/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/prod4br-ll_unwindbound10.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 04:13:03,459 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 04:13:03,461 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 04:13:03,489 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 04:13:03,504 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 04:13:03,505 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 04:13:03,506 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 04:13:03,507 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 04:13:03,509 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 04:13:03,510 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 04:13:03,511 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 04:13:03,515 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 04:13:03,517 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 04:13:03,518 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 04:13:03,518 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 04:13:03,520 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 04:13:03,524 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 04:13:03,530 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 04:13:03,531 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 04:13:03,531 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 04:13:03,532 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 [2021-05-06 04:13:03,559 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 04:13:03,560 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 04:13:03,562 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-06 04:13:03,562 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-06 04:13:03,562 INFO L138 SettingsManager]: * Use SBE=true [2021-05-06 04:13:03,562 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 04:13:03,562 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 04:13:03,562 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 04:13:03,562 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 04:13:03,563 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 04:13:03,563 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 04:13:03,563 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 04:13:03,571 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 04:13:03,571 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 04:13:03,571 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 04:13:03,571 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 04:13:03,571 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 04:13:03,571 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 04:13:03,572 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 04:13:03,572 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 04:13:03,572 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 04:13:03,572 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 04:13:03,572 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-06 04:13:03,572 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-06 04:13:03,572 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 04:13:03,573 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-06 04:13:03,573 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 04:13:03,573 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-06 04:13:03,573 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 04:13:03,809 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 04:13:03,821 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 04:13:03,823 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 04:13:03,824 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 04:13:03,824 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 04:13:03,825 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/prod4br-ll_unwindbound10.c [2021-05-06 04:13:03,878 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/635ca80ca/33ffc3519947411a9adebb28ff829036/FLAG6eee3c381 [2021-05-06 04:13:04,276 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 04:13:04,276 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/prod4br-ll_unwindbound10.c [2021-05-06 04:13:04,281 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/635ca80ca/33ffc3519947411a9adebb28ff829036/FLAG6eee3c381 [2021-05-06 04:13:04,299 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/635ca80ca/33ffc3519947411a9adebb28ff829036 [2021-05-06 04:13:04,301 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 04:13:04,303 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 04:13:04,305 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 04:13:04,305 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 04:13:04,308 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 04:13:04,309 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 04:13:04" (1/1) ... [2021-05-06 04:13:04,309 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@682f13c5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:13:04, skipping insertion in model container [2021-05-06 04:13:04,309 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 04:13:04" (1/1) ... [2021-05-06 04:13:04,314 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 04:13:04,325 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 04:13:04,432 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/prod4br-ll_unwindbound10.c[524,537] [2021-05-06 04:13:04,456 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 04:13:04,461 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 04:13:04,494 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/prod4br-ll_unwindbound10.c[524,537] [2021-05-06 04:13:04,510 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 04:13:04,522 INFO L208 MainTranslator]: Completed translation [2021-05-06 04:13:04,523 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:13:04 WrapperNode [2021-05-06 04:13:04,523 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 04:13:04,524 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 04:13:04,525 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 04:13:04,525 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 04:13:04,533 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:13:04" (1/1) ... [2021-05-06 04:13:04,534 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:13:04" (1/1) ... [2021-05-06 04:13:04,550 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:13:04" (1/1) ... [2021-05-06 04:13:04,550 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:13:04" (1/1) ... [2021-05-06 04:13:04,559 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:13:04" (1/1) ... [2021-05-06 04:13:04,562 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:13:04" (1/1) ... [2021-05-06 04:13:04,563 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:13:04" (1/1) ... [2021-05-06 04:13:04,564 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 04:13:04,565 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 04:13:04,565 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 04:13:04,565 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 04:13:04,566 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:13:04" (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 [2021-05-06 04:13:04,627 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 04:13:04,627 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 04:13:04,627 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 04:13:04,627 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 04:13:04,627 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 04:13:04,627 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 04:13:04,628 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 04:13:04,628 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 04:13:04,628 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 04:13:04,628 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 04:13:04,628 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-06 04:13:04,629 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 04:13:04,629 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 04:13:04,629 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 04:13:04,630 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 04:13:04,630 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 04:13:04,630 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 04:13:04,630 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 04:13:04,630 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 04:13:04,630 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 04:13:04,857 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 04:13:04,857 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-06 04:13:04,858 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 04:13:04 BoogieIcfgContainer [2021-05-06 04:13:04,858 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 04:13:04,859 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 04:13:04,859 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 04:13:04,861 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 04:13:04,861 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 04:13:04" (1/3) ... [2021-05-06 04:13:04,861 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25a045af and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 04:13:04, skipping insertion in model container [2021-05-06 04:13:04,862 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:13:04" (2/3) ... [2021-05-06 04:13:04,862 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25a045af and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 04:13:04, skipping insertion in model container [2021-05-06 04:13:04,862 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 04:13:04" (3/3) ... [2021-05-06 04:13:04,863 INFO L111 eAbstractionObserver]: Analyzing ICFG prod4br-ll_unwindbound10.c [2021-05-06 04:13:04,866 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-06 04:13:04,871 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 04:13:04,895 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 04:13:04,910 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 04:13:04,910 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 04:13:04,910 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-06 04:13:04,910 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 04:13:04,910 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 04:13:04,910 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 04:13:04,910 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 04:13:04,910 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 04:13:04,920 INFO L276 IsEmpty]: Start isEmpty. Operand has 32 states, 20 states have (on average 1.45) internal successors, (29), 21 states have internal predecessors, (29), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 04:13:04,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 04:13:04,923 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:13:04,923 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:13:04,924 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:13:04,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:13:04,927 INFO L82 PathProgramCache]: Analyzing trace with hash 1717894843, now seen corresponding path program 1 times [2021-05-06 04:13:04,933 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:13:04,934 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2016306176] [2021-05-06 04:13:04,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:13:04,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:13:05,063 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 04:13:05,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:13:05,074 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 04:13:05,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:13:05,078 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 04:13:05,078 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:13:05,078 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2016306176] [2021-05-06 04:13:05,079 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2016306176] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 04:13:05,079 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 04:13:05,079 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 04:13:05,079 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [768806962] [2021-05-06 04:13:05,082 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 04:13:05,082 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:13:05,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 04:13:05,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 04:13:05,091 INFO L87 Difference]: Start difference. First operand has 32 states, 20 states have (on average 1.45) internal successors, (29), 21 states have internal predecessors, (29), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 04:13:05,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:13:05,151 INFO L93 Difference]: Finished difference Result 56 states and 77 transitions. [2021-05-06 04:13:05,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 04:13:05,152 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2021-05-06 04:13:05,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:13:05,156 INFO L225 Difference]: With dead ends: 56 [2021-05-06 04:13:05,157 INFO L226 Difference]: Without dead ends: 28 [2021-05-06 04:13:05,158 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 41.0ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 04:13:05,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-06 04:13:05,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2021-05-06 04:13:05,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 04:13:05,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 33 transitions. [2021-05-06 04:13:05,181 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 33 transitions. Word has length 17 [2021-05-06 04:13:05,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:13:05,181 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 33 transitions. [2021-05-06 04:13:05,181 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 04:13:05,182 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 33 transitions. [2021-05-06 04:13:05,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-06 04:13:05,182 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:13:05,183 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:13:05,183 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 04:13:05,183 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:13:05,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:13:05,183 INFO L82 PathProgramCache]: Analyzing trace with hash 444281082, now seen corresponding path program 1 times [2021-05-06 04:13:05,184 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:13:05,184 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1419877793] [2021-05-06 04:13:05,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:13:05,197 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:13:05,198 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [200410862] [2021-05-06 04:13:05,198 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 [2021-05-06 04:13:05,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:13:05,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-06 04:13:05,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:13:05,302 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:05,311 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:05,316 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:05,348 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:05,350 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:05,361 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 04:13:05,362 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:13:05,362 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1419877793] [2021-05-06 04:13:05,362 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:13:05,362 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [200410862] [2021-05-06 04:13:05,362 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [200410862] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 04:13:05,362 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 04:13:05,362 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 04:13:05,362 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [918477359] [2021-05-06 04:13:05,363 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 04:13:05,363 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:13:05,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 04:13:05,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 04:13:05,364 INFO L87 Difference]: Start difference. First operand 27 states and 33 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 04:13:05,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:13:05,373 INFO L93 Difference]: Finished difference Result 37 states and 44 transitions. [2021-05-06 04:13:05,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 04:13:05,377 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 18 [2021-05-06 04:13:05,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:13:05,377 INFO L225 Difference]: With dead ends: 37 [2021-05-06 04:13:05,378 INFO L226 Difference]: Without dead ends: 29 [2021-05-06 04:13:05,378 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.8ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 04:13:05,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-06 04:13:05,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-05-06 04:13:05,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 20 states have internal predecessors, (25), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 04:13:05,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2021-05-06 04:13:05,387 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 18 [2021-05-06 04:13:05,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:13:05,388 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2021-05-06 04:13:05,388 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 04:13:05,388 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2021-05-06 04:13:05,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-06 04:13:05,388 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:13:05,388 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:13:05,602 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-06 04:13:05,603 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:13:05,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:13:05,603 INFO L82 PathProgramCache]: Analyzing trace with hash 446068542, now seen corresponding path program 1 times [2021-05-06 04:13:05,604 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:13:05,604 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [20249556] [2021-05-06 04:13:05,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:13:05,614 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:13:05,615 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2101024138] [2021-05-06 04:13:05,615 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 [2021-05-06 04:13:05,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:13:05,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-06 04:13:05,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:13:05,712 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:05,725 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 04:13:05,725 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:13:05,725 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [20249556] [2021-05-06 04:13:05,725 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:13:05,726 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2101024138] [2021-05-06 04:13:05,726 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2101024138] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 04:13:05,726 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 04:13:05,726 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 04:13:05,726 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1386838901] [2021-05-06 04:13:05,726 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 04:13:05,726 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:13:05,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 04:13:05,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 04:13:05,727 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 04:13:05,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:13:05,781 INFO L93 Difference]: Finished difference Result 42 states and 53 transitions. [2021-05-06 04:13:05,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 04:13:05,782 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2021-05-06 04:13:05,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:13:05,782 INFO L225 Difference]: With dead ends: 42 [2021-05-06 04:13:05,783 INFO L226 Difference]: Without dead ends: 40 [2021-05-06 04:13:05,783 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 17.4ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 04:13:05,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-06 04:13:05,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 34. [2021-05-06 04:13:05,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 24 states have internal predecessors, (28), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 04:13:05,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2021-05-06 04:13:05,788 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 18 [2021-05-06 04:13:05,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:13:05,788 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2021-05-06 04:13:05,788 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 04:13:05,788 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2021-05-06 04:13:05,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-06 04:13:05,789 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:13:05,789 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:13:06,003 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:13:06,003 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:13:06,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:13:06,004 INFO L82 PathProgramCache]: Analyzing trace with hash -1308579644, now seen corresponding path program 1 times [2021-05-06 04:13:06,004 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:13:06,004 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1039944488] [2021-05-06 04:13:06,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:13:06,019 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:13:06,020 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1862482303] [2021-05-06 04:13:06,020 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 [2021-05-06 04:13:06,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:13:06,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-06 04:13:06,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:13:06,112 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:06,115 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:06,117 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:06,118 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:06,136 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:06,221 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:06,227 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:06,235 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:06,239 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:06,244 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:06,248 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:06,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:06,276 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:06,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:06,302 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 04:13:06,303 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:13:06,303 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1039944488] [2021-05-06 04:13:06,303 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:13:06,303 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1862482303] [2021-05-06 04:13:06,303 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1862482303] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:13:06,303 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:13:06,303 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-06 04:13:06,303 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1284413947] [2021-05-06 04:13:06,304 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 04:13:06,304 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:13:06,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 04:13:06,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2021-05-06 04:13:06,308 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand has 12 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 9 states have internal predecessors, (16), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 04:13:06,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:13:06,592 INFO L93 Difference]: Finished difference Result 51 states and 64 transitions. [2021-05-06 04:13:06,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 04:13:06,593 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 9 states have internal predecessors, (16), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2021-05-06 04:13:06,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:13:06,595 INFO L225 Difference]: With dead ends: 51 [2021-05-06 04:13:06,595 INFO L226 Difference]: Without dead ends: 43 [2021-05-06 04:13:06,596 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 208.0ms TimeCoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-06 04:13:06,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-06 04:13:06,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2021-05-06 04:13:06,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 27 states have (on average 1.3333333333333333) internal successors, (36), 29 states have internal predecessors, (36), 8 states have call successors, (8), 5 states have call predecessors, (8), 4 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 04:13:06,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 50 transitions. [2021-05-06 04:13:06,602 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 50 transitions. Word has length 24 [2021-05-06 04:13:06,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:13:06,602 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 50 transitions. [2021-05-06 04:13:06,602 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 9 states have internal predecessors, (16), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 04:13:06,602 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 50 transitions. [2021-05-06 04:13:06,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-06 04:13:06,603 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:13:06,603 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:13:06,813 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:13:06,813 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:13:06,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:13:06,814 INFO L82 PathProgramCache]: Analyzing trace with hash 1797927234, now seen corresponding path program 1 times [2021-05-06 04:13:06,814 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:13:06,814 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [953461520] [2021-05-06 04:13:06,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:13:06,831 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:13:06,831 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1526519101] [2021-05-06 04:13:06,831 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 [2021-05-06 04:13:06,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:13:06,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 04:13:06,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:13:06,886 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:06,888 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:06,888 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:06,900 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:06,902 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:06,903 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:06,918 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:06,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:06,930 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 04:13:06,930 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:13:06,930 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [953461520] [2021-05-06 04:13:06,930 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:13:06,930 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1526519101] [2021-05-06 04:13:06,930 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1526519101] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:13:06,931 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:13:06,931 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-06 04:13:06,931 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1860773873] [2021-05-06 04:13:06,931 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 04:13:06,931 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:13:06,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 04:13:06,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 04:13:06,932 INFO L87 Difference]: Start difference. First operand 40 states and 50 transitions. Second operand has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 4 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 04:13:06,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:13:06,969 INFO L93 Difference]: Finished difference Result 56 states and 71 transitions. [2021-05-06 04:13:06,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 04:13:06,969 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 4 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 27 [2021-05-06 04:13:06,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:13:06,970 INFO L225 Difference]: With dead ends: 56 [2021-05-06 04:13:06,970 INFO L226 Difference]: Without dead ends: 48 [2021-05-06 04:13:06,970 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 12.6ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 04:13:06,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-06 04:13:06,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-05-06 04:13:06,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 35 states have (on average 1.3428571428571427) internal successors, (47), 36 states have internal predecessors, (47), 8 states have call successors, (8), 5 states have call predecessors, (8), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 04:13:06,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 61 transitions. [2021-05-06 04:13:06,976 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 61 transitions. Word has length 27 [2021-05-06 04:13:06,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:13:06,976 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 61 transitions. [2021-05-06 04:13:06,976 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 4 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 04:13:06,976 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 61 transitions. [2021-05-06 04:13:06,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-06 04:13:06,976 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:13:06,977 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] [2021-05-06 04:13:07,198 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:13:07,198 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:13:07,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:13:07,199 INFO L82 PathProgramCache]: Analyzing trace with hash 1799714694, now seen corresponding path program 1 times [2021-05-06 04:13:07,199 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:13:07,199 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [298076059] [2021-05-06 04:13:07,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:13:07,206 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:13:07,206 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [21935952] [2021-05-06 04:13:07,206 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 [2021-05-06 04:13:07,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:13:07,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-06 04:13:07,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:13:07,317 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:07,319 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:07,388 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:07,390 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:07,399 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:07,404 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:07,419 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:07,420 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:07,425 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:07,463 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:07,464 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:07,465 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:07,496 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:07,497 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:07,498 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:07,502 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:07,503 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:07,505 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:07,507 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:07,507 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:07,508 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:07,512 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:07,527 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:07,539 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 04:13:07,539 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:13:07,539 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [298076059] [2021-05-06 04:13:07,539 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:13:07,539 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [21935952] [2021-05-06 04:13:07,539 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [21935952] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:13:07,539 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:13:07,539 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-06 04:13:07,539 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1758010588] [2021-05-06 04:13:07,540 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 04:13:07,540 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:13:07,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 04:13:07,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-06 04:13:07,540 INFO L87 Difference]: Start difference. First operand 48 states and 61 transitions. Second operand has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 7 states have internal predecessors, (19), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 04:13:07,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:13:07,657 INFO L93 Difference]: Finished difference Result 63 states and 81 transitions. [2021-05-06 04:13:07,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 04:13:07,657 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 7 states have internal predecessors, (19), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 27 [2021-05-06 04:13:07,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:13:07,658 INFO L225 Difference]: With dead ends: 63 [2021-05-06 04:13:07,658 INFO L226 Difference]: Without dead ends: 61 [2021-05-06 04:13:07,658 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 53.3ms TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-06 04:13:07,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-06 04:13:07,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 55. [2021-05-06 04:13:07,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 40 states have (on average 1.3) internal successors, (52), 42 states have internal predecessors, (52), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 04:13:07,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 68 transitions. [2021-05-06 04:13:07,663 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 68 transitions. Word has length 27 [2021-05-06 04:13:07,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:13:07,665 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 68 transitions. [2021-05-06 04:13:07,665 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 7 states have internal predecessors, (19), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 04:13:07,665 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 68 transitions. [2021-05-06 04:13:07,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-06 04:13:07,666 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:13:07,666 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, 1] [2021-05-06 04:13:07,880 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:13:07,881 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:13:07,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:13:07,881 INFO L82 PathProgramCache]: Analyzing trace with hash -1357155568, now seen corresponding path program 1 times [2021-05-06 04:13:07,881 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:13:07,881 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [767019149] [2021-05-06 04:13:07,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:13:07,888 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:13:07,888 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2116086410] [2021-05-06 04:13:07,888 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 [2021-05-06 04:13:07,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:13:07,945 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-06 04:13:07,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:13:07,984 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:07,986 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:08,048 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:08,049 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:08,059 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:08,068 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 04:13:08,069 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:13:08,069 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [767019149] [2021-05-06 04:13:08,069 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:13:08,069 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2116086410] [2021-05-06 04:13:08,069 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2116086410] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:13:08,069 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:13:08,069 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-06 04:13:08,069 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [341275897] [2021-05-06 04:13:08,069 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 04:13:08,069 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:13:08,070 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 04:13:08,070 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-05-06 04:13:08,070 INFO L87 Difference]: Start difference. First operand 55 states and 68 transitions. Second operand has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 9 states have internal predecessors, (20), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 04:13:08,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:13:08,266 INFO L93 Difference]: Finished difference Result 79 states and 102 transitions. [2021-05-06 04:13:08,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 04:13:08,267 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 9 states have internal predecessors, (20), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 28 [2021-05-06 04:13:08,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:13:08,268 INFO L225 Difference]: With dead ends: 79 [2021-05-06 04:13:08,268 INFO L226 Difference]: Without dead ends: 64 [2021-05-06 04:13:08,268 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 75.3ms TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-06 04:13:08,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-06 04:13:08,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2021-05-06 04:13:08,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 47 states have (on average 1.297872340425532) internal successors, (61), 49 states have internal predecessors, (61), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 04:13:08,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 79 transitions. [2021-05-06 04:13:08,283 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 79 transitions. Word has length 28 [2021-05-06 04:13:08,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:13:08,283 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 79 transitions. [2021-05-06 04:13:08,284 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 9 states have internal predecessors, (20), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 04:13:08,284 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 79 transitions. [2021-05-06 04:13:08,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-06 04:13:08,284 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:13:08,284 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, 1, 1] [2021-05-06 04:13:08,501 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:13:08,501 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:13:08,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:13:08,501 INFO L82 PathProgramCache]: Analyzing trace with hash -293334773, now seen corresponding path program 1 times [2021-05-06 04:13:08,502 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:13:08,502 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [642513289] [2021-05-06 04:13:08,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:13:08,507 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:13:08,508 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1752372140] [2021-05-06 04:13:08,508 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 [2021-05-06 04:13:08,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:13:08,569 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-06 04:13:08,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:13:08,636 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:08,637 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:08,643 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:08,652 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 04:13:08,652 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:13:08,652 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [642513289] [2021-05-06 04:13:08,652 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:13:08,652 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1752372140] [2021-05-06 04:13:08,652 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1752372140] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:13:08,652 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:13:08,652 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-06 04:13:08,653 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1945383984] [2021-05-06 04:13:08,653 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 04:13:08,653 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:13:08,653 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 04:13:08,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-06 04:13:08,653 INFO L87 Difference]: Start difference. First operand 64 states and 79 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 04:13:09,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:13:09,053 INFO L93 Difference]: Finished difference Result 92 states and 119 transitions. [2021-05-06 04:13:09,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 04:13:09,054 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2021-05-06 04:13:09,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:13:09,054 INFO L225 Difference]: With dead ends: 92 [2021-05-06 04:13:09,054 INFO L226 Difference]: Without dead ends: 77 [2021-05-06 04:13:09,055 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 44.4ms TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-05-06 04:13:09,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-06 04:13:09,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 74. [2021-05-06 04:13:09,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 55 states have (on average 1.290909090909091) internal successors, (71), 57 states have internal predecessors, (71), 11 states have call successors, (11), 8 states have call predecessors, (11), 7 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 04:13:09,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 91 transitions. [2021-05-06 04:13:09,060 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 91 transitions. Word has length 29 [2021-05-06 04:13:09,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:13:09,060 INFO L480 AbstractCegarLoop]: Abstraction has 74 states and 91 transitions. [2021-05-06 04:13:09,060 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 04:13:09,060 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 91 transitions. [2021-05-06 04:13:09,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-06 04:13:09,061 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:13:09,061 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, 1, 1] [2021-05-06 04:13:09,277 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:13:09,277 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:13:09,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:13:09,278 INFO L82 PathProgramCache]: Analyzing trace with hash 1481672589, now seen corresponding path program 1 times [2021-05-06 04:13:09,278 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:13:09,278 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [355106546] [2021-05-06 04:13:09,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:13:09,284 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:13:09,284 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [949629621] [2021-05-06 04:13:09,284 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 [2021-05-06 04:13:09,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:13:09,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-06 04:13:09,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:13:09,424 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:09,425 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:09,433 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:09,443 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 04:13:09,443 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:13:09,443 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [355106546] [2021-05-06 04:13:09,443 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:13:09,443 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [949629621] [2021-05-06 04:13:09,443 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [949629621] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:13:09,443 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:13:09,443 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-06 04:13:09,443 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561965476] [2021-05-06 04:13:09,443 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 04:13:09,443 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:13:09,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 04:13:09,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-06 04:13:09,444 INFO L87 Difference]: Start difference. First operand 74 states and 91 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 04:13:09,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:13:09,719 INFO L93 Difference]: Finished difference Result 87 states and 109 transitions. [2021-05-06 04:13:09,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 04:13:09,719 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2021-05-06 04:13:09,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:13:09,720 INFO L225 Difference]: With dead ends: 87 [2021-05-06 04:13:09,720 INFO L226 Difference]: Without dead ends: 85 [2021-05-06 04:13:09,720 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 54.7ms TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-05-06 04:13:09,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-05-06 04:13:09,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 72. [2021-05-06 04:13:09,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 53 states have (on average 1.3018867924528301) internal successors, (69), 55 states have internal predecessors, (69), 11 states have call successors, (11), 8 states have call predecessors, (11), 7 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 04:13:09,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 89 transitions. [2021-05-06 04:13:09,726 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 89 transitions. Word has length 29 [2021-05-06 04:13:09,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:13:09,726 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 89 transitions. [2021-05-06 04:13:09,726 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 04:13:09,726 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 89 transitions. [2021-05-06 04:13:09,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-06 04:13:09,726 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:13:09,727 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:13:09,943 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-06 04:13:09,943 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:13:09,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:13:09,944 INFO L82 PathProgramCache]: Analyzing trace with hash 1680888588, now seen corresponding path program 1 times [2021-05-06 04:13:09,944 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:13:09,944 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1230012809] [2021-05-06 04:13:09,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:13:09,949 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:13:09,949 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1735818891] [2021-05-06 04:13:09,949 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 [2021-05-06 04:13:09,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:13:09,986 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-06 04:13:09,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:13:10,010 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:10,031 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:10,032 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:10,046 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:10,047 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:10,053 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:10,053 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:10,067 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:10,068 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:10,069 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:10,070 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:10,080 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 04:13:10,081 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:13:10,081 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1230012809] [2021-05-06 04:13:10,081 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:13:10,081 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1735818891] [2021-05-06 04:13:10,081 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1735818891] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 04:13:10,081 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 04:13:10,081 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-06 04:13:10,081 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1727868245] [2021-05-06 04:13:10,081 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 04:13:10,081 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:13:10,082 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 04:13:10,082 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-05-06 04:13:10,082 INFO L87 Difference]: Start difference. First operand 72 states and 89 transitions. Second operand has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-06 04:13:10,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:13:10,150 INFO L93 Difference]: Finished difference Result 98 states and 127 transitions. [2021-05-06 04:13:10,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 04:13:10,150 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 33 [2021-05-06 04:13:10,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:13:10,151 INFO L225 Difference]: With dead ends: 98 [2021-05-06 04:13:10,151 INFO L226 Difference]: Without dead ends: 90 [2021-05-06 04:13:10,152 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 36.6ms TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-05-06 04:13:10,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-05-06 04:13:10,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 85. [2021-05-06 04:13:10,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 63 states have (on average 1.3333333333333333) internal successors, (84), 66 states have internal predecessors, (84), 14 states have call successors, (14), 8 states have call predecessors, (14), 7 states have return successors, (12), 10 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-06 04:13:10,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 110 transitions. [2021-05-06 04:13:10,166 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 110 transitions. Word has length 33 [2021-05-06 04:13:10,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:13:10,167 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 110 transitions. [2021-05-06 04:13:10,168 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-06 04:13:10,168 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 110 transitions. [2021-05-06 04:13:10,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-06 04:13:10,170 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:13:10,170 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:13:10,386 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:13:10,386 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:13:10,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:13:10,387 INFO L82 PathProgramCache]: Analyzing trace with hash 368374993, now seen corresponding path program 1 times [2021-05-06 04:13:10,387 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:13:10,387 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [164286893] [2021-05-06 04:13:10,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:13:10,392 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:13:10,392 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1080104817] [2021-05-06 04:13:10,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2021-05-06 04:13:10,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:13:10,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-06 04:13:10,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:13:10,483 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:10,484 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:10,497 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:10,535 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:10,554 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:13:10,567 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 04:13:10,567 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:13:10,567 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [164286893] [2021-05-06 04:13:10,567 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:13:10,568 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1080104817] [2021-05-06 04:13:10,568 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1080104817] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:13:10,568 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:13:10,568 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-06 04:13:10,568 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [308331342] [2021-05-06 04:13:10,568 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 04:13:10,568 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:13:10,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 04:13:10,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-06 04:13:10,568 INFO L87 Difference]: Start difference. First operand 85 states and 110 transitions. Second operand has 9 states, 8 states have (on average 3.125) internal successors, (25), 7 states have internal predecessors, (25), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4)