:49,510 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:53:49,510 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [689393350] [2023-04-02 22:53:49,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:53:49,510 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:53:49,524 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:53:49,524 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1900825445] [2023-04-02 22:53:49,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:53:49,525 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:53:49,525 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:53:49,526 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) [2023-04-02 22:53:49,536 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-04-02 22:53:49,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:53:49,595 INFO L262 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 36 conjunts are in the unsatisfiable core [2023-04-02 22:53:49,597 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:53:49,749 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 23 proven. 10 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2023-04-02 22:53:49,750 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:53:49,867 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 20 proven. 7 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2023-04-02 22:53:49,867 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:53:49,867 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [689393350] [2023-04-02 22:53:49,867 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:53:49,867 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1900825445] [2023-04-02 22:53:49,867 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1900825445] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:53:49,867 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [160770114] [2023-04-02 22:53:49,869 INFO L159 IcfgInterpreter]: Started Sifa with 30 locations of interest [2023-04-02 22:53:49,870 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:53:49,870 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:53:49,870 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:53:49,870 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:53:49,884 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:53:56,246 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-04-02 22:53:56,248 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 22:53:56,250 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:53:56,257 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:54:01,224 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3159#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-02 22:54:01,224 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:54:01,224 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:54:01,225 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7] total 14 [2023-04-02 22:54:01,225 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1923232045] [2023-04-02 22:54:01,225 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 22:54:01,225 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-04-02 22:54:01,225 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:54:01,226 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-04-02 22:54:01,226 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=893, Unknown=0, NotChecked=0, Total=1056 [2023-04-02 22:54:01,227 INFO L87 Difference]: Start difference. First operand 86 states and 119 transitions. Second operand has 14 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 12 states have internal predecessors, (35), 7 states have call successors, (22), 3 states have call predecessors, (22), 2 states have return successors, (19), 6 states have call predecessors, (19), 6 states have call successors, (19) [2023-04-02 22:54:01,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:54:01,718 INFO L93 Difference]: Finished difference Result 129 states and 184 transitions. [2023-04-02 22:54:01,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-04-02 22:54:01,718 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 12 states have internal predecessors, (35), 7 states have call successors, (22), 3 states have call predecessors, (22), 2 states have return successors, (19), 6 states have call predecessors, (19), 6 states have call successors, (19) Word has length 62 [2023-04-02 22:54:01,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:54:01,724 INFO L225 Difference]: With dead ends: 129 [2023-04-02 22:54:01,724 INFO L226 Difference]: Without dead ends: 125 [2023-04-02 22:54:01,725 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 159 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 331 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=208, Invalid=1274, Unknown=0, NotChecked=0, Total=1482 [2023-04-02 22:54:01,726 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 41 mSDsluCounter, 203 mSDsCounter, 0 mSdLazyCounter, 356 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 244 SdHoareTripleChecker+Invalid, 396 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 356 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-02 22:54:01,726 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 244 Invalid, 396 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 356 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-02 22:54:01,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2023-04-02 22:54:01,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 93. [2023-04-02 22:54:01,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 48 states have (on average 1.1875) internal successors, (57), 50 states have internal predecessors, (57), 36 states have call successors, (36), 9 states have call predecessors, (36), 8 states have return successors, (34), 33 states have call predecessors, (34), 34 states have call successors, (34) [2023-04-02 22:54:01,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 127 transitions. [2023-04-02 22:54:01,768 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 127 transitions. Word has length 62 [2023-04-02 22:54:01,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:54:01,768 INFO L495 AbstractCegarLoop]: Abstraction has 93 states and 127 transitions. [2023-04-02 22:54:01,768 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 12 states have internal predecessors, (35), 7 states have call successors, (22), 3 states have call predecessors, (22), 2 states have return successors, (19), 6 states have call predecessors, (19), 6 states have call successors, (19) [2023-04-02 22:54:01,768 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 127 transitions. [2023-04-02 22:54:01,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2023-04-02 22:54:01,769 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:54:01,769 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:54:01,776 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-04-02 22:54:01,970 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-04-02 22:54:01,970 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:54:01,971 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:54:01,971 INFO L85 PathProgramCache]: Analyzing trace with hash -21023173, now seen corresponding path program 2 times [2023-04-02 22:54:01,971 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:54:01,971 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [239763252] [2023-04-02 22:54:01,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:54:01,971 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:54:01,980 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:54:01,981 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [675166152] [2023-04-02 22:54:01,981 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:54:01,981 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:54:01,981 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:54:01,982 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) [2023-04-02 22:54:01,987 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-04-02 22:54:02,045 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-02 22:54:02,045 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:54:02,047 INFO L262 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 39 conjunts are in the unsatisfiable core [2023-04-02 22:54:02,049 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:54:02,307 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 17 proven. 9 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2023-04-02 22:54:02,307 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:54:02,410 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:54:02,410 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [239763252] [2023-04-02 22:54:02,410 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:54:02,410 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [675166152] [2023-04-02 22:54:02,410 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [675166152] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:54:02,410 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [606614522] [2023-04-02 22:54:02,414 INFO L159 IcfgInterpreter]: Started Sifa with 30 locations of interest [2023-04-02 22:54:02,414 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:54:02,415 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:54:02,415 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:54:02,415 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:54:02,436 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:54:07,984 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-04-02 22:54:07,986 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 22:54:07,987 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:54:07,988 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:54:12,827 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3825#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-02 22:54:12,828 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:54:12,828 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-04-02 22:54:12,828 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2023-04-02 22:54:12,828 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [564344519] [2023-04-02 22:54:12,828 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-04-02 22:54:12,828 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-04-02 22:54:12,829 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:54:12,829 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-04-02 22:54:12,829 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=889, Unknown=0, NotChecked=0, Total=1056 [2023-04-02 22:54:12,830 INFO L87 Difference]: Start difference. First operand 93 states and 127 transitions. Second operand has 9 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 5 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) [2023-04-02 22:54:13,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:54:13,044 INFO L93 Difference]: Finished difference Result 125 states and 166 transitions. [2023-04-02 22:54:13,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-04-02 22:54:13,045 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 5 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) Word has length 67 [2023-04-02 22:54:13,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:54:13,046 INFO L225 Difference]: With dead ends: 125 [2023-04-02 22:54:13,046 INFO L226 Difference]: Without dead ends: 123 [2023-04-02 22:54:13,047 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 248 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=181, Invalid=1009, Unknown=0, NotChecked=0, Total=1190 [2023-04-02 22:54:13,048 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 27 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 208 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 219 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 208 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 22:54:13,048 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 124 Invalid, 219 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 208 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 22:54:13,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2023-04-02 22:54:13,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 120. [2023-04-02 22:54:13,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 64 states have (on average 1.171875) internal successors, (75), 66 states have internal predecessors, (75), 44 states have call successors, (44), 12 states have call predecessors, (44), 11 states have return successors, (42), 41 states have call predecessors, (42), 42 states have call successors, (42) [2023-04-02 22:54:13,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 161 transitions. [2023-04-02 22:54:13,083 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 161 transitions. Word has length 67 [2023-04-02 22:54:13,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:54:13,084 INFO L495 AbstractCegarLoop]: Abstraction has 120 states and 161 transitions. [2023-04-02 22:54:13,084 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 5 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) [2023-04-02 22:54:13,084 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 161 transitions. [2023-04-02 22:54:13,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2023-04-02 22:54:13,085 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:54:13,085 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:54:13,091 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-04-02 22:54:13,291 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:54:13,291 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:54:13,291 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:54:13,291 INFO L85 PathProgramCache]: Analyzing trace with hash 24066761, now seen corresponding path program 3 times [2023-04-02 22:54:13,291 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:54:13,291 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [652743934] [2023-04-02 22:54:13,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:54:13,292 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:54:13,300 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:54:13,300 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1153623441] [2023-04-02 22:54:13,300 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 22:54:13,301 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:54:13,301 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:54:13,305 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) [2023-04-02 22:54:13,308 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-04-02 22:54:13,366 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 22:54:13,366 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:54:13,367 INFO L262 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 51 conjunts are in the unsatisfiable core [2023-04-02 22:54:13,370 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:54:14,161 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 29 proven. 30 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2023-04-02 22:54:14,162 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:54:14,252 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:54:14,253 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [652743934] [2023-04-02 22:54:14,253 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:54:14,253 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1153623441] [2023-04-02 22:54:14,253 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1153623441] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:54:14,253 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2110907912] [2023-04-02 22:54:14,255 INFO L159 IcfgInterpreter]: Started Sifa with 30 locations of interest [2023-04-02 22:54:14,255 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:54:14,255 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:54:14,255 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:54:14,256 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:54:14,268 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:54:19,273 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-04-02 22:54:19,275 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 22:54:19,276 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:54:19,278 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:54:24,190 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4479#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-02 22:54:24,190 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:54:24,190 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-04-02 22:54:24,190 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2023-04-02 22:54:24,194 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1051616784] [2023-04-02 22:54:24,194 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-04-02 22:54:24,195 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-04-02 22:54:24,195 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:54:24,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-04-02 22:54:24,196 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=1070, Unknown=0, NotChecked=0, Total=1260 [2023-04-02 22:54:24,196 INFO L87 Difference]: Start difference. First operand 120 states and 161 transitions. Second operand has 14 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 10 states have internal predecessors, (23), 7 states have call successors, (16), 2 states have call predecessors, (16), 3 states have return successors, (14), 6 states have call predecessors, (14), 7 states have call successors, (14) [2023-04-02 22:54:24,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:54:24,650 INFO L93 Difference]: Finished difference Result 129 states and 169 transitions. [2023-04-02 22:54:24,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-04-02 22:54:24,651 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 10 states have internal predecessors, (23), 7 states have call successors, (16), 2 states have call predecessors, (16), 3 states have return successors, (14), 6 states have call predecessors, (14), 7 states have call successors, (14) Word has length 72 [2023-04-02 22:54:24,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:54:24,652 INFO L225 Difference]: With dead ends: 129 [2023-04-02 22:54:24,652 INFO L226 Difference]: Without dead ends: 127 [2023-04-02 22:54:24,653 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 114 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 349 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=206, Invalid=1200, Unknown=0, NotChecked=0, Total=1406 [2023-04-02 22:54:24,653 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 43 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 297 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 314 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 297 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-02 22:54:24,653 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 110 Invalid, 314 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 297 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-02 22:54:24,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2023-04-02 22:54:24,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 124. [2023-04-02 22:54:24,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 67 states have (on average 1.164179104477612) internal successors, (78), 69 states have internal predecessors, (78), 44 states have call successors, (44), 13 states have call predecessors, (44), 12 states have return successors, (42), 41 states have call predecessors, (42), 42 states have call successors, (42) [2023-04-02 22:54:24,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 164 transitions. [2023-04-02 22:54:24,684 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 164 transitions. Word has length 72 [2023-04-02 22:54:24,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:54:24,684 INFO L495 AbstractCegarLoop]: Abstraction has 124 states and 164 transitions. [2023-04-02 22:54:24,684 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 10 states have internal predecessors, (23), 7 states have call successors, (16), 2 states have call predecessors, (16), 3 states have return successors, (14), 6 states have call predecessors, (14), 7 states have call successors, (14) [2023-04-02 22:54:24,684 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 164 transitions. [2023-04-02 22:54:24,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2023-04-02 22:54:24,685 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:54:24,685 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:54:24,690 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-04-02 22:54:24,889 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-04-02 22:54:24,889 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:54:24,889 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:54:24,889 INFO L85 PathProgramCache]: Analyzing trace with hash -1114380903, now seen corresponding path program 1 times [2023-04-02 22:54:24,890 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:54:24,890 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1105819013] [2023-04-02 22:54:24,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:54:24,890 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:54:24,898 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:54:24,898 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [50852085] [2023-04-02 22:54:24,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:54:24,898 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:54:24,898 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:54:24,899 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) [2023-04-02 22:54:24,921 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-04-02 22:54:24,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:54:24,959 INFO L262 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 43 conjunts are in the unsatisfiable core [2023-04-02 22:54:24,961 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:54:25,331 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 18 proven. 11 refuted. 0 times theorem prover too weak. 137 trivial. 0 not checked. [2023-04-02 22:54:25,331 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:54:25,924 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2023-04-02 22:54:25,925 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:54:25,925 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1105819013] [2023-04-02 22:54:25,925 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:54:25,925 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [50852085] [2023-04-02 22:54:25,925 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [50852085] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:54:25,925 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [79549201] [2023-04-02 22:54:25,926 INFO L159 IcfgInterpreter]: Started Sifa with 31 locations of interest [2023-04-02 22:54:25,926 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:54:25,927 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:54:25,927 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:54:25,928 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:54:25,937 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:54:30,273 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2023-04-02 22:54:30,276 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 22:54:30,276 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:54:30,278 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:54:32,994 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5383#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:54:32,994 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:54:32,994 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:54:32,994 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 20 [2023-04-02 22:54:32,994 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1787851578] [2023-04-02 22:54:32,994 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 22:54:32,994 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-04-02 22:54:32,995 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:54:32,995 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-04-02 22:54:32,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=215, Invalid=1345, Unknown=0, NotChecked=0, Total=1560 [2023-04-02 22:54:32,996 INFO L87 Difference]: Start difference. First operand 124 states and 164 transitions. Second operand has 20 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 10 states have call successors, (29), 3 states have call predecessors, (29), 2 states have return successors, (27), 8 states have call predecessors, (27), 8 states have call successors, (27) [2023-04-02 22:54:40,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:54:40,755 INFO L93 Difference]: Finished difference Result 209 states and 296 transitions. [2023-04-02 22:54:40,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2023-04-02 22:54:40,756 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 10 states have call successors, (29), 3 states have call predecessors, (29), 2 states have return successors, (27), 8 states have call predecessors, (27), 8 states have call successors, (27) Word has length 78 [2023-04-02 22:54:40,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:54:40,758 INFO L225 Difference]: With dead ends: 209 [2023-04-02 22:54:40,758 INFO L226 Difference]: Without dead ends: 205 [2023-04-02 22:54:40,759 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 195 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 907 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=464, Invalid=3076, Unknown=0, NotChecked=0, Total=3540 [2023-04-02 22:54:40,760 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 92 mSDsluCounter, 234 mSDsCounter, 0 mSdLazyCounter, 695 mSolverCounterSat, 106 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 280 SdHoareTripleChecker+Invalid, 801 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 106 IncrementalHoareTripleChecker+Valid, 695 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2023-04-02 22:54:40,760 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [96 Valid, 280 Invalid, 801 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [106 Valid, 695 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2023-04-02 22:54:40,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2023-04-02 22:54:40,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 201. [2023-04-02 22:54:40,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 104 states have (on average 1.2019230769230769) internal successors, (125), 105 states have internal predecessors, (125), 81 states have call successors, (81), 16 states have call predecessors, (81), 15 states have return successors, (79), 79 states have call predecessors, (79), 79 states have call successors, (79) [2023-04-02 22:54:40,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 285 transitions. [2023-04-02 22:54:40,864 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 285 transitions. Word has length 78 [2023-04-02 22:54:40,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:54:40,865 INFO L495 AbstractCegarLoop]: Abstraction has 201 states and 285 transitions. [2023-04-02 22:54:40,865 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 10 states have call successors, (29), 3 states have call predecessors, (29), 2 states have return successors, (27), 8 states have call predecessors, (27), 8 states have call successors, (27) [2023-04-02 22:54:40,865 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 285 transitions. [2023-04-02 22:54:40,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2023-04-02 22:54:40,866 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:54:40,866 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 6, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:54:40,875 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-04-02 22:54:41,071 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-04-02 22:54:41,072 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:54:41,072 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:54:41,072 INFO L85 PathProgramCache]: Analyzing trace with hash 2003978801, now seen corresponding path program 4 times [2023-04-02 22:54:41,072 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:54:41,072 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [83425204] [2023-04-02 22:54:41,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:54:41,073 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:54:41,080 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:54:41,080 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1062458588] [2023-04-02 22:54:41,081 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 22:54:41,081 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:54:41,081 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:54:41,082 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) [2023-04-02 22:54:41,084 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-04-02 22:54:41,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:54:41,138 INFO L262 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 5 conjunts are in the unsatisfiable core [2023-04-02 22:54:41,139 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:54:41,160 INFO L134 CoverageAnalysis]: Checked inductivity of 251 backedges. 101 proven. 0 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2023-04-02 22:54:41,160 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-02 22:54:41,160 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:54:41,160 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [83425204] [2023-04-02 22:54:41,160 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:54:41,160 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1062458588] [2023-04-02 22:54:41,160 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1062458588] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:54:41,161 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 22:54:41,161 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-02 22:54:41,161 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1375390305] [2023-04-02 22:54:41,161 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:54:41,161 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-02 22:54:41,161 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:54:41,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-02 22:54:41,162 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-02 22:54:41,162 INFO L87 Difference]: Start difference. First operand 201 states and 285 transitions. Second operand has 5 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 3 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2023-04-02 22:54:41,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:54:41,293 INFO L93 Difference]: Finished difference Result 254 states and 357 transitions. [2023-04-02 22:54:41,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-02 22:54:41,293 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 3 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) Word has length 92 [2023-04-02 22:54:41,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:54:41,294 INFO L225 Difference]: With dead ends: 254 [2023-04-02 22:54:41,294 INFO L226 Difference]: Without dead ends: 182 [2023-04-02 22:54:41,296 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-04-02 22:54:41,296 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 7 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:54:41,296 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 137 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:54:41,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2023-04-02 22:54:41,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 168. [2023-04-02 22:54:41,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 87 states have (on average 1.1494252873563218) internal successors, (100), 88 states have internal predecessors, (100), 65 states have call successors, (65), 16 states have call predecessors, (65), 15 states have return successors, (63), 63 states have call predecessors, (63), 63 states have call successors, (63) [2023-04-02 22:54:41,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 228 transitions. [2023-04-02 22:54:41,356 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 228 transitions. Word has length 92 [2023-04-02 22:54:41,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:54:41,356 INFO L495 AbstractCegarLoop]: Abstraction has 168 states and 228 transitions. [2023-04-02 22:54:41,356 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 3 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2023-04-02 22:54:41,357 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 228 transitions. [2023-04-02 22:54:41,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2023-04-02 22:54:41,357 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:54:41,358 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 6, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:54:41,365 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-04-02 22:54:41,563 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-04-02 22:54:41,563 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:54:41,564 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:54:41,564 INFO L85 PathProgramCache]: Analyzing trace with hash -652222968, now seen corresponding path program 1 times [2023-04-02 22:54:41,564 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:54:41,564 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1984977109] [2023-04-02 22:54:41,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:54:41,564 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:54:41,583 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:54:41,583 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [603982974] [2023-04-02 22:54:41,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:54:41,583 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:54:41,584 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:54:41,584 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) [2023-04-02 22:54:41,585 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-04-02 22:54:41,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:54:41,642 INFO L262 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 54 conjunts are in the unsatisfiable core [2023-04-02 22:54:41,644 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:54:42,250 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 53 proven. 22 refuted. 0 times theorem prover too weak. 215 trivial. 0 not checked. [2023-04-02 22:54:42,250 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:54:43,655 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 51 proven. 19 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2023-04-02 22:54:43,656 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:54:43,656 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1984977109] [2023-04-02 22:54:43,656 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:54:43,656 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [603982974] [2023-04-02 22:54:43,656 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [603982974] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:54:43,656 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1593609029] [2023-04-02 22:54:43,658 INFO L159 IcfgInterpreter]: Started Sifa with 30 locations of interest [2023-04-02 22:54:43,658 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:54:43,658 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:54:43,658 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:54:43,658 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:54:43,668 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:54:47,796 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2023-04-02 22:54:47,799 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 22:54:47,800 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:54:47,802 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:54:51,655 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7638#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:54:51,655 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:54:51,656 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:54:51,656 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11] total 21 [2023-04-02 22:54:51,656 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1775354121] [2023-04-02 22:54:51,656 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 22:54:51,656 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-04-02 22:54:51,656 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:54:51,657 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-04-02 22:54:51,657 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=225, Invalid=1335, Unknown=0, NotChecked=0, Total=1560 [2023-04-02 22:54:51,658 INFO L87 Difference]: Start difference. First operand 168 states and 228 transitions. Second operand has 21 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 18 states have internal predecessors, (40), 11 states have call successors, (35), 3 states have call predecessors, (35), 3 states have return successors, (33), 11 states have call predecessors, (33), 10 states have call successors, (33) [2023-04-02 22:55:02,982 WARN L223 SmtUtils]: Spent 9.78s on a formula simplification that was a NOOP. DAG size: 67 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-04-02 22:55:07,522 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.57s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-04-02 22:55:13,426 WARN L223 SmtUtils]: Spent 5.09s on a formula simplification that was a NOOP. DAG size: 57 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-04-02 22:55:15,674 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-04-02 22:55:17,732 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-04-02 22:55:19,515 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.34s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-04-02 22:55:21,547 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-04-02 22:55:23,551 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-04-02 22:55:32,455 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-04-02 22:55:32,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:55:32,479 INFO L93 Difference]: Finished difference Result 210 states and 288 transitions. [2023-04-02 22:55:32,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2023-04-02 22:55:32,479 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 18 states have internal predecessors, (40), 11 states have call successors, (35), 3 states have call predecessors, (35), 3 states have return successors, (33), 11 states have call predecessors, (33), 10 states have call successors, (33) Word has length 94 [2023-04-02 22:55:32,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:55:32,481 INFO L225 Difference]: With dead ends: 210 [2023-04-02 22:55:32,481 INFO L226 Difference]: Without dead ends: 208 [2023-04-02 22:55:32,482 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 243 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 877 ImplicationChecksByTransitivity, 29.6s TimeCoverageRelationStatistics Valid=488, Invalid=2704, Unknown=0, NotChecked=0, Total=3192 [2023-04-02 22:55:32,482 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 94 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 643 mSolverCounterSat, 94 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 15.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 172 SdHoareTripleChecker+Invalid, 742 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 643 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.9s IncrementalHoareTripleChecker+Time [2023-04-02 22:55:32,482 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [103 Valid, 172 Invalid, 742 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 643 Invalid, 5 Unknown, 0 Unchecked, 15.9s Time] [2023-04-02 22:55:32,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2023-04-02 22:55:32,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 198. [2023-04-02 22:55:32,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 198 states, 104 states have (on average 1.1442307692307692) internal successors, (119), 106 states have internal predecessors, (119), 77 states have call successors, (77), 17 states have call predecessors, (77), 16 states have return successors, (75), 74 states have call predecessors, (75), 75 states have call successors, (75) [2023-04-02 22:55:32,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 271 transitions. [2023-04-02 22:55:32,583 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 271 transitions. Word has length 94 [2023-04-02 22:55:32,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:55:32,583 INFO L495 AbstractCegarLoop]: Abstraction has 198 states and 271 transitions. [2023-04-02 22:55:32,583 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 18 states have internal predecessors, (40), 11 states have call successors, (35), 3 states have call predecessors, (35), 3 states have return successors, (33), 11 states have call predecessors, (33), 10 states have call successors, (33) [2023-04-02 22:55:32,583 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 271 transitions. [2023-04-02 22:55:32,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2023-04-02 22:55:32,585 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:55:32,585 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:55:32,590 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2023-04-02 22:55:32,789 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-04-02 22:55:32,790 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:55:32,790 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:55:32,790 INFO L85 PathProgramCache]: Analyzing trace with hash -752375235, now seen corresponding path program 2 times [2023-04-02 22:55:32,790 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:55:32,790 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [861175690] [2023-04-02 22:55:32,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:55:32,791 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:55:32,805 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:55:32,806 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2030666984] [2023-04-02 22:55:32,806 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:55:32,806 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:55:32,806 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:55:32,807 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) [2023-04-02 22:55:32,808 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-04-02 22:55:32,881 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-02 22:55:32,882 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:55:32,883 INFO L262 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 46 conjunts are in the unsatisfiable core [2023-04-02 22:55:32,885 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:55:33,310 INFO L134 CoverageAnalysis]: Checked inductivity of 454 backedges. 33 proven. 32 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2023-04-02 22:55:33,310 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:55:34,758 INFO L134 CoverageAnalysis]: Checked inductivity of 454 backedges. 28 proven. 32 refuted. 0 times theorem prover too weak. 394 trivial. 0 not checked. [2023-04-02 22:55:34,759 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:55:34,759 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [861175690] [2023-04-02 22:55:34,759 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:55:34,759 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2030666984] [2023-04-02 22:55:34,759 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2030666984] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:55:34,759 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1030069707] [2023-04-02 22:55:34,760 INFO L159 IcfgInterpreter]: Started Sifa with 30 locations of interest [2023-04-02 22:55:34,761 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:55:34,761 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:55:34,761 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:55:34,761 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:55:34,770 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:55:38,761 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2023-04-02 22:55:38,764 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 22:55:38,765 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:55:38,767 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:55:40,607 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9027#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:55:40,607 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:55:40,607 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:55:40,607 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 21 [2023-04-02 22:55:40,608 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294858872] [2023-04-02 22:55:40,608 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 22:55:40,608 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-04-02 22:55:40,608 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:55:40,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-04-02 22:55:40,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=1349, Unknown=0, NotChecked=0, Total=1560 [2023-04-02 22:55:40,609 INFO L87 Difference]: Start difference. First operand 198 states and 271 transitions. Second operand has 21 states, 20 states have (on average 1.95) internal successors, (39), 19 states have internal predecessors, (39), 11 states have call successors, (40), 3 states have call predecessors, (40), 2 states have return successors, (37), 11 states have call predecessors, (37), 11 states have call successors, (37) [2023-04-02 22:55:55,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:55:55,452 INFO L93 Difference]: Finished difference Result 322 states and 466 transitions. [2023-04-02 22:55:55,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2023-04-02 22:55:55,452 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.95) internal successors, (39), 19 states have internal predecessors, (39), 11 states have call successors, (40), 3 states have call predecessors, (40), 2 states have return successors, (37), 11 states have call predecessors, (37), 11 states have call successors, (37) Word has length 111 [2023-04-02 22:55:55,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:55:55,455 INFO L225 Difference]: With dead ends: 322 [2023-04-02 22:55:55,455 INFO L226 Difference]: Without dead ends: 320 [2023-04-02 22:55:55,456 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 294 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1112 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=635, Invalid=3787, Unknown=0, NotChecked=0, Total=4422 [2023-04-02 22:55:55,457 INFO L413 NwaCegarLoop]: 60 mSDtfsCounter, 96 mSDsluCounter, 242 mSDsCounter, 0 mSdLazyCounter, 898 mSolverCounterSat, 137 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 302 SdHoareTripleChecker+Invalid, 1035 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 137 IncrementalHoareTripleChecker+Valid, 898 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.4s IncrementalHoareTripleChecker+Time [2023-04-02 22:55:55,457 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [100 Valid, 302 Invalid, 1035 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [137 Valid, 898 Invalid, 0 Unknown, 0 Unchecked, 6.4s Time] [2023-04-02 22:55:55,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 320 states. [2023-04-02 22:55:55,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 320 to 285. [2023-04-02 22:55:55,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 285 states, 144 states have (on average 1.1805555555555556) internal successors, (170), 146 states have internal predecessors, (170), 121 states have call successors, (121), 20 states have call predecessors, (121), 19 states have return successors, (119), 118 states have call predecessors, (119), 119 states have call successors, (119) [2023-04-02 22:55:55,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 285 states to 285 states and 410 transitions. [2023-04-02 22:55:55,633 INFO L78 Accepts]: Start accepts. Automaton has 285 states and 410 transitions. Word has length 111 [2023-04-02 22:55:55,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:55:55,633 INFO L495 AbstractCegarLoop]: Abstraction has 285 states and 410 transitions. [2023-04-02 22:55:55,634 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 1.95) internal successors, (39), 19 states have internal predecessors, (39), 11 states have call successors, (40), 3 states have call predecessors, (40), 2 states have return successors, (37), 11 states have call predecessors, (37), 11 states have call successors, (37) [2023-04-02 22:55:55,634 INFO L276 IsEmpty]: Start isEmpty. Operand 285 states and 410 transitions. [2023-04-02 22:55:55,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2023-04-02 22:55:55,635 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:55:55,635 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:55:55,641 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2023-04-02 22:55:55,842 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:55:55,842 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:55:55,842 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:55:55,842 INFO L85 PathProgramCache]: Analyzing trace with hash -1401725166, now seen corresponding path program 3 times [2023-04-02 22:55:55,842 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:55:55,843 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1730256064] [2023-04-02 22:55:55,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:55:55,843 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:55:55,853 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:55:55,853 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1990037140] [2023-04-02 22:55:55,853 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 22:55:55,853 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:55:55,853 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:55:55,854 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) [2023-04-02 22:55:55,857 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-04-02 22:55:55,918 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 22:55:55,918 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:55:55,919 INFO L262 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 59 conjunts are in the unsatisfiable core [2023-04-02 22:55:55,921 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:55:56,490 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 30 proven. 40 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2023-04-02 22:55:56,490 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:55:57,408 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 36 proven. 29 refuted. 0 times theorem prover too weak. 394 trivial. 0 not checked. [2023-04-02 22:55:57,408 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:55:57,409 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1730256064] [2023-04-02 22:55:57,409 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:55:57,409 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1990037140] [2023-04-02 22:55:57,409 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1990037140] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:55:57,409 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [49430786] [2023-04-02 22:55:57,410 INFO L159 IcfgInterpreter]: Started Sifa with 30 locations of interest [2023-04-02 22:55:57,410 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:55:57,411 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:55:57,411 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:55:57,411 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:55:57,420 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:56:01,554 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2023-04-02 22:56:01,557 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 22:56:01,558 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:56:01,560 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:56:03,426 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10793#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:56:03,426 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:56:03,426 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:56:03,426 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 24 [2023-04-02 22:56:03,426 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929572248] [2023-04-02 22:56:03,426 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 22:56:03,427 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-04-02 22:56:03,427 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:56:03,427 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-04-02 22:56:03,428 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=1572, Unknown=0, NotChecked=0, Total=1806 [2023-04-02 22:56:03,428 INFO L87 Difference]: Start difference. First operand 285 states and 410 transitions. Second operand has 24 states, 23 states have (on average 1.9565217391304348) internal successors, (45), 21 states have internal predecessors, (45), 12 states have call successors, (41), 3 states have call predecessors, (41), 2 states have return successors, (39), 12 states have call predecessors, (39), 12 states have call successors, (39) [2023-04-02 22:56:13,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:56:13,367 INFO L93 Difference]: Finished difference Result 422 states and 615 transitions. [2023-04-02 22:56:13,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2023-04-02 22:56:13,368 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 1.9565217391304348) internal successors, (45), 21 states have internal predecessors, (45), 12 states have call successors, (41), 3 states have call predecessors, (41), 2 states have return successors, (39), 12 states have call predecessors, (39), 12 states have call successors, (39) Word has length 114 [2023-04-02 22:56:13,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:56:13,370 INFO L225 Difference]: With dead ends: 422 [2023-04-02 22:56:13,370 INFO L226 Difference]: Without dead ends: 420 [2023-04-02 22:56:13,372 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 362 GetRequests, 300 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1084 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=557, Invalid=3475, Unknown=0, NotChecked=0, Total=4032 [2023-04-02 22:56:13,372 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 115 mSDsluCounter, 202 mSDsCounter, 0 mSdLazyCounter, 722 mSolverCounterSat, 166 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 246 SdHoareTripleChecker+Invalid, 888 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 166 IncrementalHoareTripleChecker+Valid, 722 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2023-04-02 22:56:13,372 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [119 Valid, 246 Invalid, 888 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [166 Valid, 722 Invalid, 0 Unknown, 0 Unchecked, 4.4s Time] [2023-04-02 22:56:13,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 420 states. [2023-04-02 22:56:13,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 420 to 394. [2023-04-02 22:56:13,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 394 states, 200 states have (on average 1.185) internal successors, (237), 203 states have internal predecessors, (237), 169 states have call successors, (169), 25 states have call predecessors, (169), 24 states have return successors, (167), 165 states have call predecessors, (167), 167 states have call successors, (167) [2023-04-02 22:56:13,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 394 states to 394 states and 573 transitions. [2023-04-02 22:56:13,668 INFO L78 Accepts]: Start accepts. Automaton has 394 states and 573 transitions. Word has length 114 [2023-04-02 22:56:13,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:56:13,669 INFO L495 AbstractCegarLoop]: Abstraction has 394 states and 573 transitions. [2023-04-02 22:56:13,669 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 1.9565217391304348) internal successors, (45), 21 states have internal predecessors, (45), 12 states have call successors, (41), 3 states have call predecessors, (41), 2 states have return successors, (39), 12 states have call predecessors, (39), 12 states have call successors, (39) [2023-04-02 22:56:13,669 INFO L276 IsEmpty]: Start isEmpty. Operand 394 states and 573 transitions. [2023-04-02 22:56:13,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2023-04-02 22:56:13,671 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:56:13,671 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:56:13,679 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2023-04-02 22:56:13,876 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-04-02 22:56:13,877 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:56:13,877 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:56:13,877 INFO L85 PathProgramCache]: Analyzing trace with hash 1869127778, now seen corresponding path program 2 times [2023-04-02 22:56:13,877 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:56:13,877 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1610693910] [2023-04-02 22:56:13,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:56:13,877 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:56:13,886 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:56:13,886 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [258731851] [2023-04-02 22:56:13,886 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:56:13,886 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:56:13,886 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:56:13,893 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) [2023-04-02 22:56:13,895 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-04-02 22:56:13,957 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-02 22:56:13,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:56:13,958 INFO L262 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 71 conjunts are in the unsatisfiable core [2023-04-02 22:56:13,961 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:56:14,466 INFO L134 CoverageAnalysis]: Checked inductivity of 585 backedges. 110 proven. 54 refuted. 0 times theorem prover too weak. 421 trivial. 0 not checked. [2023-04-02 22:56:14,466 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:56:16,743 INFO L134 CoverageAnalysis]: Checked inductivity of 585 backedges. 105 proven. 54 refuted. 0 times theorem prover too weak. 426 trivial. 0 not checked. [2023-04-02 22:56:16,744 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:56:16,744 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1610693910] [2023-04-02 22:56:16,744 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:56:16,744 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [258731851] [2023-04-02 22:56:16,744 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [258731851] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:56:16,744 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2034671129] [2023-04-02 22:56:16,745 INFO L159 IcfgInterpreter]: Started Sifa with 31 locations of interest [2023-04-02 22:56:16,745 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:56:16,746 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:56:16,746 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:56:16,746 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:56:16,756 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:56:20,886 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2023-04-02 22:56:20,889 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 22:56:20,889 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:56:20,891 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:56:24,708 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12965#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:56:24,708 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:56:24,708 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:56:24,708 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15] total 29 [2023-04-02 22:56:24,709 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387361006] [2023-04-02 22:56:24,709 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 22:56:24,709 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-04-02 22:56:24,709 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:56:24,710 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-04-02 22:56:24,710 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=2070, Unknown=0, NotChecked=0, Total=2352 [2023-04-02 22:56:24,711 INFO L87 Difference]: Start difference. First operand 394 states and 573 transitions. Second operand has 29 states, 24 states have (on average 2.1666666666666665) internal successors, (52), 26 states have internal predecessors, (52), 17 states have call successors, (44), 3 states have call predecessors, (44), 3 states have return successors, (41), 13 states have call predecessors, (41), 15 states have call successors, (41) [2023-04-02 22:56:30,540 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-04-02 22:56:34,429 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-04-02 22:56:38,020 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 3.31s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-04-02 22:56:40,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:56:40,534 INFO L93 Difference]: Finished difference Result 439 states and 627 transitions. [2023-04-02 22:56:40,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2023-04-02 22:56:40,535 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 24 states have (on average 2.1666666666666665) internal successors, (52), 26 states have internal predecessors, (52), 17 states have call successors, (44), 3 states have call predecessors, (44), 3 states have return successors, (41), 13 states have call predecessors, (41), 15 states have call successors, (41) Word has length 125 [2023-04-02 22:56:40,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:56:40,537 INFO L225 Difference]: With dead ends: 439 [2023-04-02 22:56:40,538 INFO L226 Difference]: Without dead ends: 431 [2023-04-02 22:56:40,539 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 327 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1393 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=687, Invalid=4569, Unknown=0, NotChecked=0, Total=5256 [2023-04-02 22:56:40,540 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 80 mSDsluCounter, 296 mSDsCounter, 0 mSdLazyCounter, 1389 mSolverCounterSat, 121 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 344 SdHoareTripleChecker+Invalid, 1513 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 121 IncrementalHoareTripleChecker+Valid, 1389 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.3s IncrementalHoareTripleChecker+Time [2023-04-02 22:56:40,540 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [83 Valid, 344 Invalid, 1513 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [121 Valid, 1389 Invalid, 3 Unknown, 0 Unchecked, 11.3s Time] [2023-04-02 22:56:40,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 431 states. [2023-04-02 22:56:40,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 431 to 399. [2023-04-02 22:56:40,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 399 states, 199 states have (on average 1.150753768844221) internal successors, (229), 201 states have internal predecessors, (229), 172 states have call successors, (172), 28 states have call predecessors, (172), 27 states have return successors, (171), 169 states have call predecessors, (171), 171 states have call successors, (171) [2023-04-02 22:56:40,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 399 states to 399 states and 572 transitions. [2023-04-02 22:56:40,891 INFO L78 Accepts]: Start accepts. Automaton has 399 states and 572 transitions. Word has length 125 [2023-04-02 22:56:40,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:56:40,892 INFO L495 AbstractCegarLoop]: Abstraction has 399 states and 572 transitions. [2023-04-02 22:56:40,892 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 24 states have (on average 2.1666666666666665) internal successors, (52), 26 states have internal predecessors, (52), 17 states have call successors, (44), 3 states have call predecessors, (44), 3 states have return successors, (41), 13 states have call predecessors, (41), 15 states have call successors, (41) [2023-04-02 22:56:40,892 INFO L276 IsEmpty]: Start isEmpty. Operand 399 states and 572 transitions. [2023-04-02 22:56:40,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2023-04-02 22:56:40,895 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:56:40,895 INFO L195 NwaCegarLoop]: trace histogram [20, 19, 19, 6, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:56:40,902 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2023-04-02 22:56:41,100 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-04-02 22:56:41,101 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:56:41,101 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:56:41,101 INFO L85 PathProgramCache]: Analyzing trace with hash 597681873, now seen corresponding path program 4 times [2023-04-02 22:56:41,101 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:56:41,101 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [47953549] [2023-04-02 22:56:41,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:56:41,102 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:56:41,113 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:56:41,114 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1473333994] [2023-04-02 22:56:41,114 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 22:56:41,114 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:56:41,114 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:56:41,115 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) [2023-04-02 22:56:41,116 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-04-02 22:56:41,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:56:41,205 INFO L262 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 77 conjunts are in the unsatisfiable core [2023-04-02 22:56:41,208 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:56:43,164 INFO L134 CoverageAnalysis]: Checked inductivity of 815 backedges. 93 proven. 70 refuted. 0 times theorem prover too weak. 652 trivial. 0 not checked. [2023-04-02 22:56:43,164 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:56:43,659 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:56:43,659 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [47953549] [2023-04-02 22:56:43,659 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:56:43,659 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1473333994] [2023-04-02 22:56:43,659 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1473333994] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:56:43,659 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1642717457] [2023-04-02 22:56:43,661 INFO L159 IcfgInterpreter]: Started Sifa with 30 locations of interest [2023-04-02 22:56:43,661 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:56:43,661 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:56:43,661 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:56:43,661 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:56:43,670 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:56:47,900 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2023-04-02 22:56:47,903 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 22:56:47,903 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:56:47,905 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:56:52,203 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14919#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:56:52,204 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:56:52,204 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-04-02 22:56:52,204 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2023-04-02 22:56:52,204 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1043416148] [2023-04-02 22:56:52,204 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-04-02 22:56:52,205 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-04-02 22:56:52,205 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:56:52,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-04-02 22:56:52,206 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=1784, Unknown=0, NotChecked=0, Total=2070 [2023-04-02 22:56:52,206 INFO L87 Difference]: Start difference. First operand 399 states and 572 transitions. Second operand has 20 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 16 states have internal predecessors, (32), 10 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (26), 10 states have call predecessors, (26), 9 states have call successors, (26) [2023-04-02 22:56:55,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:56:55,286 INFO L93 Difference]: Finished difference Result 420 states and 590 transitions. [2023-04-02 22:56:55,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-04-02 22:56:55,286 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 16 states have internal predecessors, (32), 10 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (26), 10 states have call predecessors, (26), 9 states have call successors, (26) Word has length 141 [2023-04-02 22:56:55,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:56:55,288 INFO L225 Difference]: With dead ends: 420 [2023-04-02 22:56:55,288 INFO L226 Difference]: Without dead ends: 418 [2023-04-02 22:56:55,289 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 262 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 776 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=368, Invalid=2494, Unknown=0, NotChecked=0, Total=2862 [2023-04-02 22:56:55,289 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 54 mSDsluCounter, 190 mSDsCounter, 0 mSdLazyCounter, 1048 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 235 SdHoareTripleChecker+Invalid, 1088 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 1048 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:56:55,290 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 235 Invalid, 1088 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 1048 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2023-04-02 22:56:55,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 418 states. [2023-04-02 22:56:55,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 418 to 411. [2023-04-02 22:56:55,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 411 states, 208 states have (on average 1.1442307692307692) internal successors, (238), 210 states have internal predecessors, (238), 172 states have call successors, (172), 31 states have call predecessors, (172), 30 states have return successors, (171), 169 states have call predecessors, (171), 171 states have call successors, (171) [2023-04-02 22:56:55,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 411 states to 411 states and 581 transitions. [2023-04-02 22:56:55,723 INFO L78 Accepts]: Start accepts. Automaton has 411 states and 581 transitions. Word has length 141 [2023-04-02 22:56:55,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:56:55,723 INFO L495 AbstractCegarLoop]: Abstraction has 411 states and 581 transitions. [2023-04-02 22:56:55,724 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 16 states have internal predecessors, (32), 10 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (26), 10 states have call predecessors, (26), 9 states have call successors, (26) [2023-04-02 22:56:55,724 INFO L276 IsEmpty]: Start isEmpty. Operand 411 states and 581 transitions. [2023-04-02 22:56:55,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2023-04-02 22:56:55,726 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:56:55,726 INFO L195 NwaCegarLoop]: trace histogram [24, 23, 23, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:56:55,731 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2023-04-02 22:56:55,926 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-04-02 22:56:55,926 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:56:55,927 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:56:55,927 INFO L85 PathProgramCache]: Analyzing trace with hash -606841840, now seen corresponding path program 5 times [2023-04-02 22:56:55,927 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:56:55,927 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [747766253] [2023-04-02 22:56:55,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:56:55,927 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:56:55,935 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:56:55,935 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1632550938] [2023-04-02 22:56:55,935 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:56:55,935 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:56:55,935 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:56:55,936 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) [2023-04-02 22:56:55,937 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-04-02 22:56:56,249 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-02 22:56:56,249 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:56:56,251 INFO L262 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 78 conjunts are in the unsatisfiable core [2023-04-02 22:56:56,255 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:56:58,131 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 166 proven. 88 refuted. 0 times theorem prover too weak. 926 trivial. 0 not checked. [2023-04-02 22:56:58,131 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:57:03,725 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:57:03,725 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [747766253] [2023-04-02 22:57:03,725 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:57:03,725 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1632550938] [2023-04-02 22:57:03,725 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1632550938] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:57:03,725 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1211419096] [2023-04-02 22:57:03,726 INFO L159 IcfgInterpreter]: Started Sifa with 30 locations of interest [2023-04-02 22:57:03,726 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:57:03,726 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:57:03,726 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:57:03,726 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:57:03,735 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:57:07,657 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2023-04-02 22:57:07,659 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 9 for LOIs [2023-04-02 22:57:07,660 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:57:07,662 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:57:12,347 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16953#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:57:12,348 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:57:12,348 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-04-02 22:57:12,348 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2023-04-02 22:57:12,348 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648976499] [2023-04-02 22:57:12,348 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-04-02 22:57:12,348 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-04-02 22:57:12,348 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:57:12,349 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-04-02 22:57:12,349 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=283, Invalid=1697, Unknown=0, NotChecked=0, Total=1980 [2023-04-02 22:57:12,350 INFO L87 Difference]: Start difference. First operand 411 states and 581 transitions. Second operand has 17 states, 16 states have (on average 1.9375) internal successors, (31), 14 states have internal predecessors, (31), 8 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (22), 7 states have call predecessors, (22), 8 states have call successors, (22) [2023-04-02 22:57:13,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:57:13,640 INFO L93 Difference]: Finished difference Result 467 states and 650 transitions. [2023-04-02 22:57:13,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-04-02 22:57:13,641 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.9375) internal successors, (31), 14 states have internal predecessors, (31), 8 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (22), 7 states have call predecessors, (22), 8 states have call successors, (22) Word has length 163 [2023-04-02 22:57:13,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:57:13,643 INFO L225 Difference]: With dead ends: 467 [2023-04-02 22:57:13,643 INFO L226 Difference]: Without dead ends: 465 [2023-04-02 22:57:13,644 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 329 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 741 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=353, Invalid=2197, Unknown=0, NotChecked=0, Total=2550 [2023-04-02 22:57:13,645 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 32 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 677 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 178 SdHoareTripleChecker+Invalid, 714 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 677 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-04-02 22:57:13,645 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 178 Invalid, 714 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 677 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-04-02 22:57:13,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 465 states. [2023-04-02 22:57:14,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 465 to 460. [2023-04-02 22:57:14,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 460 states, 236 states have (on average 1.1355932203389831) internal successors, (268), 239 states have internal predecessors, (268), 188 states have call successors, (188), 36 states have call predecessors, (188), 35 states have return successors, (187), 184 states have call predecessors, (187), 187 states have call successors, (187) [2023-04-02 22:57:14,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 460 states to 460 states and 643 transitions. [2023-04-02 22:57:14,019 INFO L78 Accepts]: Start accepts. Automaton has 460 states and 643 transitions. Word has length 163 [2023-04-02 22:57:14,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:57:14,019 INFO L495 AbstractCegarLoop]: Abstraction has 460 states and 643 transitions. [2023-04-02 22:57:14,019 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 1.9375) internal successors, (31), 14 states have internal predecessors, (31), 8 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (22), 7 states have call predecessors, (22), 8 states have call successors, (22) [2023-04-02 22:57:14,020 INFO L276 IsEmpty]: Start isEmpty. Operand 460 states and 643 transitions. [2023-04-02 22:57:14,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2023-04-02 22:57:14,022 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:57:14,022 INFO L195 NwaCegarLoop]: trace histogram [24, 23, 23, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:57:14,029 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2023-04-02 22:57:14,228 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-04-02 22:57:14,229 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:57:14,229 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:57:14,229 INFO L85 PathProgramCache]: Analyzing trace with hash 951139241, now seen corresponding path program 6 times [2023-04-02 22:57:14,229 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:57:14,229 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [502009614] [2023-04-02 22:57:14,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:57:14,229 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:57:14,242 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:57:14,242 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [121427096] [2023-04-02 22:57:14,242 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 22:57:14,242 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:57:14,242 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:57:14,243 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) [2023-04-02 22:57:14,247 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-04-02 22:57:14,353 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 22:57:14,353 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:57:14,356 INFO L262 TraceCheckSpWp]: Trace formula consists of 376 conjuncts, 110 conjunts are in the unsatisfiable core [2023-04-02 22:57:14,359 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:57:16,455 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 213 proven. 121 refuted. 0 times theorem prover too weak. 854 trivial. 0 not checked. [2023-04-02 22:57:16,455 INFO L327 TraceCheckSpWp]: Computing backward predicates...