/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/sqrt1-ll_valuebound20.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 05:11:52,668 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 05:11:52,669 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 05:11:52,687 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 05:11:52,693 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 05:11:52,694 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 05:11:52,695 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 05:11:52,695 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 05:11:52,696 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 05:11:52,696 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 05:11:52,697 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 05:11:52,699 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 05:11:52,700 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 05:11:52,701 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 05:11:52,701 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 05:11:52,702 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 05:11:52,704 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 05:11:52,708 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 05:11:52,709 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 05:11:52,709 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 05:11:52,714 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 05:11:52,729 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 05:11:52,729 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 05:11:52,730 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-06 05:11:52,730 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-06 05:11:52,730 INFO L138 SettingsManager]: * Use SBE=true [2021-05-06 05:11:52,730 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 05:11:52,730 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 05:11:52,730 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 05:11:52,730 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 05:11:52,731 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 05:11:52,731 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 05:11:52,731 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 05:11:52,731 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 05:11:52,731 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 05:11:52,731 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 05:11:52,731 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 05:11:52,731 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 05:11:52,731 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 05:11:52,731 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 05:11:52,731 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 05:11:52,731 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 05:11:52,732 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 05:11:52,732 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-06 05:11:52,732 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-06 05:11:52,732 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 05:11:52,732 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-06 05:11:52,732 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 05:11:52,732 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-06 05:11:52,732 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 05:11:52,971 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 05:11:52,989 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 05:11:52,990 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 05:11:52,991 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 05:11:52,992 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 05:11:52,992 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/sqrt1-ll_valuebound20.c [2021-05-06 05:11:53,039 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/096b2f30e/555fc81f9bde4269a65b695a67aaf19a/FLAGf5f91fa32 [2021-05-06 05:11:53,418 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 05:11:53,419 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/sqrt1-ll_valuebound20.c [2021-05-06 05:11:53,424 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/096b2f30e/555fc81f9bde4269a65b695a67aaf19a/FLAGf5f91fa32 [2021-05-06 05:11:53,439 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/096b2f30e/555fc81f9bde4269a65b695a67aaf19a [2021-05-06 05:11:53,442 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 05:11:53,444 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 05:11:53,446 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 05:11:53,446 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 05:11:53,448 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 05:11:53,449 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 05:11:53" (1/1) ... [2021-05-06 05:11:53,449 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2c03f9b7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:11:53, skipping insertion in model container [2021-05-06 05:11:53,450 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 05:11:53" (1/1) ... [2021-05-06 05:11:53,454 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 05:11:53,468 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 05:11:53,587 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/sqrt1-ll_valuebound20.c[520,533] [2021-05-06 05:11:53,595 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 05:11:53,600 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 05:11:53,614 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/sqrt1-ll_valuebound20.c[520,533] [2021-05-06 05:11:53,629 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 05:11:53,640 INFO L208 MainTranslator]: Completed translation [2021-05-06 05:11:53,640 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:11:53 WrapperNode [2021-05-06 05:11:53,640 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 05:11:53,641 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 05:11:53,645 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 05:11:53,646 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 05:11:53,659 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:11:53" (1/1) ... [2021-05-06 05:11:53,659 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:11:53" (1/1) ... [2021-05-06 05:11:53,678 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:11:53" (1/1) ... [2021-05-06 05:11:53,679 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:11:53" (1/1) ... [2021-05-06 05:11:53,682 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:11:53" (1/1) ... [2021-05-06 05:11:53,685 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:11:53" (1/1) ... [2021-05-06 05:11:53,686 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:11:53" (1/1) ... [2021-05-06 05:11:53,687 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 05:11:53,687 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 05:11:53,687 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 05:11:53,687 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 05:11:53,688 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:11:53" (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 05:11:53,751 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 05:11:53,752 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 05:11:53,752 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 05:11:53,752 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 05:11:53,752 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 05:11:53,752 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 05:11:53,752 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 05:11:53,753 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 05:11:53,753 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 05:11:53,753 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 05:11:53,753 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-06 05:11:53,753 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 05:11:53,754 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 05:11:53,754 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 05:11:53,754 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 05:11:53,754 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 05:11:53,754 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 05:11:53,755 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 05:11:53,755 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 05:11:53,755 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 05:11:53,971 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 05:11:53,971 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-06 05:11:53,972 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 05:11:53 BoogieIcfgContainer [2021-05-06 05:11:53,973 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 05:11:53,974 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 05:11:53,974 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 05:11:53,976 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 05:11:53,976 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 05:11:53" (1/3) ... [2021-05-06 05:11:53,977 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3fbf275c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 05:11:53, skipping insertion in model container [2021-05-06 05:11:53,977 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:11:53" (2/3) ... [2021-05-06 05:11:53,977 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3fbf275c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 05:11:53, skipping insertion in model container [2021-05-06 05:11:53,977 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 05:11:53" (3/3) ... [2021-05-06 05:11:53,978 INFO L111 eAbstractionObserver]: Analyzing ICFG sqrt1-ll_valuebound20.c [2021-05-06 05:11:53,982 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-06 05:11:53,984 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 05:11:54,003 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 05:11:54,017 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 05:11:54,017 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 05:11:54,017 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-06 05:11:54,017 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 05:11:54,017 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 05:11:54,017 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 05:11:54,017 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 05:11:54,017 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 05:11:54,045 INFO L276 IsEmpty]: Start isEmpty. Operand has 31 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 9 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 05:11:54,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 05:11:54,048 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:11:54,049 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 05:11:54,049 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:11:54,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:11:54,052 INFO L82 PathProgramCache]: Analyzing trace with hash 326851384, now seen corresponding path program 1 times [2021-05-06 05:11:54,057 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:11:54,058 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [642039871] [2021-05-06 05:11:54,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:11:54,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:11:54,240 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:11:54,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:11:54,265 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 05:11:54,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:11:54,269 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 05:11:54,270 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:11:54,270 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [642039871] [2021-05-06 05:11:54,270 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [642039871] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 05:11:54,270 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 05:11:54,271 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 05:11:54,271 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1367052359] [2021-05-06 05:11:54,274 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 05:11:54,274 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:11:54,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 05:11:54,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 05:11:54,283 INFO L87 Difference]: Start difference. First operand has 31 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 9 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) 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 05:11:54,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:11:54,402 INFO L93 Difference]: Finished difference Result 53 states and 76 transitions. [2021-05-06 05:11:54,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 05:11:54,404 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 05:11:54,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:11:54,409 INFO L225 Difference]: With dead ends: 53 [2021-05-06 05:11:54,409 INFO L226 Difference]: Without dead ends: 26 [2021-05-06 05:11:54,412 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 52.9ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 05:11:54,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-06 05:11:54,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-05-06 05:11:54,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 14 states have internal predecessors, (15), 9 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 05:11:54,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 31 transitions. [2021-05-06 05:11:54,447 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 31 transitions. Word has length 17 [2021-05-06 05:11:54,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:11:54,447 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 31 transitions. [2021-05-06 05:11:54,448 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 05:11:54,448 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 31 transitions. [2021-05-06 05:11:54,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 05:11:54,450 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:11:54,450 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 05:11:54,450 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 05:11:54,451 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:11:54,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:11:54,451 INFO L82 PathProgramCache]: Analyzing trace with hash 1008578050, now seen corresponding path program 1 times [2021-05-06 05:11:54,452 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:11:54,452 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2116622316] [2021-05-06 05:11:54,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:11:54,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:11:54,574 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:11:54,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:11:54,585 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 05:11:54,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:11:54,594 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 05:11:54,594 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:11:54,594 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2116622316] [2021-05-06 05:11:54,595 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2116622316] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 05:11:54,595 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 05:11:54,595 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 05:11:54,595 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1879449800] [2021-05-06 05:11:54,596 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 05:11:54,596 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:11:54,596 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 05:11:54,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 05:11:54,597 INFO L87 Difference]: Start difference. First operand 26 states and 31 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 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 05:11:54,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:11:54,958 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2021-05-06 05:11:54,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 05:11:54,959 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 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 17 [2021-05-06 05:11:54,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:11:54,960 INFO L225 Difference]: With dead ends: 40 [2021-05-06 05:11:54,960 INFO L226 Difference]: Without dead ends: 38 [2021-05-06 05:11:54,961 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 208.1ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-06 05:11:54,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-06 05:11:54,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 36. [2021-05-06 05:11:54,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 20 states have internal predecessors, (21), 13 states have call successors, (13), 5 states have call predecessors, (13), 4 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-06 05:11:54,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 45 transitions. [2021-05-06 05:11:54,984 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 45 transitions. Word has length 17 [2021-05-06 05:11:54,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:11:54,985 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 45 transitions. [2021-05-06 05:11:54,985 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 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 05:11:54,985 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 45 transitions. [2021-05-06 05:11:54,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-06 05:11:54,986 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:11:54,986 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] [2021-05-06 05:11:54,986 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 05:11:54,987 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:11:54,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:11:54,990 INFO L82 PathProgramCache]: Analyzing trace with hash -789682422, now seen corresponding path program 1 times [2021-05-06 05:11:54,990 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:11:54,991 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [785842876] [2021-05-06 05:11:54,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:11:55,025 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:11:55,025 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1406699132] [2021-05-06 05:11:55,025 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 05:11:55,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:11:55,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 05:11:55,095 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:11:55,233 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:55,270 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 05:11:55,270 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:11:55,270 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [785842876] [2021-05-06 05:11:55,271 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:11:55,271 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1406699132] [2021-05-06 05:11:55,271 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1406699132] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 05:11:55,273 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 05:11:55,273 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 05:11:55,274 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618584341] [2021-05-06 05:11:55,274 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 05:11:55,274 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:11:55,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 05:11:55,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 05:11:55,275 INFO L87 Difference]: Start difference. First operand 36 states and 45 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:11:55,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:11:55,333 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2021-05-06 05:11:55,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 05:11:55,333 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 22 [2021-05-06 05:11:55,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:11:55,335 INFO L225 Difference]: With dead ends: 44 [2021-05-06 05:11:55,335 INFO L226 Difference]: Without dead ends: 42 [2021-05-06 05:11:55,335 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 23.7ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 05:11:55,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-06 05:11:55,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2021-05-06 05:11:55,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 23 states have internal predecessors, (24), 14 states have call successors, (14), 6 states have call predecessors, (14), 5 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-06 05:11:55,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 50 transitions. [2021-05-06 05:11:55,348 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 50 transitions. Word has length 22 [2021-05-06 05:11:55,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:11:55,348 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 50 transitions. [2021-05-06 05:11:55,349 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:11:55,349 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 50 transitions. [2021-05-06 05:11:55,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-06 05:11:55,350 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:11:55,350 INFO L523 BasicCegarLoop]: trace histogram [3, 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 05:11:55,565 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-06 05:11:55,565 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:11:55,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:11:55,566 INFO L82 PathProgramCache]: Analyzing trace with hash 2087529154, now seen corresponding path program 1 times [2021-05-06 05:11:55,566 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:11:55,566 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [442740745] [2021-05-06 05:11:55,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:11:55,574 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:11:55,574 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [458132811] [2021-05-06 05:11:55,574 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 05:11:55,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:11:55,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 05:11:55,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:11:55,730 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:55,741 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 05:11:55,741 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:11:55,741 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [442740745] [2021-05-06 05:11:55,741 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:11:55,741 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [458132811] [2021-05-06 05:11:55,741 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [458132811] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 05:11:55,741 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 05:11:55,742 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 05:11:55,742 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [264884525] [2021-05-06 05:11:55,742 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 05:11:55,742 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:11:55,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 05:11:55,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 05:11:55,743 INFO L87 Difference]: Start difference. First operand 41 states and 50 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 05:11:55,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:11:55,798 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2021-05-06 05:11:55,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 05:11:55,799 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 27 [2021-05-06 05:11:55,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:11:55,800 INFO L225 Difference]: With dead ends: 48 [2021-05-06 05:11:55,800 INFO L226 Difference]: Without dead ends: 43 [2021-05-06 05:11:55,801 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 22.9ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 05:11:55,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-06 05:11:55,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2021-05-06 05:11:55,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 24 states have (on average 1.0833333333333333) internal successors, (26), 25 states have internal predecessors, (26), 12 states have call successors, (12), 7 states have call predecessors, (12), 6 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 05:11:55,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 48 transitions. [2021-05-06 05:11:55,812 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 48 transitions. Word has length 27 [2021-05-06 05:11:55,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:11:55,812 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 48 transitions. [2021-05-06 05:11:55,812 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 05:11:55,812 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 48 transitions. [2021-05-06 05:11:55,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-06 05:11:55,813 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:11:55,813 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 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 05:11:56,031 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:11:56,032 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:11:56,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:11:56,032 INFO L82 PathProgramCache]: Analyzing trace with hash -2092280728, now seen corresponding path program 1 times [2021-05-06 05:11:56,032 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:11:56,033 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1492090339] [2021-05-06 05:11:56,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:11:56,040 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:11:56,040 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2087369233] [2021-05-06 05:11:56,040 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 05:11:56,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:11:56,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 05:11:56,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:11:56,196 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:56,203 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-06 05:11:56,204 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:11:56,204 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1492090339] [2021-05-06 05:11:56,204 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:11:56,204 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2087369233] [2021-05-06 05:11:56,204 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2087369233] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:11:56,204 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:11:56,204 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 05:11:56,204 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1476560888] [2021-05-06 05:11:56,204 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 05:11:56,205 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:11:56,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 05:11:56,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 05:11:56,205 INFO L87 Difference]: Start difference. First operand 43 states and 48 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-06 05:11:56,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:11:56,258 INFO L93 Difference]: Finished difference Result 57 states and 67 transitions. [2021-05-06 05:11:56,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 05:11:56,259 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 34 [2021-05-06 05:11:56,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:11:56,260 INFO L225 Difference]: With dead ends: 57 [2021-05-06 05:11:56,260 INFO L226 Difference]: Without dead ends: 55 [2021-05-06 05:11:56,260 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 23.5ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-06 05:11:56,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-06 05:11:56,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 53. [2021-05-06 05:11:56,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 29 states have (on average 1.103448275862069) internal successors, (32), 31 states have internal predecessors, (32), 16 states have call successors, (16), 8 states have call predecessors, (16), 7 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-06 05:11:56,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 62 transitions. [2021-05-06 05:11:56,277 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 62 transitions. Word has length 34 [2021-05-06 05:11:56,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:11:56,277 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 62 transitions. [2021-05-06 05:11:56,277 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-06 05:11:56,277 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 62 transitions. [2021-05-06 05:11:56,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-06 05:11:56,278 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:11:56,278 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 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 05:11:56,478 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:11:56,479 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:11:56,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:11:56,479 INFO L82 PathProgramCache]: Analyzing trace with hash 398970980, now seen corresponding path program 2 times [2021-05-06 05:11:56,479 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:11:56,479 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [496465684] [2021-05-06 05:11:56,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:11:56,486 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:11:56,486 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [130897999] [2021-05-06 05:11:56,486 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 05:11:56,550 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 05:11:56,550 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:11:56,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-06 05:11:56,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:11:56,648 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:56,657 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-06 05:11:56,657 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:11:56,657 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [496465684] [2021-05-06 05:11:56,657 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:11:56,658 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [130897999] [2021-05-06 05:11:56,658 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [130897999] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:11:56,658 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:11:56,658 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 05:11:56,658 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [533542523] [2021-05-06 05:11:56,658 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 05:11:56,658 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:11:56,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 05:11:56,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 05:11:56,659 INFO L87 Difference]: Start difference. First operand 53 states and 62 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-06 05:11:56,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:11:56,736 INFO L93 Difference]: Finished difference Result 61 states and 70 transitions. [2021-05-06 05:11:56,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 05:11:56,737 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 39 [2021-05-06 05:11:56,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:11:56,738 INFO L225 Difference]: With dead ends: 61 [2021-05-06 05:11:56,738 INFO L226 Difference]: Without dead ends: 59 [2021-05-06 05:11:56,738 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 28.5ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-06 05:11:56,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-05-06 05:11:56,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2021-05-06 05:11:56,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 32 states have (on average 1.09375) internal successors, (35), 34 states have internal predecessors, (35), 17 states have call successors, (17), 9 states have call predecessors, (17), 8 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2021-05-06 05:11:56,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 67 transitions. [2021-05-06 05:11:56,745 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 67 transitions. Word has length 39 [2021-05-06 05:11:56,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:11:56,745 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 67 transitions. [2021-05-06 05:11:56,745 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-06 05:11:56,745 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 67 transitions. [2021-05-06 05:11:56,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-06 05:11:56,746 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:11:56,746 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:11:56,965 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:11:56,966 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:11:56,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:11:56,966 INFO L82 PathProgramCache]: Analyzing trace with hash 1537313192, now seen corresponding path program 3 times [2021-05-06 05:11:56,966 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:11:56,966 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [648266243] [2021-05-06 05:11:56,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:11:56,973 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:11:56,973 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [21262666] [2021-05-06 05:11:56,973 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 05:11:57,013 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-06 05:11:57,014 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:11:57,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-06 05:11:57,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:11:57,092 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:57,099 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 10 proven. 4 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-06 05:11:57,100 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:11:57,100 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [648266243] [2021-05-06 05:11:57,100 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:11:57,100 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [21262666] [2021-05-06 05:11:57,100 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [21262666] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:11:57,100 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:11:57,100 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 05:11:57,100 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322344113] [2021-05-06 05:11:57,101 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 05:11:57,101 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:11:57,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 05:11:57,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 05:11:57,101 INFO L87 Difference]: Start difference. First operand 58 states and 67 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-06 05:11:57,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:11:57,152 INFO L93 Difference]: Finished difference Result 65 states and 73 transitions. [2021-05-06 05:11:57,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 05:11:57,152 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 44 [2021-05-06 05:11:57,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:11:57,153 INFO L225 Difference]: With dead ends: 65 [2021-05-06 05:11:57,153 INFO L226 Difference]: Without dead ends: 60 [2021-05-06 05:11:57,154 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 19.6ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-06 05:11:57,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-06 05:11:57,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-05-06 05:11:57,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 36 states have internal predecessors, (37), 15 states have call successors, (15), 10 states have call predecessors, (15), 9 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-06 05:11:57,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 65 transitions. [2021-05-06 05:11:57,159 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 65 transitions. Word has length 44 [2021-05-06 05:11:57,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:11:57,159 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 65 transitions. [2021-05-06 05:11:57,159 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-06 05:11:57,159 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 65 transitions. [2021-05-06 05:11:57,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-06 05:11:57,160 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:11:57,160 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:11:57,372 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-06 05:11:57,373 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:11:57,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:11:57,373 INFO L82 PathProgramCache]: Analyzing trace with hash -463567166, now seen corresponding path program 4 times [2021-05-06 05:11:57,373 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:11:57,374 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [84160931] [2021-05-06 05:11:57,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:11:57,380 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:11:57,380 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1109539829] [2021-05-06 05:11:57,380 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 05:11:57,418 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 05:11:57,419 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:11:57,419 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-06 05:11:57,421 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:11:57,510 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:57,518 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 12 proven. 9 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-05-06 05:11:57,519 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:11:57,519 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [84160931] [2021-05-06 05:11:57,519 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:11:57,519 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1109539829] [2021-05-06 05:11:57,519 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1109539829] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:11:57,519 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:11:57,519 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 05:11:57,519 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1992194969] [2021-05-06 05:11:57,519 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 05:11:57,520 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:11:57,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 05:11:57,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-06 05:11:57,520 INFO L87 Difference]: Start difference. First operand 60 states and 65 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 4 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-06 05:11:57,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:11:57,598 INFO L93 Difference]: Finished difference Result 74 states and 84 transitions. [2021-05-06 05:11:57,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 05:11:57,599 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 4 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 51 [2021-05-06 05:11:57,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:11:57,599 INFO L225 Difference]: With dead ends: 74 [2021-05-06 05:11:57,599 INFO L226 Difference]: Without dead ends: 72 [2021-05-06 05:11:57,600 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 24.2ms TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-06 05:11:57,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-06 05:11:57,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 70. [2021-05-06 05:11:57,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 40 states have (on average 1.075) internal successors, (43), 42 states have internal predecessors, (43), 19 states have call successors, (19), 11 states have call predecessors, (19), 10 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2021-05-06 05:11:57,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 79 transitions. [2021-05-06 05:11:57,606 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 79 transitions. Word has length 51 [2021-05-06 05:11:57,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:11:57,606 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 79 transitions. [2021-05-06 05:11:57,606 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 4 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-06 05:11:57,606 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 79 transitions. [2021-05-06 05:11:57,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-06 05:11:57,607 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:11:57,607 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:11:57,817 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:11:57,817 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:11:57,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:11:57,817 INFO L82 PathProgramCache]: Analyzing trace with hash 790038090, now seen corresponding path program 5 times [2021-05-06 05:11:57,818 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:11:57,818 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [47175354] [2021-05-06 05:11:57,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:11:57,826 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:11:57,826 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [371525978] [2021-05-06 05:11:57,827 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 05:11:57,871 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-05-06 05:11:57,871 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:11:57,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-06 05:11:57,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:11:57,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:58,001 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 14 proven. 11 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-05-06 05:11:58,001 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:11:58,001 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [47175354] [2021-05-06 05:11:58,001 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:11:58,001 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [371525978] [2021-05-06 05:11:58,001 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [371525978] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:11:58,002 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:11:58,002 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 05:11:58,002 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1129271072] [2021-05-06 05:11:58,003 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 05:11:58,003 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:11:58,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 05:11:58,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-06 05:11:58,003 INFO L87 Difference]: Start difference. First operand 70 states and 79 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-06 05:11:58,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:11:58,082 INFO L93 Difference]: Finished difference Result 78 states and 87 transitions. [2021-05-06 05:11:58,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 05:11:58,083 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) Word has length 56 [2021-05-06 05:11:58,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:11:58,085 INFO L225 Difference]: With dead ends: 78 [2021-05-06 05:11:58,085 INFO L226 Difference]: Without dead ends: 76 [2021-05-06 05:11:58,085 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 34.2ms TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-06 05:11:58,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-06 05:11:58,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2021-05-06 05:11:58,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 43 states have (on average 1.069767441860465) internal successors, (46), 45 states have internal predecessors, (46), 20 states have call successors, (20), 12 states have call predecessors, (20), 11 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-06 05:11:58,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 84 transitions. [2021-05-06 05:11:58,096 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 84 transitions. Word has length 56 [2021-05-06 05:11:58,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:11:58,097 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 84 transitions. [2021-05-06 05:11:58,097 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-06 05:11:58,097 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 84 transitions. [2021-05-06 05:11:58,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 05:11:58,102 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:11:58,102 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:11:58,308 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:11:58,311 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:11:58,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:11:58,311 INFO L82 PathProgramCache]: Analyzing trace with hash 1996886914, now seen corresponding path program 6 times [2021-05-06 05:11:58,312 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:11:58,312 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1245577290] [2021-05-06 05:11:58,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:11:58,325 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:11:58,325 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [106814268] [2021-05-06 05:11:58,325 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 05:11:58,380 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-05-06 05:11:58,381 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:11:58,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-06 05:11:58,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:11:58,413 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:58,417 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:58,425 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:58,426 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:58,433 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:58,434 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:58,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:58,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:58,463 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:58,464 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:58,473 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:58,474 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:58,496 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:58,499 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:58,507 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:58,509 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:58,547 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:58,556 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 36 proven. 14 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-05-06 05:11:58,556 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:11:58,556 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1245577290] [2021-05-06 05:11:58,556 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:11:58,556 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [106814268] [2021-05-06 05:11:58,556 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [106814268] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:11:58,556 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:11:58,556 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-06 05:11:58,556 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1740016133] [2021-05-06 05:11:58,557 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 05:11:58,557 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:11:58,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 05:11:58,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-05-06 05:11:58,557 INFO L87 Difference]: Start difference. First operand 75 states and 84 transitions. Second operand has 10 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 5 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) [2021-05-06 05:11:58,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:11:58,741 INFO L93 Difference]: Finished difference Result 86 states and 93 transitions. [2021-05-06 05:11:58,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 05:11:58,741 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 5 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) Word has length 61 [2021-05-06 05:11:58,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:11:58,744 INFO L225 Difference]: With dead ends: 86 [2021-05-06 05:11:58,744 INFO L226 Difference]: Without dead ends: 77 [2021-05-06 05:11:58,744 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 69.3ms TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-06 05:11:58,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-06 05:11:58,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2021-05-06 05:11:58,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 47 states have internal predecessors, (48), 18 states have call successors, (18), 13 states have call predecessors, (18), 12 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-06 05:11:58,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 82 transitions. [2021-05-06 05:11:58,763 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 82 transitions. Word has length 61 [2021-05-06 05:11:58,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:11:58,763 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 82 transitions. [2021-05-06 05:11:58,764 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 5 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) [2021-05-06 05:11:58,764 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 82 transitions. [2021-05-06 05:11:58,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-06 05:11:58,766 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:11:58,766 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 9, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:11:58,969 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-06 05:11:58,969 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:11:58,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:11:58,969 INFO L82 PathProgramCache]: Analyzing trace with hash -415362136, now seen corresponding path program 7 times [2021-05-06 05:11:58,970 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:11:58,970 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1445280774] [2021-05-06 05:11:58,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:11:58,975 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:11:58,975 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [195125445] [2021-05-06 05:11:58,975 INFO L93 rtionOrderModulation]: Changing assertion order to 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 05:11:59,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:11:59,020 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-06 05:11:59,021 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:11:59,137 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:59,146 INFO L134 CoverageAnalysis]: Checked inductivity of 183 backedges. 18 proven. 21 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-06 05:11:59,146 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:11:59,146 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1445280774] [2021-05-06 05:11:59,146 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:11:59,146 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [195125445] [2021-05-06 05:11:59,146 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [195125445] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:11:59,146 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:11:59,146 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-06 05:11:59,146 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1216601500] [2021-05-06 05:11:59,146 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 05:11:59,147 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:11:59,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 05:11:59,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-06 05:11:59,147 INFO L87 Difference]: Start difference. First operand 77 states and 82 transitions. Second operand has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 5 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) [2021-05-06 05:11:59,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:11:59,227 INFO L93 Difference]: Finished difference Result 91 states and 101 transitions. [2021-05-06 05:11:59,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 05:11:59,228 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 5 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) Word has length 68 [2021-05-06 05:11:59,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:11:59,229 INFO L225 Difference]: With dead ends: 91 [2021-05-06 05:11:59,229 INFO L226 Difference]: Without dead ends: 89 [2021-05-06 05:11:59,229 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 31.5ms TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-06 05:11:59,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-05-06 05:11:59,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 87. [2021-05-06 05:11:59,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 51 states have (on average 1.0588235294117647) internal successors, (54), 53 states have internal predecessors, (54), 22 states have call successors, (22), 14 states have call predecessors, (22), 13 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2021-05-06 05:11:59,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 96 transitions. [2021-05-06 05:11:59,235 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 96 transitions. Word has length 68 [2021-05-06 05:11:59,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:11:59,235 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 96 transitions. [2021-05-06 05:11:59,235 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 5 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) [2021-05-06 05:11:59,235 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 96 transitions. [2021-05-06 05:11:59,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 05:11:59,235 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:11:59,235 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 10, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:11:59,452 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:11:59,453 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:11:59,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:11:59,453 INFO L82 PathProgramCache]: Analyzing trace with hash -1903584988, now seen corresponding path program 8 times [2021-05-06 05:11:59,453 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:11:59,453 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1441650018] [2021-05-06 05:11:59,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:11:59,458 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:11:59,458 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [75364313] [2021-05-06 05:11:59,458 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:11:59,506 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 05:11:59,506 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:11:59,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-06 05:11:59,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:11:59,543 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:59,544 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:59,551 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:59,552 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:59,559 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:59,561 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:59,581 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:59,582 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:59,588 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:59,589 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:59,600 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:59,602 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:59,618 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:59,620 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:59,628 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:59,629 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:59,706 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:11:59,715 INFO L134 CoverageAnalysis]: Checked inductivity of 224 backedges. 40 proven. 31 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-05-06 05:11:59,715 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:11:59,715 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1441650018] [2021-05-06 05:11:59,715 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:11:59,715 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [75364313] [2021-05-06 05:11:59,715 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [75364313] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:11:59,716 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:11:59,716 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-06 05:11:59,716 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [965467749] [2021-05-06 05:11:59,716 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 05:11:59,716 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:11:59,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 05:11:59,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-05-06 05:11:59,717 INFO L87 Difference]: Start difference. First operand 87 states and 96 transitions. Second operand has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 6 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 6 states have call predecessors, (12), 6 states have call successors, (12) [2021-05-06 05:11:59,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:11:59,852 INFO L93 Difference]: Finished difference Result 95 states and 104 transitions. [2021-05-06 05:11:59,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 05:11:59,853 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 6 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 6 states have call predecessors, (12), 6 states have call successors, (12) Word has length 73 [2021-05-06 05:11:59,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:11:59,853 INFO L225 Difference]: With dead ends: 95 [2021-05-06 05:11:59,853 INFO L226 Difference]: Without dead ends: 93 [2021-05-06 05:11:59,854 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 86.7ms TimeCoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-06 05:11:59,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-06 05:11:59,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 92. [2021-05-06 05:11:59,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 54 states have (on average 1.0555555555555556) internal successors, (57), 56 states have internal predecessors, (57), 23 states have call successors, (23), 15 states have call predecessors, (23), 14 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2021-05-06 05:11:59,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 101 transitions. [2021-05-06 05:11:59,860 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 101 transitions. Word has length 73 [2021-05-06 05:11:59,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:11:59,860 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 101 transitions. [2021-05-06 05:11:59,860 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 6 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 6 states have call predecessors, (12), 6 states have call successors, (12) [2021-05-06 05:11:59,860 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 101 transitions. [2021-05-06 05:11:59,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-05-06 05:11:59,860 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:11:59,861 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:12:00,079 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:12:00,079 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:12:00,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:12:00,080 INFO L82 PathProgramCache]: Analyzing trace with hash -2040579864, now seen corresponding path program 9 times [2021-05-06 05:12:00,080 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:12:00,080 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [282711374] [2021-05-06 05:12:00,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:12:00,085 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:12:00,085 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [656939994] [2021-05-06 05:12:00,085 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:12:00,188 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-06 05:12:00,188 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:12:00,189 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-06 05:12:00,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:12:00,275 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:00,277 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:04,481 WARN L205 SmtUtils]: Spent 1.32 s on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2021-05-06 05:12:04,486 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:04,493 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:04,505 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:04,517 INFO L134 CoverageAnalysis]: Checked inductivity of 269 backedges. 105 proven. 3 refuted. 0 times theorem prover too weak. 161 trivial. 0 not checked. [2021-05-06 05:12:04,518 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:12:04,518 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [282711374] [2021-05-06 05:12:04,518 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:12:04,518 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [656939994] [2021-05-06 05:12:04,518 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [656939994] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:12:04,518 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:12:04,518 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-06 05:12:04,518 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [141511120] [2021-05-06 05:12:04,518 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 05:12:04,519 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:12:04,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 05:12:04,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=52, Unknown=1, NotChecked=0, Total=72 [2021-05-06 05:12:04,520 INFO L87 Difference]: Start difference. First operand 92 states and 101 transitions. Second operand has 9 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-06 05:12:05,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:12:05,018 INFO L93 Difference]: Finished difference Result 92 states and 101 transitions. [2021-05-06 05:12:05,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 05:12:05,018 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) Word has length 78 [2021-05-06 05:12:05,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:12:05,019 INFO L225 Difference]: With dead ends: 92 [2021-05-06 05:12:05,019 INFO L226 Difference]: Without dead ends: 0 [2021-05-06 05:12:05,019 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 69 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 4214.8ms TimeCoverageRelationStatistics Valid=25, Invalid=64, Unknown=1, NotChecked=0, Total=90 [2021-05-06 05:12:05,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-06 05:12:05,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-06 05:12:05,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-06 05:12:05,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-06 05:12:05,020 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 78 [2021-05-06 05:12:05,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:12:05,020 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-06 05:12:05,020 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-06 05:12:05,020 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-06 05:12:05,020 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-06 05:12:05,220 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-06 05:12:05,222 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-05-06 05:12:05,489 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 24 [2021-05-06 05:12:05,675 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 15 [2021-05-06 05:12:05,773 INFO L198 CegarLoopUtils]: For program point reach_errorEXIT(line 5) no Hoare annotation was computed. [2021-05-06 05:12:05,774 INFO L198 CegarLoopUtils]: For program point reach_errorENTRY(line 5) no Hoare annotation was computed. [2021-05-06 05:12:05,774 INFO L198 CegarLoopUtils]: For program point reach_errorFINAL(line 5) no Hoare annotation was computed. [2021-05-06 05:12:05,774 INFO L198 CegarLoopUtils]: For program point ULTIMATE.initFINAL(line -1) no Hoare annotation was computed. [2021-05-06 05:12:05,774 INFO L194 CegarLoopUtils]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |#t~string5.base| |old(#t~string5.base)|) (= |#t~string5.offset| |old(#t~string5.offset)|) (= |old(#length)| |#length|) (= |#t~string6.base| |old(#t~string6.base)|) (= |#t~string6.offset| |old(#t~string6.offset)|) (= |#t~string4.base| |old(#t~string4.base)|) (= |#NULL.base| |old(#NULL.base)|) (= |#t~string4.offset| |old(#t~string4.offset)|) (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#valid)| |#valid|)) [2021-05-06 05:12:05,774 INFO L198 CegarLoopUtils]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2021-05-06 05:12:05,774 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-05-06 05:12:05,774 INFO L201 CegarLoopUtils]: At program point L-1(line -1) the Hoare annotation is: true [2021-05-06 05:12:05,774 INFO L201 CegarLoopUtils]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2021-05-06 05:12:05,774 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2021-05-06 05:12:05,774 INFO L201 CegarLoopUtils]: At program point assume_abort_if_notENTRY(lines 8 10) the Hoare annotation is: true [2021-05-06 05:12:05,774 INFO L198 CegarLoopUtils]: For program point L9(line 9) no Hoare annotation was computed. [2021-05-06 05:12:05,774 INFO L198 CegarLoopUtils]: For program point L9-2(lines 8 10) no Hoare annotation was computed. [2021-05-06 05:12:05,774 INFO L198 CegarLoopUtils]: For program point assume_abort_if_notEXIT(lines 8 10) no Hoare annotation was computed. [2021-05-06 05:12:05,774 INFO L198 CegarLoopUtils]: For program point L33(lines 30 42) no Hoare annotation was computed. [2021-05-06 05:12:05,775 INFO L194 CegarLoopUtils]: At program point L31(line 31) the Hoare annotation is: (and (= (* main_~s~0 4) (+ (* main_~t~0 main_~t~0) (* main_~t~0 2) 1)) (= (+ (* main_~a~0 2) 1) main_~t~0)) [2021-05-06 05:12:05,775 INFO L194 CegarLoopUtils]: At program point L31-1(line 31) the Hoare annotation is: (and (= (* main_~s~0 4) (+ (* main_~t~0 main_~t~0) (* main_~t~0 2) 1)) (= (+ (* main_~a~0 2) 1) main_~t~0)) [2021-05-06 05:12:05,775 INFO L198 CegarLoopUtils]: For program point mainEXIT(lines 20 49) no Hoare annotation was computed. [2021-05-06 05:12:05,775 INFO L198 CegarLoopUtils]: For program point L46(line 46) no Hoare annotation was computed. [2021-05-06 05:12:05,775 INFO L198 CegarLoopUtils]: For program point mainFINAL(lines 20 49) no Hoare annotation was computed. [2021-05-06 05:12:05,775 INFO L194 CegarLoopUtils]: At program point L44(line 44) the Hoare annotation is: (and (= (* main_~s~0 4) (+ (* main_~t~0 main_~t~0) (* main_~t~0 2) 1)) (= (+ (* main_~a~0 2) 1) main_~t~0)) [2021-05-06 05:12:05,775 INFO L194 CegarLoopUtils]: At program point L32(line 32) the Hoare annotation is: (and (= (* main_~s~0 4) (+ (* main_~t~0 main_~t~0) (* main_~t~0 2) 1)) (= (+ (* main_~a~0 2) 1) main_~t~0)) [2021-05-06 05:12:05,775 INFO L201 CegarLoopUtils]: At program point mainENTRY(lines 20 49) the Hoare annotation is: true [2021-05-06 05:12:05,775 INFO L194 CegarLoopUtils]: At program point L30-2(lines 30 42) the Hoare annotation is: (and (= (* main_~s~0 4) (+ (* main_~t~0 main_~t~0) (* main_~t~0 2) 1)) (= (+ (* main_~a~0 2) 1) main_~t~0)) [2021-05-06 05:12:05,775 INFO L194 CegarLoopUtils]: At program point L30-3(lines 30 42) the Hoare annotation is: (and (= (* main_~s~0 4) (+ (* main_~t~0 main_~t~0) (* main_~t~0 2) 1)) (= (+ (* main_~a~0 2) 1) main_~t~0)) [2021-05-06 05:12:05,775 INFO L201 CegarLoopUtils]: At program point L24(line 24) the Hoare annotation is: true [2021-05-06 05:12:05,775 INFO L198 CegarLoopUtils]: For program point L24-1(line 24) no Hoare annotation was computed. [2021-05-06 05:12:05,775 INFO L194 CegarLoopUtils]: At program point L45(line 45) the Hoare annotation is: (or (and (= (* main_~s~0 4) (+ (* main_~t~0 main_~t~0) (* main_~t~0 2) 1)) (= (+ (* main_~a~0 2) 1) main_~t~0)) (and (= main_~t~0 1) (= main_~s~0 1)) (and (= main_~t~0 3) (= main_~s~0 (+ main_~t~0 1)))) [2021-05-06 05:12:05,775 INFO L201 CegarLoopUtils]: At program point __VERIFIER_assertENTRY(lines 11 17) the Hoare annotation is: true [2021-05-06 05:12:05,775 INFO L198 CegarLoopUtils]: For program point L13(lines 13 14) no Hoare annotation was computed. [2021-05-06 05:12:05,776 INFO L198 CegarLoopUtils]: For program point L12(lines 12 15) no Hoare annotation was computed. [2021-05-06 05:12:05,776 INFO L198 CegarLoopUtils]: For program point L12-2(lines 11 17) no Hoare annotation was computed. [2021-05-06 05:12:05,776 INFO L198 CegarLoopUtils]: For program point __VERIFIER_assertEXIT(lines 11 17) no Hoare annotation was computed. [2021-05-06 05:12:05,776 INFO L198 CegarLoopUtils]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 14) no Hoare annotation was computed. [2021-05-06 05:12:05,786 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 05:12:05 BoogieIcfgContainer [2021-05-06 05:12:05,786 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-06 05:12:05,787 INFO L168 Benchmark]: Toolchain (without parser) took 12343.38 ms. Allocated memory was 189.8 MB in the beginning and 243.3 MB in the end (delta: 53.5 MB). Free memory was 155.2 MB in the beginning and 154.7 MB in the end (delta: 466.9 kB). Peak memory consumption was 125.2 MB. Max. memory is 8.0 GB. [2021-05-06 05:12:05,787 INFO L168 Benchmark]: CDTParser took 0.15 ms. Allocated memory is still 189.8 MB. Free memory was 172.0 MB in the beginning and 171.9 MB in the end (delta: 139.6 kB). There was no memory consumed. Max. memory is 8.0 GB. [2021-05-06 05:12:05,787 INFO L168 Benchmark]: CACSL2BoogieTranslator took 194.53 ms. Allocated memory is still 189.8 MB. Free memory was 155.0 MB in the beginning and 145.1 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-05-06 05:12:05,787 INFO L168 Benchmark]: Boogie Preprocessor took 45.71 ms. Allocated memory is still 189.8 MB. Free memory was 145.1 MB in the beginning and 172.5 MB in the end (delta: -27.3 MB). Peak memory consumption was 4.2 MB. Max. memory is 8.0 GB. [2021-05-06 05:12:05,787 INFO L168 Benchmark]: RCFGBuilder took 285.29 ms. Allocated memory is still 189.8 MB. Free memory was 172.5 MB in the beginning and 157.3 MB in the end (delta: 15.2 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. [2021-05-06 05:12:05,787 INFO L168 Benchmark]: TraceAbstraction took 11812.72 ms. Allocated memory was 189.8 MB in the beginning and 243.3 MB in the end (delta: 53.5 MB). Free memory was 156.8 MB in the beginning and 154.7 MB in the end (delta: 2.0 MB). Peak memory consumption was 127.4 MB. Max. memory is 8.0 GB. [2021-05-06 05:12:05,787 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.15 ms. Allocated memory is still 189.8 MB. Free memory was 172.0 MB in the beginning and 171.9 MB in the end (delta: 139.6 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 194.53 ms. Allocated memory is still 189.8 MB. Free memory was 155.0 MB in the beginning and 145.1 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 45.71 ms. Allocated memory is still 189.8 MB. Free memory was 145.1 MB in the beginning and 172.5 MB in the end (delta: -27.3 MB). Peak memory consumption was 4.2 MB. Max. memory is 8.0 GB. * RCFGBuilder took 285.29 ms. Allocated memory is still 189.8 MB. Free memory was 172.5 MB in the beginning and 157.3 MB in the end (delta: 15.2 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 11812.72 ms. Allocated memory was 189.8 MB in the beginning and 243.3 MB in the end (delta: 53.5 MB). Free memory was 156.8 MB in the beginning and 154.7 MB in the end (delta: 2.0 MB). Peak memory consumption was 127.4 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 14]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 34 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 11205.5ms, OverallIterations: 13, TraceHistogramMax: 12, EmptinessCheckTime: 38.1ms, AutomataDifference: 1881.2ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 552.2ms, InitialAbstractionConstructionTime: 6.9ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 434 SDtfs, 125 SDslu, 1549 SDs, 0 SdLazy, 1085 SolverSat, 105 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1204.3ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 576 GetRequests, 494 SyntacticMatches, 1 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 4840.3ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=92occurred in iteration=12, InterpolantAutomatonStates: 86, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 146.2ms AutomataMinimizationTime, 13 MinimizatonAttempts, 12 StatesRemovedByMinimization, 8 NontrivialMinimizations, HoareAnnotationStatistics: 0.0ms HoareAnnotationTime, 14 LocationsWithAnnotation, 48 PreInvPairs, 82 NumberOfFragments, 194 HoareAnnotationTreeSize, 48 FomulaSimplifications, 14442 FormulaSimplificationTreeSizeReduction, 107.2ms HoareSimplificationTime, 14 FomulaSimplificationsInter, 3052 FormulaSimplificationTreeSizeReductionInter, 436.3ms HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 100.5ms SsaConstructionTime, 339.4ms SatisfiabilityAnalysisTime, 5900.9ms InterpolantComputationTime, 587 NumberOfCodeBlocks, 537 NumberOfCodeBlocksAsserted, 26 NumberOfCheckSat, 574 ConstructedInterpolants, 0 QuantifiedInterpolants, 1673 SizeOfPredicates, 22 NumberOfNonLiveVariables, 1734 ConjunctsInSsa, 192 ConjunctsInUnsatCore, 13 InterpolantComputations, 4 PerfectInterpolantSequences, 1028/1126 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 30]: Loop Invariant Derived loop invariant: s * 4 == t * t + t * 2 + 1 && a * 2 + 1 == t RESULT: Ultimate proved your program to be correct! Received shutdown request...