/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/divbin2_unwindbound50.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 14:28:43,503 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 14:28:43,504 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 14:28:43,534 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 14:28:43,534 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 14:28:43,537 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 14:28:43,539 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 14:28:43,543 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 14:28:43,544 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 14:28:43,548 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 14:28:43,548 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 14:28:43,549 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 14:28:43,550 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 14:28:43,551 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 14:28:43,552 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 14:28:43,553 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 14:28:43,555 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 14:28:43,556 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 14:28:43,557 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 14:28:43,561 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 14:28:43,564 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 14:28:43,564 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 14:28:43,565 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 14:28:43,567 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 14:28:43,571 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-05-02 14:28:43,572 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-05-02 14:28:43,572 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-05-02 14:28:43,573 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-05-02 14:28:43,573 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-05-02 14:28:43,574 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-05-02 14:28:43,574 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-05-02 14:28:43,575 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-05-02 14:28:43,576 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-05-02 14:28:43,576 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-05-02 14:28:43,577 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-05-02 14:28:43,577 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-05-02 14:28:43,578 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-05-02 14:28:43,578 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-05-02 14:28:43,578 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 14:28:43,578 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 14:28:43,579 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 14:28:43,582 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-02 14:28:43,615 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 14:28:43,615 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 14:28:43,617 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 14:28:43,617 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 14:28:43,618 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 14:28:43,618 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 14:28:43,618 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 14:28:43,618 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 14:28:43,618 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 14:28:43,618 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 14:28:43,619 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 14:28:43,619 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 14:28:43,619 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 14:28:43,619 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 14:28:43,619 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 14:28:43,620 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 14:28:43,620 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 14:28:43,620 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 14:28:43,620 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 14:28:43,620 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 14:28:43,620 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 14:28:43,621 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 14:28:43,621 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 14:28:43,621 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 14:28:43,621 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 14:28:43,621 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 14:28:43,621 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 14:28:43,621 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 14:28:43,621 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 14:28:43,889 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 14:28:43,903 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 14:28:43,905 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 14:28:43,906 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 14:28:43,906 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 14:28:43,907 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/divbin2_unwindbound50.i [2021-05-02 14:28:43,954 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/36b2347be/fcf67dfa59264784a293ea3e7fddfc5b/FLAGc0a66c299 [2021-05-02 14:28:44,291 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 14:28:44,291 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/divbin2_unwindbound50.i [2021-05-02 14:28:44,296 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/36b2347be/fcf67dfa59264784a293ea3e7fddfc5b/FLAGc0a66c299 [2021-05-02 14:28:44,310 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/36b2347be/fcf67dfa59264784a293ea3e7fddfc5b [2021-05-02 14:28:44,312 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 14:28:44,314 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 14:28:44,317 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 14:28:44,317 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 14:28:44,319 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 14:28:44,320 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 02:28:44" (1/1) ... [2021-05-02 14:28:44,321 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@20611893 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:28:44, skipping insertion in model container [2021-05-02 14:28:44,321 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 02:28:44" (1/1) ... [2021-05-02 14:28:44,326 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 14:28:44,337 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 14:28:44,457 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/divbin2_unwindbound50.i[959,972] [2021-05-02 14:28:44,474 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 14:28:44,479 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 14:28:44,522 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/divbin2_unwindbound50.i[959,972] [2021-05-02 14:28:44,534 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 14:28:44,546 INFO L208 MainTranslator]: Completed translation [2021-05-02 14:28:44,547 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:28:44 WrapperNode [2021-05-02 14:28:44,547 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 14:28:44,548 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 14:28:44,548 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 14:28:44,549 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 14:28:44,556 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:28:44" (1/1) ... [2021-05-02 14:28:44,557 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:28:44" (1/1) ... [2021-05-02 14:28:44,562 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:28:44" (1/1) ... [2021-05-02 14:28:44,562 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:28:44" (1/1) ... [2021-05-02 14:28:44,572 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:28:44" (1/1) ... [2021-05-02 14:28:44,575 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:28:44" (1/1) ... [2021-05-02 14:28:44,579 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:28:44" (1/1) ... [2021-05-02 14:28:44,581 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 14:28:44,582 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 14:28:44,582 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 14:28:44,582 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 14:28:44,583 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:28:44" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 14:28:44,649 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 14:28:44,650 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 14:28:44,650 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 14:28:44,650 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 14:28:44,650 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 14:28:44,650 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 14:28:44,650 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 14:28:44,651 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 14:28:44,651 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 14:28:44,651 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 14:28:44,651 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 14:28:44,651 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 14:28:44,652 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_int [2021-05-02 14:28:44,652 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 14:28:44,652 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 14:28:44,652 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 14:28:44,652 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 14:28:44,653 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 14:28:44,653 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 14:28:44,653 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 14:28:44,653 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 14:28:44,653 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 14:28:44,837 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 14:28:44,838 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 14:28:44,838 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 02:28:44 BoogieIcfgContainer [2021-05-02 14:28:44,839 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 14:28:44,840 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 14:28:44,840 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 14:28:44,841 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 14:28:44,842 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 02:28:44" (1/3) ... [2021-05-02 14:28:44,842 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@730b2251 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 02:28:44, skipping insertion in model container [2021-05-02 14:28:44,842 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:28:44" (2/3) ... [2021-05-02 14:28:44,842 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@730b2251 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 02:28:44, skipping insertion in model container [2021-05-02 14:28:44,842 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 02:28:44" (3/3) ... [2021-05-02 14:28:44,843 INFO L111 eAbstractionObserver]: Analyzing ICFG divbin2_unwindbound50.i [2021-05-02 14:28:44,846 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 14:28:44,865 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 14:28:44,876 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 14:28:44,900 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 14:28:44,900 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 14:28:44,900 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 14:28:44,900 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 14:28:44,900 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 14:28:44,900 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 14:28:44,900 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 14:28:44,900 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 14:28:44,910 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 18 states have internal predecessors, (26), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 14:28:44,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 14:28:44,913 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:28:44,913 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:28:44,914 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:28:44,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:28:44,917 INFO L82 PathProgramCache]: Analyzing trace with hash -2126508982, now seen corresponding path program 1 times [2021-05-02 14:28:44,922 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:28:44,922 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1061102351] [2021-05-02 14:28:44,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:28:44,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:28:45,054 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 14:28:45,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:28:45,080 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:28:45,080 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:28:45,080 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1061102351] [2021-05-02 14:28:45,081 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1061102351] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:28:45,081 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:28:45,081 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 14:28:45,081 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [598780832] [2021-05-02 14:28:45,084 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 14:28:45,084 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:28:45,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 14:28:45,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:28:45,093 INFO L87 Difference]: Start difference. First operand has 26 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 18 states have internal predecessors, (26), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 14:28:45,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:28:45,142 INFO L93 Difference]: Finished difference Result 44 states and 60 transitions. [2021-05-02 14:28:45,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 14:28:45,143 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-02 14:28:45,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:28:45,147 INFO L225 Difference]: With dead ends: 44 [2021-05-02 14:28:45,147 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 14:28:45,149 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 42.9ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:28:45,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 14:28:45,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2021-05-02 14:28:45,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:28:45,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 26 transitions. [2021-05-02 14:28:45,171 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 26 transitions. Word has length 12 [2021-05-02 14:28:45,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:28:45,171 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 26 transitions. [2021-05-02 14:28:45,172 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 14:28:45,172 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 26 transitions. [2021-05-02 14:28:45,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 14:28:45,172 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:28:45,172 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:28:45,172 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 14:28:45,173 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:28:45,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:28:45,173 INFO L82 PathProgramCache]: Analyzing trace with hash 941422680, now seen corresponding path program 1 times [2021-05-02 14:28:45,173 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:28:45,173 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [931869343] [2021-05-02 14:28:45,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:28:45,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:28:45,227 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 14:28:45,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:28:45,243 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:28:45,243 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:28:45,244 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [931869343] [2021-05-02 14:28:45,244 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [931869343] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:28:45,244 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:28:45,244 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 14:28:45,244 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140078328] [2021-05-02 14:28:45,245 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 14:28:45,245 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:28:45,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 14:28:45,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 14:28:45,246 INFO L87 Difference]: Start difference. First operand 21 states and 26 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 14:28:45,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:28:45,335 INFO L93 Difference]: Finished difference Result 35 states and 44 transitions. [2021-05-02 14:28:45,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 14:28:45,336 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-02 14:28:45,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:28:45,337 INFO L225 Difference]: With dead ends: 35 [2021-05-02 14:28:45,337 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 14:28:45,338 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 39.2ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:28:45,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 14:28:45,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-05-02 14:28:45,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:28:45,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 28 transitions. [2021-05-02 14:28:45,346 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 28 transitions. Word has length 14 [2021-05-02 14:28:45,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:28:45,347 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 28 transitions. [2021-05-02 14:28:45,347 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 14:28:45,347 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 28 transitions. [2021-05-02 14:28:45,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 14:28:45,348 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:28:45,348 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:28:45,349 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 14:28:45,349 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:28:45,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:28:45,351 INFO L82 PathProgramCache]: Analyzing trace with hash -1209133518, now seen corresponding path program 1 times [2021-05-02 14:28:45,353 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:28:45,353 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1767960144] [2021-05-02 14:28:45,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:28:45,374 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:28:45,375 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1485451537] [2021-05-02 14:28:45,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:28:45,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:28:45,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 14:28:45,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:28:45,467 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:45,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:45,480 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:45,497 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:45,506 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:45,507 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:45,520 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:45,525 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:45,546 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:28:45,546 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:28:45,546 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1767960144] [2021-05-02 14:28:45,547 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:28:45,547 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1485451537] [2021-05-02 14:28:45,547 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1485451537] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:28:45,547 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:28:45,547 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 14:28:45,547 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1910213789] [2021-05-02 14:28:45,547 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 14:28:45,548 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:28:45,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 14:28:45,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 14:28:45,549 INFO L87 Difference]: Start difference. First operand 23 states and 28 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 14:28:45,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:28:45,571 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2021-05-02 14:28:45,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 14:28:45,572 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), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 14:28:45,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:28:45,574 INFO L225 Difference]: With dead ends: 34 [2021-05-02 14:28:45,574 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 14:28:45,574 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 8.0ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 14:28:45,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 14:28:45,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2021-05-02 14:28:45,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 19 states have (on average 1.368421052631579) internal successors, (26), 20 states have internal predecessors, (26), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:28:45,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2021-05-02 14:28:45,583 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 15 [2021-05-02 14:28:45,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:28:45,583 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2021-05-02 14:28:45,583 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 14:28:45,583 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2021-05-02 14:28:45,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 14:28:45,584 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:28:45,584 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:28:45,800 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 14:28:45,801 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:28:45,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:28:45,802 INFO L82 PathProgramCache]: Analyzing trace with hash -1207346058, now seen corresponding path program 1 times [2021-05-02 14:28:45,802 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:28:45,802 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1380115937] [2021-05-02 14:28:45,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:28:45,809 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:28:45,810 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1357781834] [2021-05-02 14:28:45,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:28:45,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:28:45,865 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 14:28:45,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:28:45,912 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:45,914 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:45,926 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:28:45,926 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:28:45,927 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1380115937] [2021-05-02 14:28:45,927 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:28:45,927 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1357781834] [2021-05-02 14:28:45,927 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1357781834] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:28:45,927 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:28:45,927 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 14:28:45,927 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1959915209] [2021-05-02 14:28:45,927 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 14:28:45,927 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:28:45,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 14:28:45,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:28:45,928 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 14:28:45,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:28:45,971 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2021-05-02 14:28:45,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 14:28:45,971 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 14:28:45,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:28:45,973 INFO L225 Difference]: With dead ends: 35 [2021-05-02 14:28:45,973 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 14:28:45,974 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 23.0ms TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 14:28:45,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 14:28:45,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 14:28:45,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 24 states have internal predecessors, (30), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:28:45,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 38 transitions. [2021-05-02 14:28:45,982 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 38 transitions. Word has length 15 [2021-05-02 14:28:45,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:28:45,983 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 38 transitions. [2021-05-02 14:28:45,983 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 14:28:45,983 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 38 transitions. [2021-05-02 14:28:45,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 14:28:45,983 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:28:45,984 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:28:46,200 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:28:46,200 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:28:46,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:28:46,201 INFO L82 PathProgramCache]: Analyzing trace with hash -352921097, now seen corresponding path program 1 times [2021-05-02 14:28:46,201 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:28:46,201 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1438377049] [2021-05-02 14:28:46,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:28:46,209 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:28:46,209 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1864254771] [2021-05-02 14:28:46,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:28:46,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:28:46,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 14:28:46,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:28:46,259 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:46,262 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:46,262 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:46,268 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:46,270 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:46,271 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:46,280 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:46,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:46,292 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:28:46,293 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:28:46,293 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1438377049] [2021-05-02 14:28:46,293 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:28:46,293 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1864254771] [2021-05-02 14:28:46,293 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1864254771] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:28:46,293 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:28:46,293 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-02 14:28:46,293 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [531789400] [2021-05-02 14:28:46,293 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 14:28:46,293 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:28:46,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 14:28:46,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 14:28:46,294 INFO L87 Difference]: Start difference. First operand 32 states and 38 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 14:28:46,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:28:46,311 INFO L93 Difference]: Finished difference Result 46 states and 56 transitions. [2021-05-02 14:28:46,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 14:28:46,312 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 14:28:46,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:28:46,312 INFO L225 Difference]: With dead ends: 46 [2021-05-02 14:28:46,312 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 14:28:46,313 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 10.6ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:28:46,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 14:28:46,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-02 14:28:46,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 25 states have (on average 1.28) internal successors, (32), 26 states have internal predecessors, (32), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:28:46,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2021-05-02 14:28:46,323 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 17 [2021-05-02 14:28:46,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:28:46,323 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2021-05-02 14:28:46,323 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 14:28:46,323 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2021-05-02 14:28:46,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 14:28:46,324 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:28:46,324 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:28:46,532 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:28:46,532 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:28:46,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:28:46,533 INFO L82 PathProgramCache]: Analyzing trace with hash 1615882355, now seen corresponding path program 1 times [2021-05-02 14:28:46,533 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:28:46,533 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [422706755] [2021-05-02 14:28:46,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:28:46,540 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:28:46,541 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [215581001] [2021-05-02 14:28:46,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:28:46,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:28:46,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 14:28:46,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:28:46,587 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:46,589 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:46,590 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:46,595 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:46,598 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:46,600 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:46,610 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:46,614 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:46,615 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:46,626 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:46,633 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:46,654 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:28:46,655 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:28:46,655 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [422706755] [2021-05-02 14:28:46,655 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:28:46,655 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [215581001] [2021-05-02 14:28:46,655 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [215581001] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:28:46,655 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:28:46,655 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 14:28:46,655 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [95542392] [2021-05-02 14:28:46,656 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 14:28:46,656 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:28:46,656 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 14:28:46,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:28:46,656 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 14:28:46,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:28:46,685 INFO L93 Difference]: Finished difference Result 46 states and 54 transitions. [2021-05-02 14:28:46,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 14:28:46,686 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2021-05-02 14:28:46,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:28:46,687 INFO L225 Difference]: With dead ends: 46 [2021-05-02 14:28:46,687 INFO L226 Difference]: Without dead ends: 39 [2021-05-02 14:28:46,687 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 15.7ms TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-05-02 14:28:46,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-02 14:28:46,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2021-05-02 14:28:46,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 29 states have (on average 1.3103448275862069) internal successors, (38), 30 states have internal predecessors, (38), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:28:46,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2021-05-02 14:28:46,690 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 18 [2021-05-02 14:28:46,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:28:46,690 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2021-05-02 14:28:46,691 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 14:28:46,691 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2021-05-02 14:28:46,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 14:28:46,691 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:28:46,691 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:28:46,907 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:28:46,908 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:28:46,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:28:46,908 INFO L82 PathProgramCache]: Analyzing trace with hash 1617669815, now seen corresponding path program 1 times [2021-05-02 14:28:46,908 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:28:46,908 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1201221360] [2021-05-02 14:28:46,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:28:46,915 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:28:46,915 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [736003016] [2021-05-02 14:28:46,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:28:46,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:28:46,986 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 14:28:46,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:28:47,035 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:47,037 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:47,050 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:28:47,050 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:28:47,050 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1201221360] [2021-05-02 14:28:47,050 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:28:47,050 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [736003016] [2021-05-02 14:28:47,050 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [736003016] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:28:47,050 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:28:47,050 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 14:28:47,050 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [163288298] [2021-05-02 14:28:47,051 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 14:28:47,051 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:28:47,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 14:28:47,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:28:47,053 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 14:28:47,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:28:47,115 INFO L93 Difference]: Finished difference Result 52 states and 63 transitions. [2021-05-02 14:28:47,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 14:28:47,116 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2021-05-02 14:28:47,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:28:47,116 INFO L225 Difference]: With dead ends: 52 [2021-05-02 14:28:47,117 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 14:28:47,117 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 20.7ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-02 14:28:47,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 14:28:47,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2021-05-02 14:28:47,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 35 states have (on average 1.2571428571428571) internal successors, (44), 36 states have internal predecessors, (44), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 14:28:47,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2021-05-02 14:28:47,121 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 18 [2021-05-02 14:28:47,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:28:47,121 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2021-05-02 14:28:47,121 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 14:28:47,121 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2021-05-02 14:28:47,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 14:28:47,121 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:28:47,121 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:28:47,337 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 14:28:47,337 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:28:47,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:28:47,337 INFO L82 PathProgramCache]: Analyzing trace with hash 1627795671, now seen corresponding path program 1 times [2021-05-02 14:28:47,338 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:28:47,338 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2105758704] [2021-05-02 14:28:47,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:28:47,343 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:28:47,343 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [715031940] [2021-05-02 14:28:47,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:28:47,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:28:47,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 14:28:47,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:28:47,424 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:28:47,425 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:28:47,425 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2105758704] [2021-05-02 14:28:47,425 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:28:47,425 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [715031940] [2021-05-02 14:28:47,426 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [715031940] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:28:47,426 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:28:47,426 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 14:28:47,426 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [128519200] [2021-05-02 14:28:47,426 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 14:28:47,426 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:28:47,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 14:28:47,426 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:28:47,426 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:28:47,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:28:47,440 INFO L93 Difference]: Finished difference Result 58 states and 69 transitions. [2021-05-02 14:28:47,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 14:28:47,441 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 24 [2021-05-02 14:28:47,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:28:47,443 INFO L225 Difference]: With dead ends: 58 [2021-05-02 14:28:47,443 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 14:28:47,443 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.1ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:28:47,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 14:28:47,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-05-02 14:28:47,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 27 states have internal predecessors, (33), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:28:47,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 41 transitions. [2021-05-02 14:28:47,456 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 41 transitions. Word has length 24 [2021-05-02 14:28:47,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:28:47,456 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 41 transitions. [2021-05-02 14:28:47,456 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:28:47,456 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 41 transitions. [2021-05-02 14:28:47,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 14:28:47,456 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:28:47,456 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:28:47,660 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:28:47,661 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:28:47,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:28:47,661 INFO L82 PathProgramCache]: Analyzing trace with hash -1817538190, now seen corresponding path program 1 times [2021-05-02 14:28:47,662 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:28:47,662 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [84495794] [2021-05-02 14:28:47,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:28:47,667 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:28:47,668 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1797309987] [2021-05-02 14:28:47,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:28:47,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:28:47,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 14:28:47,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:28:47,728 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:47,735 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:47,739 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:47,743 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:47,749 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:47,749 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:47,758 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:47,761 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:47,761 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:47,772 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:47,774 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:47,774 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:47,791 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:47,793 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:47,803 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:28:47,803 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:28:47,803 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [84495794] [2021-05-02 14:28:47,803 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:28:47,803 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1797309987] [2021-05-02 14:28:47,803 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1797309987] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:28:47,803 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:28:47,803 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 14:28:47,803 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818167876] [2021-05-02 14:28:47,804 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 14:28:47,804 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:28:47,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 14:28:47,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 14:28:47,805 INFO L87 Difference]: Start difference. First operand 35 states and 41 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:28:47,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:28:47,849 INFO L93 Difference]: Finished difference Result 60 states and 70 transitions. [2021-05-02 14:28:47,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 14:28:47,850 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 27 [2021-05-02 14:28:47,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:28:47,850 INFO L225 Difference]: With dead ends: 60 [2021-05-02 14:28:47,850 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 14:28:47,851 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 28.9ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 14:28:47,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 14:28:47,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 47. [2021-05-02 14:28:47,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 36 states have (on average 1.25) internal successors, (45), 37 states have internal predecessors, (45), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 14:28:47,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2021-05-02 14:28:47,861 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 27 [2021-05-02 14:28:47,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:28:47,861 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2021-05-02 14:28:47,862 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:28:47,862 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2021-05-02 14:28:47,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 14:28:47,863 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:28:47,863 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:28:48,068 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:28:48,069 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:28:48,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:28:48,069 INFO L82 PathProgramCache]: Analyzing trace with hash -1815750730, now seen corresponding path program 1 times [2021-05-02 14:28:48,070 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:28:48,070 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1748461263] [2021-05-02 14:28:48,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:28:48,081 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:28:48,081 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [17798544] [2021-05-02 14:28:48,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:28:48,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:28:48,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 14:28:48,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:28:48,205 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:48,208 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:48,270 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:48,272 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:48,290 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:28:48,290 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:28:48,290 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1748461263] [2021-05-02 14:28:48,290 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:28:48,290 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [17798544] [2021-05-02 14:28:48,290 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [17798544] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:28:48,290 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:28:48,290 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 14:28:48,290 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1312767527] [2021-05-02 14:28:48,291 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 14:28:48,291 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:28:48,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 14:28:48,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-05-02 14:28:48,291 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:28:48,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:28:48,425 INFO L93 Difference]: Finished difference Result 64 states and 73 transitions. [2021-05-02 14:28:48,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 14:28:48,429 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 27 [2021-05-02 14:28:48,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:28:48,429 INFO L225 Difference]: With dead ends: 64 [2021-05-02 14:28:48,430 INFO L226 Difference]: Without dead ends: 61 [2021-05-02 14:28:48,430 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 89.8ms TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-02 14:28:48,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-02 14:28:48,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53. [2021-05-02 14:28:48,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 40 states have (on average 1.225) internal successors, (49), 41 states have internal predecessors, (49), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 14:28:48,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 61 transitions. [2021-05-02 14:28:48,434 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 61 transitions. Word has length 27 [2021-05-02 14:28:48,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:28:48,434 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 61 transitions. [2021-05-02 14:28:48,434 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:28:48,434 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 61 transitions. [2021-05-02 14:28:48,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 14:28:48,434 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:28:48,435 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:28:48,636 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 14:28:48,637 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:28:48,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:28:48,637 INFO L82 PathProgramCache]: Analyzing trace with hash -2046623859, now seen corresponding path program 1 times [2021-05-02 14:28:48,637 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:28:48,637 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1305846278] [2021-05-02 14:28:48,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:28:48,644 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:28:48,644 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [443853354] [2021-05-02 14:28:48,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:28:48,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:28:48,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 14:28:48,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:28:48,690 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:48,691 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:48,691 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:48,696 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:48,697 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:48,698 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:48,704 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:48,706 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:48,706 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:48,715 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:48,720 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:48,738 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:28:48,738 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:28:48,738 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1305846278] [2021-05-02 14:28:48,738 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:28:48,738 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [443853354] [2021-05-02 14:28:48,738 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [443853354] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:28:48,738 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:28:48,738 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 14:28:48,738 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1089038214] [2021-05-02 14:28:48,739 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 14:28:48,739 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:28:48,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 14:28:48,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:28:48,739 INFO L87 Difference]: Start difference. First operand 53 states and 61 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:28:48,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:28:48,764 INFO L93 Difference]: Finished difference Result 76 states and 89 transitions. [2021-05-02 14:28:48,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 14:28:48,764 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 29 [2021-05-02 14:28:48,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:28:48,765 INFO L225 Difference]: With dead ends: 76 [2021-05-02 14:28:48,765 INFO L226 Difference]: Without dead ends: 55 [2021-05-02 14:28:48,765 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 18.5ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-02 14:28:48,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-02 14:28:48,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-05-02 14:28:48,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 42 states have (on average 1.2142857142857142) internal successors, (51), 43 states have internal predecessors, (51), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 14:28:48,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 63 transitions. [2021-05-02 14:28:48,768 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 63 transitions. Word has length 29 [2021-05-02 14:28:48,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:28:48,768 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 63 transitions. [2021-05-02 14:28:48,769 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:28:48,769 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 63 transitions. [2021-05-02 14:28:48,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 14:28:48,769 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:28:48,769 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:28:48,986 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:28:48,987 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:28:48,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:28:48,987 INFO L82 PathProgramCache]: Analyzing trace with hash 1080461875, now seen corresponding path program 2 times [2021-05-02 14:28:48,987 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:28:48,987 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1042473579] [2021-05-02 14:28:48,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:28:48,993 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:28:48,993 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1088009855] [2021-05-02 14:28:48,993 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:28:49,038 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 14:28:49,038 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:28:49,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 14:28:49,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:28:49,052 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:49,055 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:49,055 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:49,060 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:49,062 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:49,063 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:49,070 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:49,072 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:49,072 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:49,084 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:49,085 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:49,085 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:49,096 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:49,097 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:49,097 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:49,113 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:49,114 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:49,123 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:28:49,123 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:28:49,124 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1042473579] [2021-05-02 14:28:49,124 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:28:49,124 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1088009855] [2021-05-02 14:28:49,124 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1088009855] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:28:49,124 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:28:49,124 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 14:28:49,124 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [697934512] [2021-05-02 14:28:49,124 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 14:28:49,124 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:28:49,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 14:28:49,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 14:28:49,125 INFO L87 Difference]: Start difference. First operand 55 states and 63 transitions. Second operand has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:28:49,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:28:49,163 INFO L93 Difference]: Finished difference Result 81 states and 94 transitions. [2021-05-02 14:28:49,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 14:28:49,163 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 30 [2021-05-02 14:28:49,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:28:49,164 INFO L225 Difference]: With dead ends: 81 [2021-05-02 14:28:49,164 INFO L226 Difference]: Without dead ends: 74 [2021-05-02 14:28:49,164 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 26.9ms TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:28:49,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-05-02 14:28:49,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 68. [2021-05-02 14:28:49,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 53 states have (on average 1.2264150943396226) internal successors, (65), 54 states have internal predecessors, (65), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:28:49,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 79 transitions. [2021-05-02 14:28:49,167 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 79 transitions. Word has length 30 [2021-05-02 14:28:49,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:28:49,167 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 79 transitions. [2021-05-02 14:28:49,168 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:28:49,168 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 79 transitions. [2021-05-02 14:28:49,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 14:28:49,168 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:28:49,168 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:28:49,372 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:28:49,373 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:28:49,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:28:49,373 INFO L82 PathProgramCache]: Analyzing trace with hash 1082249335, now seen corresponding path program 2 times [2021-05-02 14:28:49,380 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:28:49,380 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [348416826] [2021-05-02 14:28:49,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:28:49,386 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:28:49,386 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1772461985] [2021-05-02 14:28:49,386 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:28:49,460 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 14:28:49,461 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:28:49,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 14:28:49,463 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:28:49,517 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:49,519 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:49,538 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:49,543 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:49,591 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:49,592 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:49,619 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:28:49,619 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:28:49,619 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [348416826] [2021-05-02 14:28:49,619 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:28:49,619 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1772461985] [2021-05-02 14:28:49,619 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1772461985] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:28:49,619 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:28:49,619 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 14:28:49,619 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278811741] [2021-05-02 14:28:49,619 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 14:28:49,619 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:28:49,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 14:28:49,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:28:49,620 INFO L87 Difference]: Start difference. First operand 68 states and 79 transitions. Second operand has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:28:49,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:28:49,774 INFO L93 Difference]: Finished difference Result 95 states and 111 transitions. [2021-05-02 14:28:49,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 14:28:49,774 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 30 [2021-05-02 14:28:49,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:28:49,775 INFO L225 Difference]: With dead ends: 95 [2021-05-02 14:28:49,775 INFO L226 Difference]: Without dead ends: 92 [2021-05-02 14:28:49,775 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 74.1ms TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 14:28:49,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-05-02 14:28:49,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 88. [2021-05-02 14:28:49,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 68 states have (on average 1.1911764705882353) internal successors, (81), 70 states have internal predecessors, (81), 11 states have call successors, (11), 9 states have call predecessors, (11), 8 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 14:28:49,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 101 transitions. [2021-05-02 14:28:49,780 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 101 transitions. Word has length 30 [2021-05-02 14:28:49,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:28:49,780 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 101 transitions. [2021-05-02 14:28:49,780 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:28:49,780 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 101 transitions. [2021-05-02 14:28:49,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 14:28:49,781 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:28:49,781 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:28:49,995 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 14:28:49,995 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:28:49,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:28:49,995 INFO L82 PathProgramCache]: Analyzing trace with hash 1417698711, now seen corresponding path program 3 times [2021-05-02 14:28:49,996 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:28:49,996 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [646848640] [2021-05-02 14:28:49,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:28:50,001 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:28:50,001 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2076476944] [2021-05-02 14:28:50,001 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:28:50,866 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 14:28:50,866 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:28:50,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 14:28:50,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:28:50,937 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:50,939 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:50,973 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:50,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:51,020 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 11 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:28:51,020 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:28:51,020 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [646848640] [2021-05-02 14:28:51,020 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:28:51,020 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2076476944] [2021-05-02 14:28:51,020 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2076476944] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:28:51,020 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:28:51,020 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 14:28:51,020 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114285330] [2021-05-02 14:28:51,020 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 14:28:51,021 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:28:51,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 14:28:51,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:28:51,021 INFO L87 Difference]: Start difference. First operand 88 states and 101 transitions. Second operand has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:28:51,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:28:51,054 INFO L93 Difference]: Finished difference Result 104 states and 119 transitions. [2021-05-02 14:28:51,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 14:28:51,054 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 36 [2021-05-02 14:28:51,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:28:51,057 INFO L225 Difference]: With dead ends: 104 [2021-05-02 14:28:51,057 INFO L226 Difference]: Without dead ends: 54 [2021-05-02 14:28:51,059 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 44.9ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:28:51,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-02 14:28:51,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 46. [2021-05-02 14:28:51,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 35 states have (on average 1.2) internal successors, (42), 36 states have internal predecessors, (42), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 14:28:51,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 52 transitions. [2021-05-02 14:28:51,062 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 52 transitions. Word has length 36 [2021-05-02 14:28:51,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:28:51,062 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 52 transitions. [2021-05-02 14:28:51,062 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:28:51,062 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 52 transitions. [2021-05-02 14:28:51,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 14:28:51,063 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:28:51,063 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:28:51,269 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 14:28:51,270 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:28:51,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:28:51,270 INFO L82 PathProgramCache]: Analyzing trace with hash 452880306, now seen corresponding path program 3 times [2021-05-02 14:28:51,270 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:28:51,270 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1308872406] [2021-05-02 14:28:51,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:28:51,276 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:28:51,276 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1719536709] [2021-05-02 14:28:51,276 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:28:51,699 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 14:28:51,699 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:28:51,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 14:28:51,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:28:51,711 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:51,713 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:51,713 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:51,716 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:51,718 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:51,718 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:51,726 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:51,728 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:51,728 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:51,735 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:51,736 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:51,737 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:51,746 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:51,763 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:51,763 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:51,778 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:51,779 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:51,780 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:51,796 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:51,797 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:51,806 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 4 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:28:51,806 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:28:51,806 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1308872406] [2021-05-02 14:28:51,806 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:28:51,806 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1719536709] [2021-05-02 14:28:51,806 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1719536709] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:28:51,806 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:28:51,806 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 14:28:51,806 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [681997501] [2021-05-02 14:28:51,807 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 14:28:51,807 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:28:51,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 14:28:51,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 14:28:51,807 INFO L87 Difference]: Start difference. First operand 46 states and 52 transitions. Second operand has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 8 states have internal predecessors, (31), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:28:51,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:28:51,855 INFO L93 Difference]: Finished difference Result 94 states and 108 transitions. [2021-05-02 14:28:51,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 14:28:51,857 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 8 states have internal predecessors, (31), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 39 [2021-05-02 14:28:51,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:28:51,857 INFO L225 Difference]: With dead ends: 94 [2021-05-02 14:28:51,857 INFO L226 Difference]: Without dead ends: 87 [2021-05-02 14:28:51,859 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 32.2ms TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-05-02 14:28:51,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-02 14:28:51,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 67. [2021-05-02 14:28:51,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 52 states have (on average 1.1923076923076923) internal successors, (62), 53 states have internal predecessors, (62), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:28:51,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 76 transitions. [2021-05-02 14:28:51,864 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 76 transitions. Word has length 39 [2021-05-02 14:28:51,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:28:51,864 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 76 transitions. [2021-05-02 14:28:51,864 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 8 states have internal predecessors, (31), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:28:51,864 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 76 transitions. [2021-05-02 14:28:51,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 14:28:51,864 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:28:51,864 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:28:52,070 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 14:28:52,071 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:28:52,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:28:52,071 INFO L82 PathProgramCache]: Analyzing trace with hash 454667766, now seen corresponding path program 4 times [2021-05-02 14:28:52,071 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:28:52,071 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1249746191] [2021-05-02 14:28:52,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:28:52,076 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:28:52,076 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2059872647] [2021-05-02 14:28:52,076 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:28:52,197 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 14:28:52,198 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:28:52,199 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 44 conjunts are in the unsatisfiable core [2021-05-02 14:28:52,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:28:52,311 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:52,312 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:52,423 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:52,434 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:52,508 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:52,511 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:52,541 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 3 proven. 24 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 14:28:52,541 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:28:52,541 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1249746191] [2021-05-02 14:28:52,541 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:28:52,541 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2059872647] [2021-05-02 14:28:52,541 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2059872647] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:28:52,541 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:28:52,541 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-05-02 14:28:52,542 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441126962] [2021-05-02 14:28:52,543 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 14:28:52,543 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:28:52,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 14:28:52,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2021-05-02 14:28:52,543 INFO L87 Difference]: Start difference. First operand 67 states and 76 transitions. Second operand has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:28:52,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:28:52,754 INFO L93 Difference]: Finished difference Result 108 states and 125 transitions. [2021-05-02 14:28:52,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 14:28:52,754 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 39 [2021-05-02 14:28:52,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:28:52,755 INFO L225 Difference]: With dead ends: 108 [2021-05-02 14:28:52,755 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 14:28:52,755 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 218.6ms TimeCoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2021-05-02 14:28:52,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 14:28:52,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 65. [2021-05-02 14:28:52,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 50 states have (on average 1.18) internal successors, (59), 51 states have internal predecessors, (59), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:28:52,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 73 transitions. [2021-05-02 14:28:52,759 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 73 transitions. Word has length 39 [2021-05-02 14:28:52,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:28:52,759 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 73 transitions. [2021-05-02 14:28:52,759 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:28:52,759 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 73 transitions. [2021-05-02 14:28:52,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 14:28:52,759 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:28:52,759 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:28:52,968 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:28:52,969 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:28:52,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:28:52,969 INFO L82 PathProgramCache]: Analyzing trace with hash 1559104567, now seen corresponding path program 2 times [2021-05-02 14:28:52,969 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:28:52,969 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [110461543] [2021-05-02 14:28:52,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:28:52,987 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:28:52,987 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1930570561] [2021-05-02 14:28:52,987 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:28:53,036 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 14:28:53,037 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:28:53,037 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 14:28:53,042 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:28:53,049 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,050 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,055 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,056 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,057 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,063 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,064 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,065 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,072 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,073 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,073 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,082 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,083 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,111 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-05-02 14:28:53,111 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:28:53,111 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [110461543] [2021-05-02 14:28:53,111 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:28:53,111 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1930570561] [2021-05-02 14:28:53,111 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1930570561] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:28:53,111 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:28:53,111 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 14:28:53,111 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730812082] [2021-05-02 14:28:53,112 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 14:28:53,112 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:28:53,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 14:28:53,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 14:28:53,112 INFO L87 Difference]: Start difference. First operand 65 states and 73 transitions. Second operand has 7 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:28:53,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:28:53,150 INFO L93 Difference]: Finished difference Result 96 states and 109 transitions. [2021-05-02 14:28:53,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 14:28:53,150 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 41 [2021-05-02 14:28:53,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:28:53,151 INFO L225 Difference]: With dead ends: 96 [2021-05-02 14:28:53,151 INFO L226 Difference]: Without dead ends: 67 [2021-05-02 14:28:53,151 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 28.8ms TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:28:53,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-05-02 14:28:53,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2021-05-02 14:28:53,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 52 states have (on average 1.1730769230769231) internal successors, (61), 53 states have internal predecessors, (61), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:28:53,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 75 transitions. [2021-05-02 14:28:53,154 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 75 transitions. Word has length 41 [2021-05-02 14:28:53,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:28:53,154 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 75 transitions. [2021-05-02 14:28:53,154 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:28:53,154 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 75 transitions. [2021-05-02 14:28:53,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 14:28:53,155 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:28:53,155 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:28:53,373 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 14:28:53,373 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:28:53,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:28:53,373 INFO L82 PathProgramCache]: Analyzing trace with hash 1179535091, now seen corresponding path program 4 times [2021-05-02 14:28:53,373 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:28:53,373 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [615932574] [2021-05-02 14:28:53,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:28:53,379 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:28:53,380 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [90830983] [2021-05-02 14:28:53,380 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:28:53,420 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 14:28:53,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:28:53,421 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 14:28:53,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:28:53,429 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,431 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,435 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,437 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,443 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,445 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,445 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,455 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,463 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,464 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,465 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,478 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,480 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,480 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,496 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,497 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,499 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,515 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,516 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:53,532 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 4 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:28:53,532 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:28:53,532 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [615932574] [2021-05-02 14:28:53,532 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:28:53,532 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [90830983] [2021-05-02 14:28:53,532 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [90830983] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:28:53,532 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:28:53,532 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 14:28:53,532 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [975618352] [2021-05-02 14:28:53,533 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 14:28:53,533 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:28:53,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 14:28:53,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:28:53,533 INFO L87 Difference]: Start difference. First operand 67 states and 75 transitions. Second operand has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:28:53,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:28:53,591 INFO L93 Difference]: Finished difference Result 115 states and 131 transitions. [2021-05-02 14:28:53,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 14:28:53,591 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 42 [2021-05-02 14:28:53,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:28:53,592 INFO L225 Difference]: With dead ends: 115 [2021-05-02 14:28:53,592 INFO L226 Difference]: Without dead ends: 108 [2021-05-02 14:28:53,592 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 49.8ms TimeCoverageRelationStatistics Valid=56, Invalid=100, Unknown=0, NotChecked=0, Total=156 [2021-05-02 14:28:53,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-05-02 14:28:53,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 88. [2021-05-02 14:28:53,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 69 states have (on average 1.173913043478261) internal successors, (81), 70 states have internal predecessors, (81), 10 states have call successors, (10), 9 states have call predecessors, (10), 8 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 14:28:53,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 99 transitions. [2021-05-02 14:28:53,596 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 99 transitions. Word has length 42 [2021-05-02 14:28:53,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:28:53,596 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 99 transitions. [2021-05-02 14:28:53,596 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:28:53,597 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 99 transitions. [2021-05-02 14:28:53,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 14:28:53,597 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:28:53,597 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:28:53,812 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 14:28:53,812 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:28:53,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:28:53,813 INFO L82 PathProgramCache]: Analyzing trace with hash 1181322551, now seen corresponding path program 5 times [2021-05-02 14:28:53,813 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:28:53,813 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [170799184] [2021-05-02 14:28:53,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:28:53,819 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:28:53,819 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1637779608] [2021-05-02 14:28:53,819 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:28:54,085 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-02 14:28:54,085 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:28:54,087 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 14:28:54,088 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:28:54,147 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:54,148 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:54,222 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:54,224 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:54,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:54,293 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:54,323 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 3 proven. 33 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 14:28:54,323 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:28:54,323 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [170799184] [2021-05-02 14:28:54,323 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:28:54,323 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1637779608] [2021-05-02 14:28:54,323 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1637779608] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:28:54,324 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:28:54,324 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-05-02 14:28:54,324 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073934995] [2021-05-02 14:28:54,325 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 14:28:54,325 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:28:54,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 14:28:54,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-05-02 14:28:54,326 INFO L87 Difference]: Start difference. First operand 88 states and 99 transitions. Second operand has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:28:54,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:28:54,554 INFO L93 Difference]: Finished difference Result 131 states and 150 transitions. [2021-05-02 14:28:54,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 14:28:54,555 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 42 [2021-05-02 14:28:54,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:28:54,555 INFO L225 Difference]: With dead ends: 131 [2021-05-02 14:28:54,555 INFO L226 Difference]: Without dead ends: 127 [2021-05-02 14:28:54,556 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 157.9ms TimeCoverageRelationStatistics Valid=41, Invalid=231, Unknown=0, NotChecked=0, Total=272 [2021-05-02 14:28:54,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-05-02 14:28:54,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 97. [2021-05-02 14:28:54,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 76 states have (on average 1.1710526315789473) internal successors, (89), 77 states have internal predecessors, (89), 11 states have call successors, (11), 10 states have call predecessors, (11), 9 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 14:28:54,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 109 transitions. [2021-05-02 14:28:54,564 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 109 transitions. Word has length 42 [2021-05-02 14:28:54,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:28:54,564 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 109 transitions. [2021-05-02 14:28:54,564 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:28:54,564 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 109 transitions. [2021-05-02 14:28:54,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 14:28:54,564 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:28:54,564 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:28:54,770 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:28:54,770 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:28:54,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:28:54,770 INFO L82 PathProgramCache]: Analyzing trace with hash -205316296, now seen corresponding path program 3 times [2021-05-02 14:28:54,770 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:28:54,770 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1566635792] [2021-05-02 14:28:54,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:28:54,776 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:28:54,776 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1182418861] [2021-05-02 14:28:54,776 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:28:56,833 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 14:28:56,833 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:28:56,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 14:28:56,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:28:56,866 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:56,868 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:56,878 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:56,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:56,909 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-05-02 14:28:56,909 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:28:56,909 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1566635792] [2021-05-02 14:28:56,909 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:28:56,909 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1182418861] [2021-05-02 14:28:56,909 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1182418861] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:28:56,909 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:28:56,909 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 14:28:56,909 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [871486753] [2021-05-02 14:28:56,909 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 14:28:56,909 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:28:56,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 14:28:56,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 14:28:56,910 INFO L87 Difference]: Start difference. First operand 97 states and 109 transitions. Second operand has 5 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:28:56,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:28:56,928 INFO L93 Difference]: Finished difference Result 128 states and 144 transitions. [2021-05-02 14:28:56,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 14:28:56,929 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 44 [2021-05-02 14:28:56,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:28:56,929 INFO L225 Difference]: With dead ends: 128 [2021-05-02 14:28:56,929 INFO L226 Difference]: Without dead ends: 97 [2021-05-02 14:28:56,929 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 14.2ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:28:56,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-05-02 14:28:56,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2021-05-02 14:28:56,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 76 states have (on average 1.1578947368421053) internal successors, (88), 77 states have internal predecessors, (88), 11 states have call successors, (11), 10 states have call predecessors, (11), 9 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 14:28:56,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 108 transitions. [2021-05-02 14:28:56,934 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 108 transitions. Word has length 44 [2021-05-02 14:28:56,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:28:56,934 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 108 transitions. [2021-05-02 14:28:56,934 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 14:28:56,934 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 108 transitions. [2021-05-02 14:28:56,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 14:28:56,934 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:28:56,934 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:28:57,139 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:28:57,140 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:28:57,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:28:57,140 INFO L82 PathProgramCache]: Analyzing trace with hash -1977904110, now seen corresponding path program 5 times [2021-05-02 14:28:57,140 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:28:57,140 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1350022053] [2021-05-02 14:28:57,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:28:57,146 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:28:57,146 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [135292349] [2021-05-02 14:28:57,146 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:28:57,240 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-05-02 14:28:57,240 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:28:57,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 14:28:57,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:28:57,251 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:57,252 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:57,252 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:57,256 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:57,257 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:57,258 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:57,264 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:57,265 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:57,266 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:57,272 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:57,274 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:57,274 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:57,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:57,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:57,283 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:57,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:57,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:57,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:57,302 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:57,303 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:57,304 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:57,331 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:57,332 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:57,335 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:57,351 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:57,352 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:28:57,361 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 4 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:28:57,362 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:28:57,362 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1350022053] [2021-05-02 14:28:57,362 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:28:57,362 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [135292349] [2021-05-02 14:28:57,362 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [135292349] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:28:57,362 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:28:57,362 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 14:28:57,362 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [723635985] [2021-05-02 14:28:57,362 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 14:28:57,362 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:28:57,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 14:28:57,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-02 14:28:57,363 INFO L87 Difference]: Start difference. First operand 97 states and 108 transitions. Second operand has 11 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 10 states have internal predecessors, (37), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:28:57,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:28:57,434 INFO L93 Difference]: Finished difference Result 156 states and 174 transitions. [2021-05-02 14:28:57,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 14:28:57,434 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 10 states have internal predecessors, (37), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 45 [2021-05-02 14:28:57,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:28:57,435 INFO L225 Difference]: With dead ends: 156 [2021-05-02 14:28:57,435 INFO L226 Difference]: Without dead ends: 149 [2021-05-02 14:28:57,435 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 56.3ms TimeCoverageRelationStatistics Valid=75, Invalid=135, Unknown=0, NotChecked=0, Total=210 [2021-05-02 14:28:57,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-05-02 14:28:57,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 127. [2021-05-02 14:28:57,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 99 states have (on average 1.1717171717171717) internal successors, (116), 101 states have internal predecessors, (116), 15 states have call successors, (15), 13 states have call predecessors, (15), 12 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-02 14:28:57,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 143 transitions. [2021-05-02 14:28:57,440 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 143 transitions. Word has length 45 [2021-05-02 14:28:57,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:28:57,440 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 143 transitions. [2021-05-02 14:28:57,440 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 10 states have internal predecessors, (37), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:28:57,440 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 143 transitions. [2021-05-02 14:28:57,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 14:28:57,441 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:28:57,441 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:28:57,648 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:28:57,648 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:28:57,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:28:57,649 INFO L82 PathProgramCache]: Analyzing trace with hash -1976116650, now seen corresponding path program 6 times [2021-05-02 14:28:57,649 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:28:57,649 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [161839476] [2021-05-02 14:28:57,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:28:57,658 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:28:57,658 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1378030752] [2021-05-02 14:28:57,658 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true