/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/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/nla-digbench/egcd-ll.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 19:15:24,802 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 19:15:24,804 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 19:15:24,836 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 19:15:24,837 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 19:15:24,839 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 19:15:24,842 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 19:15:24,846 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 19:15:24,848 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 19:15:24,852 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 19:15:24,853 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 19:15:24,854 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 19:15:24,854 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 19:15:24,856 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 19:15:24,857 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 19:15:24,859 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 19:15:24,861 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 19:15:24,861 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 19:15:24,863 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 19:15:24,868 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 19:15:24,869 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 19:15:24,870 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 19:15:24,872 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 19:15:24,874 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 19:15:24,879 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 19:15:24,886 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 19:15:24,886 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 19:15:24,887 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 19:15:24,891 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 19:15:24,905 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 19:15:24,906 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 19:15:24,908 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 19:15:24,908 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 19:15:24,909 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 19:15:24,909 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 19:15:24,909 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 19:15:24,909 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 19:15:24,909 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 19:15:24,909 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 19:15:24,910 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 19:15:24,910 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 19:15:24,910 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 19:15:24,910 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 19:15:24,910 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 19:15:24,911 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 19:15:24,911 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 19:15:24,911 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 19:15:24,911 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 19:15:24,911 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 19:15:24,911 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 19:15:24,912 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 19:15:24,912 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 19:15:25,198 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 19:15:25,234 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 19:15:25,236 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 19:15:25,237 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 19:15:25,238 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 19:15:25,239 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/egcd-ll.c [2021-05-02 19:15:25,283 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/38e918eb7/79ba1ab5094e4d5d9a25a34edb2389c5/FLAG945918065 [2021-05-02 19:15:25,637 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 19:15:25,638 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/egcd-ll.c [2021-05-02 19:15:25,643 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/38e918eb7/79ba1ab5094e4d5d9a25a34edb2389c5/FLAG945918065 [2021-05-02 19:15:26,071 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/38e918eb7/79ba1ab5094e4d5d9a25a34edb2389c5 [2021-05-02 19:15:26,073 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 19:15:26,074 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 19:15:26,075 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 19:15:26,075 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 19:15:26,078 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 19:15:26,078 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 07:15:26" (1/1) ... [2021-05-02 19:15:26,079 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@56ed344d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:15:26, skipping insertion in model container [2021-05-02 19:15:26,079 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 07:15:26" (1/1) ... [2021-05-02 19:15:26,083 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 19:15:26,093 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 19:15:26,175 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/egcd-ll.c[489,502] [2021-05-02 19:15:26,185 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 19:15:26,190 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 19:15:26,198 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/egcd-ll.c[489,502] [2021-05-02 19:15:26,205 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 19:15:26,214 INFO L208 MainTranslator]: Completed translation [2021-05-02 19:15:26,214 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:15:26 WrapperNode [2021-05-02 19:15:26,214 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 19:15:26,215 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 19:15:26,215 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 19:15:26,215 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 19:15:26,247 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:15:26" (1/1) ... [2021-05-02 19:15:26,248 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:15:26" (1/1) ... [2021-05-02 19:15:26,265 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:15:26" (1/1) ... [2021-05-02 19:15:26,265 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:15:26" (1/1) ... [2021-05-02 19:15:26,268 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:15:26" (1/1) ... [2021-05-02 19:15:26,276 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:15:26" (1/1) ... [2021-05-02 19:15:26,277 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:15:26" (1/1) ... [2021-05-02 19:15:26,278 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 19:15:26,278 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 19:15:26,278 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 19:15:26,279 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 19:15:26,279 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:15:26" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 19:15:26,365 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 19:15:26,365 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 19:15:26,365 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 19:15:26,365 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 19:15:26,365 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 19:15:26,365 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 19:15:26,366 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 19:15:26,366 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 19:15:26,366 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 19:15:26,366 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 19:15:26,366 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 19:15:26,366 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 19:15:26,366 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 19:15:26,367 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 19:15:26,367 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 19:15:26,367 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 19:15:26,367 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 19:15:26,367 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 19:15:26,368 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 19:15:26,368 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 19:15:26,646 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 19:15:26,646 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 19:15:26,647 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:15:26 BoogieIcfgContainer [2021-05-02 19:15:26,647 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 19:15:26,648 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 19:15:26,648 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 19:15:26,648 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 19:15:26,650 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:15:26" (1/1) ... [2021-05-02 19:15:26,664 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 07:15:26 BasicIcfg [2021-05-02 19:15:26,664 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 19:15:26,665 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 19:15:26,665 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 19:15:26,667 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 19:15:26,667 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 07:15:26" (1/4) ... [2021-05-02 19:15:26,667 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7925390d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 07:15:26, skipping insertion in model container [2021-05-02 19:15:26,668 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:15:26" (2/4) ... [2021-05-02 19:15:26,668 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7925390d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 07:15:26, skipping insertion in model container [2021-05-02 19:15:26,668 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:15:26" (3/4) ... [2021-05-02 19:15:26,668 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7925390d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 07:15:26, skipping insertion in model container [2021-05-02 19:15:26,668 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 07:15:26" (4/4) ... [2021-05-02 19:15:26,669 INFO L111 eAbstractionObserver]: Analyzing ICFG egcd-ll.cJordan [2021-05-02 19:15:26,676 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 19:15:26,679 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 19:15:26,690 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 19:15:26,711 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 19:15:26,711 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 19:15:26,711 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 19:15:26,711 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 19:15:26,711 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 19:15:26,712 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 19:15:26,712 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 19:15:26,712 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 19:15:26,726 INFO L276 IsEmpty]: Start isEmpty. Operand has 34 states, 17 states have (on average 1.411764705882353) internal successors, (24), 18 states have internal predecessors, (24), 11 states have call successors, (11), 4 states have call predecessors, (11), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 19:15:26,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 19:15:26,731 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:15:26,732 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:15:26,732 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:15:26,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:15:26,736 INFO L82 PathProgramCache]: Analyzing trace with hash 589677296, now seen corresponding path program 1 times [2021-05-02 19:15:26,742 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:15:26,742 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [549505949] [2021-05-02 19:15:26,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:15:26,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:15:26,939 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:15:26,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:15:26,953 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 19:15:26,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:15:26,957 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 19:15:26,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:15:26,961 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 19:15:26,962 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:15:26,962 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [549505949] [2021-05-02 19:15:26,962 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [549505949] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:15:26,963 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:15:26,963 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 19:15:26,963 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [297200162] [2021-05-02 19:15:26,966 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 19:15:26,966 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:15:26,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 19:15:26,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 19:15:26,977 INFO L87 Difference]: Start difference. First operand has 34 states, 17 states have (on average 1.411764705882353) internal successors, (24), 18 states have internal predecessors, (24), 11 states have call successors, (11), 4 states have call predecessors, (11), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) 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, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 19:15:27,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:15:27,051 INFO L93 Difference]: Finished difference Result 34 states and 42 transitions. [2021-05-02 19:15:27,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 19:15:27,052 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, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 22 [2021-05-02 19:15:27,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:15:27,057 INFO L225 Difference]: With dead ends: 34 [2021-05-02 19:15:27,058 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 19:15:27,059 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 39.9ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 19:15:27,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 19:15:27,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-05-02 19:15:27,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 11 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 19:15:27,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 37 transitions. [2021-05-02 19:15:27,083 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 37 transitions. Word has length 22 [2021-05-02 19:15:27,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:15:27,083 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 37 transitions. [2021-05-02 19:15:27,083 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, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 19:15:27,083 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 37 transitions. [2021-05-02 19:15:27,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 19:15:27,084 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:15:27,084 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:15:27,085 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 19:15:27,085 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:15:27,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:15:27,085 INFO L82 PathProgramCache]: Analyzing trace with hash -1721458959, now seen corresponding path program 1 times [2021-05-02 19:15:27,086 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:15:27,086 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1598315778] [2021-05-02 19:15:27,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:15:27,099 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:15:27,099 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1765614976] [2021-05-02 19:15:27,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:15:27,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:15:27,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 19:15:27,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:15:27,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:27,365 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 19:15:27,366 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:15:27,366 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1598315778] [2021-05-02 19:15:27,367 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:15:27,367 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1765614976] [2021-05-02 19:15:27,367 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1765614976] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:15:27,367 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:15:27,367 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 19:15:27,367 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154001298] [2021-05-02 19:15:27,369 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 19:15:27,369 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:15:27,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 19:15:27,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-02 19:15:27,371 INFO L87 Difference]: Start difference. First operand 29 states and 37 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 19:15:27,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:15:27,481 INFO L93 Difference]: Finished difference Result 43 states and 58 transitions. [2021-05-02 19:15:27,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 19:15:27,481 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 22 [2021-05-02 19:15:27,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:15:27,483 INFO L225 Difference]: With dead ends: 43 [2021-05-02 19:15:27,484 INFO L226 Difference]: Without dead ends: 43 [2021-05-02 19:15:27,485 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 42.9ms TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-05-02 19:15:27,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-02 19:15:27,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2021-05-02 19:15:27,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 20 states have (on average 1.25) internal successors, (25), 22 states have internal predecessors, (25), 17 states have call successors, (17), 5 states have call predecessors, (17), 4 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2021-05-02 19:15:27,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 57 transitions. [2021-05-02 19:15:27,507 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 57 transitions. Word has length 22 [2021-05-02 19:15:27,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:15:27,508 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 57 transitions. [2021-05-02 19:15:27,508 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 19:15:27,508 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 57 transitions. [2021-05-02 19:15:27,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 19:15:27,510 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:15:27,513 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:15:27,733 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 19:15:27,733 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:15:27,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:15:27,734 INFO L82 PathProgramCache]: Analyzing trace with hash 491128363, now seen corresponding path program 1 times [2021-05-02 19:15:27,734 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:15:27,734 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [411252803] [2021-05-02 19:15:27,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:15:27,748 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:15:27,749 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [766085166] [2021-05-02 19:15:27,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:15:27,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:15:27,819 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 19:15:27,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:15:27,848 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:27,850 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:27,885 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:27,887 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:27,888 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:27,889 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:27,901 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:27,902 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:27,904 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:27,905 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:27,921 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 19:15:27,922 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:15:27,922 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [411252803] [2021-05-02 19:15:27,922 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:15:27,922 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [766085166] [2021-05-02 19:15:27,922 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [766085166] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:15:27,922 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:15:27,922 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-02 19:15:27,922 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717982165] [2021-05-02 19:15:27,923 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 19:15:27,923 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:15:27,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 19:15:27,923 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-02 19:15:27,923 INFO L87 Difference]: Start difference. First operand 42 states and 57 transitions. Second operand has 9 states, 8 states have (on average 1.75) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 19:15:28,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:15:28,010 INFO L93 Difference]: Finished difference Result 65 states and 95 transitions. [2021-05-02 19:15:28,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 19:15:28,011 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.75) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 27 [2021-05-02 19:15:28,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:15:28,013 INFO L225 Difference]: With dead ends: 65 [2021-05-02 19:15:28,013 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 19:15:28,014 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 45.1ms TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 19:15:28,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 19:15:28,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 58. [2021-05-02 19:15:28,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 29 states have (on average 1.3103448275862069) internal successors, (38), 31 states have internal predecessors, (38), 23 states have call successors, (23), 6 states have call predecessors, (23), 5 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2021-05-02 19:15:28,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 82 transitions. [2021-05-02 19:15:28,021 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 82 transitions. Word has length 27 [2021-05-02 19:15:28,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:15:28,022 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 82 transitions. [2021-05-02 19:15:28,022 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 8 states have (on average 1.75) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 19:15:28,022 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 82 transitions. [2021-05-02 19:15:28,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 19:15:28,022 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:15:28,022 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:15:28,240 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:15:28,241 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:15:28,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:15:28,241 INFO L82 PathProgramCache]: Analyzing trace with hash 70646830, now seen corresponding path program 1 times [2021-05-02 19:15:28,241 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:15:28,241 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [930388016] [2021-05-02 19:15:28,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:15:28,253 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:15:28,253 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1446529186] [2021-05-02 19:15:28,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:15:28,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:15:28,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 19:15:28,295 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:15:28,318 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:28,320 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:28,350 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:28,351 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:28,353 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:28,353 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:28,364 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:28,365 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:28,366 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:28,367 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:28,377 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:28,378 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:28,379 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:28,380 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:28,395 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-05-02 19:15:28,395 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:15:28,395 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [930388016] [2021-05-02 19:15:28,395 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:15:28,396 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1446529186] [2021-05-02 19:15:28,396 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1446529186] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:15:28,396 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:15:28,396 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-02 19:15:28,396 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1449947499] [2021-05-02 19:15:28,396 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 19:15:28,396 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:15:28,397 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 19:15:28,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-02 19:15:28,397 INFO L87 Difference]: Start difference. First operand 58 states and 82 transitions. Second operand has 9 states, 8 states have (on average 1.75) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 19:15:28,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:15:28,493 INFO L93 Difference]: Finished difference Result 63 states and 86 transitions. [2021-05-02 19:15:28,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 19:15:28,494 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.75) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) Word has length 32 [2021-05-02 19:15:28,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:15:28,495 INFO L225 Difference]: With dead ends: 63 [2021-05-02 19:15:28,495 INFO L226 Difference]: Without dead ends: 61 [2021-05-02 19:15:28,495 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 41.7ms TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 19:15:28,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-02 19:15:28,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2021-05-02 19:15:28,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 32 states have (on average 1.28125) internal successors, (41), 34 states have internal predecessors, (41), 22 states have call successors, (22), 7 states have call predecessors, (22), 6 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2021-05-02 19:15:28,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 82 transitions. [2021-05-02 19:15:28,500 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 82 transitions. Word has length 32 [2021-05-02 19:15:28,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:15:28,500 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 82 transitions. [2021-05-02 19:15:28,500 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 8 states have (on average 1.75) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 19:15:28,500 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 82 transitions. [2021-05-02 19:15:28,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 19:15:28,501 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:15:28,501 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:15:28,718 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:15:28,718 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:15:28,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:15:28,719 INFO L82 PathProgramCache]: Analyzing trace with hash 399873803, now seen corresponding path program 1 times [2021-05-02 19:15:28,719 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:15:28,719 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [503229457] [2021-05-02 19:15:28,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:15:28,728 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:15:28,728 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2069155500] [2021-05-02 19:15:28,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:15:28,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:15:28,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 19:15:28,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:15:28,838 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 19:15:28,838 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:15:28,838 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [503229457] [2021-05-02 19:15:28,838 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:15:28,838 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2069155500] [2021-05-02 19:15:28,839 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2069155500] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:15:28,839 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:15:28,839 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 19:15:28,839 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [277291017] [2021-05-02 19:15:28,839 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 19:15:28,839 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:15:28,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 19:15:28,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 19:15:28,840 INFO L87 Difference]: Start difference. First operand 61 states and 82 transitions. Second operand has 5 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-05-02 19:15:28,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:15:28,865 INFO L93 Difference]: Finished difference Result 65 states and 85 transitions. [2021-05-02 19:15:28,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 19:15:28,865 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 38 [2021-05-02 19:15:28,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:15:28,866 INFO L225 Difference]: With dead ends: 65 [2021-05-02 19:15:28,866 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 19:15:28,866 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 11.8ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 19:15:28,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 19:15:28,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2021-05-02 19:15:28,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 35 states have (on average 1.2571428571428571) internal successors, (44), 37 states have internal predecessors, (44), 22 states have call successors, (22), 8 states have call predecessors, (22), 7 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2021-05-02 19:15:28,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 85 transitions. [2021-05-02 19:15:28,870 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 85 transitions. Word has length 38 [2021-05-02 19:15:28,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:15:28,871 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 85 transitions. [2021-05-02 19:15:28,871 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-05-02 19:15:28,871 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 85 transitions. [2021-05-02 19:15:28,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 19:15:28,871 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:15:28,872 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:15:29,090 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:15:29,090 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:15:29,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:15:29,091 INFO L82 PathProgramCache]: Analyzing trace with hash -898902600, now seen corresponding path program 1 times [2021-05-02 19:15:29,091 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:15:29,091 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1362727250] [2021-05-02 19:15:29,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:15:29,100 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:15:29,100 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [275756353] [2021-05-02 19:15:29,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:15:29,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:15:29,177 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 19:15:29,179 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:15:29,197 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:29,258 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 19:15:29,258 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:15:29,258 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1362727250] [2021-05-02 19:15:29,259 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:15:29,259 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [275756353] [2021-05-02 19:15:29,259 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [275756353] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:15:29,259 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:15:29,259 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 19:15:29,259 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [825880358] [2021-05-02 19:15:29,259 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 19:15:29,259 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:15:29,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 19:15:29,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-02 19:15:29,260 INFO L87 Difference]: Start difference. First operand 65 states and 85 transitions. Second operand has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-05-02 19:15:29,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:15:29,312 INFO L93 Difference]: Finished difference Result 79 states and 101 transitions. [2021-05-02 19:15:29,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 19:15:29,312 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 40 [2021-05-02 19:15:29,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:15:29,313 INFO L225 Difference]: With dead ends: 79 [2021-05-02 19:15:29,314 INFO L226 Difference]: Without dead ends: 79 [2021-05-02 19:15:29,314 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 31.2ms TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-05-02 19:15:29,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-05-02 19:15:29,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2021-05-02 19:15:29,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 41 states have (on average 1.2195121951219512) internal successors, (50), 44 states have internal predecessors, (50), 25 states have call successors, (25), 10 states have call predecessors, (25), 9 states have return successors, (22), 21 states have call predecessors, (22), 22 states have call successors, (22) [2021-05-02 19:15:29,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 97 transitions. [2021-05-02 19:15:29,319 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 97 transitions. Word has length 40 [2021-05-02 19:15:29,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:15:29,319 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 97 transitions. [2021-05-02 19:15:29,319 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-05-02 19:15:29,319 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 97 transitions. [2021-05-02 19:15:29,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 19:15:29,320 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:15:29,320 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:15:29,539 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-02 19:15:29,540 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:15:29,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:15:29,540 INFO L82 PathProgramCache]: Analyzing trace with hash -2093519850, now seen corresponding path program 1 times [2021-05-02 19:15:29,540 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:15:29,540 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [323292304] [2021-05-02 19:15:29,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:15:29,569 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:15:29,570 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1552296943] [2021-05-02 19:15:29,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:15:29,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:15:29,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 19:15:29,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:15:29,740 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:29,742 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:29,759 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 15 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 19:15:29,759 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:15:29,759 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [323292304] [2021-05-02 19:15:29,760 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:15:29,760 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1552296943] [2021-05-02 19:15:29,760 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1552296943] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:15:29,760 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:15:29,760 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 19:15:29,760 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [638675463] [2021-05-02 19:15:29,760 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 19:15:29,760 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:15:29,761 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 19:15:29,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-02 19:15:29,761 INFO L87 Difference]: Start difference. First operand 76 states and 97 transitions. Second operand has 9 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 19:15:29,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:15:29,853 INFO L93 Difference]: Finished difference Result 83 states and 105 transitions. [2021-05-02 19:15:29,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 19:15:29,853 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 43 [2021-05-02 19:15:29,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:15:29,854 INFO L225 Difference]: With dead ends: 83 [2021-05-02 19:15:29,854 INFO L226 Difference]: Without dead ends: 81 [2021-05-02 19:15:29,855 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 49.0ms TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-05-02 19:15:29,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-05-02 19:15:29,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2021-05-02 19:15:29,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 45 states have (on average 1.1555555555555554) internal successors, (52), 48 states have internal predecessors, (52), 25 states have call successors, (25), 11 states have call predecessors, (25), 10 states have return successors, (23), 21 states have call predecessors, (23), 23 states have call successors, (23) [2021-05-02 19:15:29,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 100 transitions. [2021-05-02 19:15:29,860 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 100 transitions. Word has length 43 [2021-05-02 19:15:29,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:15:29,860 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 100 transitions. [2021-05-02 19:15:29,860 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 19:15:29,860 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 100 transitions. [2021-05-02 19:15:29,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 19:15:29,861 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:15:29,861 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:15:30,078 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:15:30,078 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:15:30,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:15:30,078 INFO L82 PathProgramCache]: Analyzing trace with hash 1560297731, now seen corresponding path program 1 times [2021-05-02 19:15:30,079 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:15:30,079 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [707833172] [2021-05-02 19:15:30,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:15:30,089 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:15:30,089 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [358971248] [2021-05-02 19:15:30,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:15:30,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:15:30,154 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 19:15:30,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:15:30,179 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:30,180 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:30,213 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:30,214 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:30,215 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:30,215 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:30,224 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:30,225 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:30,226 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:30,227 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:30,254 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:30,255 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:30,256 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:30,257 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:30,290 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:30,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:30,302 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:30,304 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:30,322 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 10 proven. 10 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-05-02 19:15:30,322 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:15:30,323 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [707833172] [2021-05-02 19:15:30,323 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:15:30,323 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [358971248] [2021-05-02 19:15:30,323 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [358971248] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:15:30,323 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:15:30,323 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 19:15:30,323 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [671683530] [2021-05-02 19:15:30,323 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 19:15:30,323 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:15:30,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 19:15:30,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2021-05-02 19:15:30,324 INFO L87 Difference]: Start difference. First operand 81 states and 100 transitions. Second operand has 12 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 9 states have internal predecessors, (20), 4 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) [2021-05-02 19:15:30,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:15:30,525 INFO L93 Difference]: Finished difference Result 113 states and 140 transitions. [2021-05-02 19:15:30,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 19:15:30,525 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 9 states have internal predecessors, (20), 4 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) Word has length 45 [2021-05-02 19:15:30,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:15:30,526 INFO L225 Difference]: With dead ends: 113 [2021-05-02 19:15:30,526 INFO L226 Difference]: Without dead ends: 113 [2021-05-02 19:15:30,526 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 85.6ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-02 19:15:30,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-05-02 19:15:30,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 109. [2021-05-02 19:15:30,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 63 states have (on average 1.1587301587301588) internal successors, (73), 66 states have internal predecessors, (73), 31 states have call successors, (31), 15 states have call predecessors, (31), 14 states have return successors, (29), 27 states have call predecessors, (29), 29 states have call successors, (29) [2021-05-02 19:15:30,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 133 transitions. [2021-05-02 19:15:30,532 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 133 transitions. Word has length 45 [2021-05-02 19:15:30,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:15:30,533 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 133 transitions. [2021-05-02 19:15:30,533 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 9 states have internal predecessors, (20), 4 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) [2021-05-02 19:15:30,533 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 133 transitions. [2021-05-02 19:15:30,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 19:15:30,533 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:15:30,534 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:15:30,750 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:15:30,750 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:15:30,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:15:30,751 INFO L82 PathProgramCache]: Analyzing trace with hash -738679243, now seen corresponding path program 2 times [2021-05-02 19:15:30,751 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:15:30,751 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1301869973] [2021-05-02 19:15:30,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:15:30,758 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:15:30,758 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1014358489] [2021-05-02 19:15:30,758 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 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:15:30,817 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 19:15:30,818 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:15:30,819 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 45 conjunts are in the unsatisfiable core [2021-05-02 19:15:30,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:15:30,843 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:30,845 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:30,869 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:30,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:30,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:30,883 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:30,892 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:30,893 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:30,940 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:30,941 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:30,950 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:30,952 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:30,974 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:30,975 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:30,993 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 23 proven. 12 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-05-02 19:15:30,993 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:15:30,993 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1301869973] [2021-05-02 19:15:30,993 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:15:30,993 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1014358489] [2021-05-02 19:15:30,994 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1014358489] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:15:30,994 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:15:30,994 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 19:15:30,994 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1259832399] [2021-05-02 19:15:30,994 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 19:15:30,994 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:15:30,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 19:15:30,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2021-05-02 19:15:30,995 INFO L87 Difference]: Start difference. First operand 109 states and 133 transitions. Second operand has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 5 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-02 19:15:31,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:15:31,239 INFO L93 Difference]: Finished difference Result 141 states and 178 transitions. [2021-05-02 19:15:31,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 19:15:31,239 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 5 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) Word has length 50 [2021-05-02 19:15:31,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:15:31,241 INFO L225 Difference]: With dead ends: 141 [2021-05-02 19:15:31,241 INFO L226 Difference]: Without dead ends: 136 [2021-05-02 19:15:31,241 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 89.1ms TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-02 19:15:31,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-05-02 19:15:31,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 136. [2021-05-02 19:15:31,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 78 states have (on average 1.1666666666666667) internal successors, (91), 82 states have internal predecessors, (91), 40 states have call successors, (40), 18 states have call predecessors, (40), 17 states have return successors, (37), 35 states have call predecessors, (37), 37 states have call successors, (37) [2021-05-02 19:15:31,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 168 transitions. [2021-05-02 19:15:31,255 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 168 transitions. Word has length 50 [2021-05-02 19:15:31,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:15:31,255 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 168 transitions. [2021-05-02 19:15:31,256 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 5 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-02 19:15:31,256 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 168 transitions. [2021-05-02 19:15:31,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-02 19:15:31,257 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:15:31,257 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:15:31,477 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-05-02 19:15:31,478 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:15:31,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:15:31,478 INFO L82 PathProgramCache]: Analyzing trace with hash 1002568160, now seen corresponding path program 1 times [2021-05-02 19:15:31,478 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:15:31,478 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [910301077] [2021-05-02 19:15:31,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:15:31,486 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:15:31,486 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1447214375] [2021-05-02 19:15:31,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:15:31,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:15:31,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 19:15:31,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:15:31,611 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:31,613 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:31,629 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:31,686 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:31,690 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:31,718 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:31,720 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:31,731 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:31,734 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:31,744 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:31,745 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:31,771 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:31,773 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:31,810 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 12 proven. 13 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-05-02 19:15:31,810 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:15:31,810 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [910301077] [2021-05-02 19:15:31,810 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:15:31,810 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1447214375] [2021-05-02 19:15:31,810 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1447214375] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:15:31,811 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:15:31,811 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 19:15:31,811 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1638574818] [2021-05-02 19:15:31,811 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 19:15:31,811 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:15:31,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 19:15:31,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-05-02 19:15:31,812 INFO L87 Difference]: Start difference. First operand 136 states and 168 transitions. Second operand has 10 states, 10 states have (on average 2.3) internal successors, (23), 8 states have internal predecessors, (23), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-02 19:15:31,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:15:31,968 INFO L93 Difference]: Finished difference Result 154 states and 192 transitions. [2021-05-02 19:15:31,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 19:15:31,969 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.3) internal successors, (23), 8 states have internal predecessors, (23), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) Word has length 58 [2021-05-02 19:15:31,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:15:31,970 INFO L225 Difference]: With dead ends: 154 [2021-05-02 19:15:31,970 INFO L226 Difference]: Without dead ends: 154 [2021-05-02 19:15:31,970 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 84.6ms TimeCoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2021-05-02 19:15:31,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2021-05-02 19:15:31,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 152. [2021-05-02 19:15:31,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 86 states have (on average 1.1627906976744187) internal successors, (100), 91 states have internal predecessors, (100), 46 states have call successors, (46), 20 states have call predecessors, (46), 19 states have return successors, (43), 40 states have call predecessors, (43), 43 states have call successors, (43) [2021-05-02 19:15:31,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 189 transitions. [2021-05-02 19:15:31,976 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 189 transitions. Word has length 58 [2021-05-02 19:15:31,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:15:31,977 INFO L480 AbstractCegarLoop]: Abstraction has 152 states and 189 transitions. [2021-05-02 19:15:31,977 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.3) internal successors, (23), 8 states have internal predecessors, (23), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-02 19:15:31,977 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 189 transitions. [2021-05-02 19:15:31,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-02 19:15:31,977 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:15:31,978 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:15:32,196 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:15:32,196 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:15:32,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:15:32,197 INFO L82 PathProgramCache]: Analyzing trace with hash 906932256, now seen corresponding path program 2 times [2021-05-02 19:15:32,197 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:15:32,197 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1363189773] [2021-05-02 19:15:32,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:15:32,215 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:15:32,215 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1635384244] [2021-05-02 19:15:32,215 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:15:32,265 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 19:15:32,266 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:15:32,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 32 conjunts are in the unsatisfiable core [2021-05-02 19:15:32,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:15:32,319 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:32,320 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:32,327 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:32,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:32,376 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:32,393 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:32,394 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:32,402 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:32,403 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:32,411 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:32,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:32,421 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:32,423 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:32,459 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 12 proven. 13 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-05-02 19:15:32,459 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:15:32,459 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1363189773] [2021-05-02 19:15:32,459 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:15:32,459 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1635384244] [2021-05-02 19:15:32,459 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1635384244] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:15:32,460 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:15:32,460 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 19:15:32,460 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1151276474] [2021-05-02 19:15:32,460 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 19:15:32,460 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:15:32,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 19:15:32,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2021-05-02 19:15:32,461 INFO L87 Difference]: Start difference. First operand 152 states and 189 transitions. Second operand has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-02 19:15:32,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:15:32,635 INFO L93 Difference]: Finished difference Result 165 states and 208 transitions. [2021-05-02 19:15:32,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 19:15:32,635 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), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) Word has length 58 [2021-05-02 19:15:32,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:15:32,636 INFO L225 Difference]: With dead ends: 165 [2021-05-02 19:15:32,636 INFO L226 Difference]: Without dead ends: 162 [2021-05-02 19:15:32,636 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 117.6ms TimeCoverageRelationStatistics Valid=46, Invalid=226, Unknown=0, NotChecked=0, Total=272 [2021-05-02 19:15:32,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2021-05-02 19:15:32,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 161. [2021-05-02 19:15:32,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 91 states have (on average 1.1538461538461537) internal successors, (105), 96 states have internal predecessors, (105), 49 states have call successors, (49), 21 states have call predecessors, (49), 20 states have return successors, (46), 43 states have call predecessors, (46), 46 states have call successors, (46) [2021-05-02 19:15:32,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 200 transitions. [2021-05-02 19:15:32,642 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 200 transitions. Word has length 58 [2021-05-02 19:15:32,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:15:32,642 INFO L480 AbstractCegarLoop]: Abstraction has 161 states and 200 transitions. [2021-05-02 19:15:32,643 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), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-02 19:15:32,643 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 200 transitions. [2021-05-02 19:15:32,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 19:15:32,644 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:15:32,644 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:15:32,863 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:15:32,865 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:15:32,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:15:32,866 INFO L82 PathProgramCache]: Analyzing trace with hash 69367259, now seen corresponding path program 2 times [2021-05-02 19:15:32,866 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:15:32,866 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [554364672] [2021-05-02 19:15:32,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:15:32,872 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:15:32,872 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1634615525] [2021-05-02 19:15:32,872 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:15:32,924 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 19:15:32,925 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:15:32,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 41 conjunts are in the unsatisfiable core [2021-05-02 19:15:32,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:15:32,947 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:32,948 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:32,976 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:32,977 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:32,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:32,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:32,986 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:32,987 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:32,988 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:32,988 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:32,996 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:32,997 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:32,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:32,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,049 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,050 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,052 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,060 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,061 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,062 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,062 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,106 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,107 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,108 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,108 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,142 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,143 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,144 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,144 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,154 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,156 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,178 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 25 proven. 19 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-05-02 19:15:33,178 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:15:33,178 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [554364672] [2021-05-02 19:15:33,178 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:15:33,178 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1634615525] [2021-05-02 19:15:33,178 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1634615525] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:15:33,179 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:15:33,179 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-05-02 19:15:33,179 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [619169392] [2021-05-02 19:15:33,179 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 19:15:33,179 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:15:33,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 19:15:33,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-02 19:15:33,180 INFO L87 Difference]: Start difference. First operand 161 states and 200 transitions. Second operand has 14 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 11 states have internal predecessors, (23), 6 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (10), 7 states have call predecessors, (10), 6 states have call successors, (10) [2021-05-02 19:15:33,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:15:33,393 INFO L93 Difference]: Finished difference Result 189 states and 237 transitions. [2021-05-02 19:15:33,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 19:15:33,393 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 11 states have internal predecessors, (23), 6 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (10), 7 states have call predecessors, (10), 6 states have call successors, (10) Word has length 63 [2021-05-02 19:15:33,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:15:33,395 INFO L225 Difference]: With dead ends: 189 [2021-05-02 19:15:33,395 INFO L226 Difference]: Without dead ends: 189 [2021-05-02 19:15:33,395 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 137.1ms TimeCoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2021-05-02 19:15:33,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2021-05-02 19:15:33,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 185. [2021-05-02 19:15:33,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 106 states have (on average 1.1603773584905661) internal successors, (123), 111 states have internal predecessors, (123), 55 states have call successors, (55), 24 states have call predecessors, (55), 23 states have return successors, (52), 49 states have call predecessors, (52), 52 states have call successors, (52) [2021-05-02 19:15:33,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 230 transitions. [2021-05-02 19:15:33,403 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 230 transitions. Word has length 63 [2021-05-02 19:15:33,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:15:33,403 INFO L480 AbstractCegarLoop]: Abstraction has 185 states and 230 transitions. [2021-05-02 19:15:33,403 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 11 states have internal predecessors, (23), 6 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (10), 7 states have call predecessors, (10), 6 states have call successors, (10) [2021-05-02 19:15:33,403 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 230 transitions. [2021-05-02 19:15:33,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 19:15:33,404 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:15:33,404 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:15:33,622 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-02 19:15:33,622 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:15:33,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:15:33,623 INFO L82 PathProgramCache]: Analyzing trace with hash 762468956, now seen corresponding path program 3 times [2021-05-02 19:15:33,623 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:15:33,623 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [348846832] [2021-05-02 19:15:33,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:15:33,631 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:15:33,631 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1516675203] [2021-05-02 19:15:33,631 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:15:33,737 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 19:15:33,737 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:15:33,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-02 19:15:33,740 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:15:33,760 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,761 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,782 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,782 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,790 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,791 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,800 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,825 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,826 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,835 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,842 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,843 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,904 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,906 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,907 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,918 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:33,962 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 28 proven. 19 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2021-05-02 19:15:33,963 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:15:33,963 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [348846832] [2021-05-02 19:15:33,963 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:15:33,963 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1516675203] [2021-05-02 19:15:33,963 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1516675203] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:15:33,963 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:15:33,963 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-02 19:15:33,963 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [212796510] [2021-05-02 19:15:33,964 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 19:15:33,964 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:15:33,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 19:15:33,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2021-05-02 19:15:33,964 INFO L87 Difference]: Start difference. First operand 185 states and 230 transitions. Second operand has 13 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 5 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (10), 6 states have call predecessors, (10), 5 states have call successors, (10) [2021-05-02 19:15:34,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:15:34,168 INFO L93 Difference]: Finished difference Result 208 states and 259 transitions. [2021-05-02 19:15:34,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 19:15:34,168 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 5 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (10), 6 states have call predecessors, (10), 5 states have call successors, (10) Word has length 63 [2021-05-02 19:15:34,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:15:34,169 INFO L225 Difference]: With dead ends: 208 [2021-05-02 19:15:34,169 INFO L226 Difference]: Without dead ends: 208 [2021-05-02 19:15:34,170 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 100.4ms TimeCoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-05-02 19:15:34,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2021-05-02 19:15:34,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 194. [2021-05-02 19:15:34,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 113 states have (on average 1.1592920353982301) internal successors, (131), 118 states have internal predecessors, (131), 55 states have call successors, (55), 26 states have call predecessors, (55), 25 states have return successors, (52), 49 states have call predecessors, (52), 52 states have call successors, (52) [2021-05-02 19:15:34,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 238 transitions. [2021-05-02 19:15:34,176 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 238 transitions. Word has length 63 [2021-05-02 19:15:34,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:15:34,176 INFO L480 AbstractCegarLoop]: Abstraction has 194 states and 238 transitions. [2021-05-02 19:15:34,176 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 5 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (10), 6 states have call predecessors, (10), 5 states have call successors, (10) [2021-05-02 19:15:34,176 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 238 transitions. [2021-05-02 19:15:34,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-02 19:15:34,177 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:15:34,177 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:15:34,397 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 19:15:34,397 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:15:34,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:15:34,397 INFO L82 PathProgramCache]: Analyzing trace with hash 2125314141, now seen corresponding path program 4 times [2021-05-02 19:15:34,397 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:15:34,398 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1658198134] [2021-05-02 19:15:34,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:15:34,415 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:15:34,415 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1922469192] [2021-05-02 19:15:34,415 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 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:15:34,493 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 19:15:34,493 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:15:34,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 49 conjunts are in the unsatisfiable core [2021-05-02 19:15:34,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:15:34,518 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:34,519 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:34,548 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:34,550 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:34,557 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:34,557 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:34,582 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:34,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:34,613 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:34,615 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:34,625 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:34,626 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:34,634 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:34,635 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:34,681 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:34,682 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:34,691 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:34,692 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:34,722 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:34,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:34,741 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 35 proven. 34 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 19:15:34,741 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:15:34,741 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1658198134] [2021-05-02 19:15:34,741 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:15:34,741 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1922469192] [2021-05-02 19:15:34,741 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1922469192] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:15:34,741 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:15:34,741 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-02 19:15:34,741 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [138182696] [2021-05-02 19:15:34,742 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 19:15:34,742 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:15:34,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 19:15:34,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2021-05-02 19:15:34,742 INFO L87 Difference]: Start difference. First operand 194 states and 238 transitions. Second operand has 13 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 10 states have internal predecessors, (26), 6 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (11), 6 states have call predecessors, (11), 5 states have call successors, (11) [2021-05-02 19:15:35,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:15:35,061 INFO L93 Difference]: Finished difference Result 214 states and 265 transitions. [2021-05-02 19:15:35,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 19:15:35,061 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 10 states have internal predecessors, (26), 6 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (11), 6 states have call predecessors, (11), 5 states have call successors, (11) Word has length 68 [2021-05-02 19:15:35,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:15:35,063 INFO L225 Difference]: With dead ends: 214 [2021-05-02 19:15:35,063 INFO L226 Difference]: Without dead ends: 209 [2021-05-02 19:15:35,063 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 126.3ms TimeCoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-05-02 19:15:35,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2021-05-02 19:15:35,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 172. [2021-05-02 19:15:35,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 102 states have (on average 1.1470588235294117) internal successors, (117), 106 states have internal predecessors, (117), 46 states have call successors, (46), 24 states have call predecessors, (46), 23 states have return successors, (43), 41 states have call predecessors, (43), 43 states have call successors, (43) [2021-05-02 19:15:35,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 206 transitions. [2021-05-02 19:15:35,069 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 206 transitions. Word has length 68 [2021-05-02 19:15:35,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:15:35,069 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 206 transitions. [2021-05-02 19:15:35,070 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 10 states have internal predecessors, (26), 6 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (11), 6 states have call predecessors, (11), 5 states have call successors, (11) [2021-05-02 19:15:35,070 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 206 transitions. [2021-05-02 19:15:35,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-02 19:15:35,070 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:15:35,070 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:15:35,288 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 19:15:35,288 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:15:35,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:15:35,289 INFO L82 PathProgramCache]: Analyzing trace with hash -1144161156, now seen corresponding path program 3 times [2021-05-02 19:15:35,289 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:15:35,289 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [873594416] [2021-05-02 19:15:35,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:15:35,295 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:15:35,296 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [932378823] [2021-05-02 19:15:35,296 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 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:15:35,377 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 19:15:35,378 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:15:35,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-02 19:15:35,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:15:35,401 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:35,402 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:35,424 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:35,425 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:35,433 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:35,434 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:35,441 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:35,442 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:35,469 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:35,470 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:35,478 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:35,479 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:35,487 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:35,487 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:35,533 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:35,534 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:35,541 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:35,542 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:35,550 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:35,551 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:15:35,569 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 30 proven. 24 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-05-02 19:15:35,569 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:15:35,569 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [873594416] [2021-05-02 19:15:35,569 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:15:35,569 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [932378823] [2021-05-02 19:15:35,569 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [932378823] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:15:35,569 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:15:35,569 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 19:15:35,570 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1035593851] [2021-05-02 19:15:35,570 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 19:15:35,570 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:15:35,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 19:15:35,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2021-05-02 19:15:35,571 INFO L87 Difference]: Start difference. First operand 172 states and 206 transitions. Second operand has 12 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 10 states have internal predecessors, (26), 5 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2021-05-02 19:15:35,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:15:35,811 INFO L93 Difference]: Finished difference Result 195 states and 244 transitions. [2021-05-02 19:15:35,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 19:15:35,812 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 10 states have internal predecessors, (26), 5 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) Word has length 68 [2021-05-02 19:15:35,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:15:35,813 INFO L225 Difference]: With dead ends: 195 [2021-05-02 19:15:35,813 INFO L226 Difference]: Without dead ends: 191 [2021-05-02 19:15:35,813 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 91.6ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-02 19:15:35,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-05-02 19:15:35,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 188. [2021-05-02 19:15:35,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 188 states, 111 states have (on average 1.162162162162162) internal successors, (129), 115 states have internal predecessors, (129), 52 states have call successors, (52), 25 states have call predecessors, (52), 24 states have return successors, (49), 47 states have call predecessors, (49), 49 states have call successors, (49) [2021-05-02 19:15:35,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 230 transitions. [2021-05-02 19:15:35,820 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 230 transitions. Word has length 68 [2021-05-02 19:15:35,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:15:35,820 INFO L480 AbstractCegarLoop]: Abstraction has 188 states and 230 transitions. [2021-05-02 19:15:35,821 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 10 states have internal predecessors, (26), 5 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2021-05-02 19:15:35,821 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 230 transitions. [2021-05-02 19:15:35,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-02 19:15:35,821 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:15:35,821 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 9, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:15:36,041 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:15:36,042 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:15:36,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:15:36,042 INFO L82 PathProgramCache]: Analyzing trace with hash 1542874120, now seen corresponding path program 5 times [2021-05-02 19:15:36,042 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:15:36,042 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1153349756] [2021-05-02 19:15:36,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:15:36,048 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:15:36,048 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [109123240] [2021-05-02 19:15:36,049 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true