/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/ps4-ll.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 19:25:27,861 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 19:25:27,862 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 19:25:27,886 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 19:25:27,886 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 19:25:27,887 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 19:25:27,888 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 19:25:27,900 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 19:25:27,901 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 19:25:27,902 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 19:25:27,903 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 19:25:27,904 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 19:25:27,904 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 19:25:27,905 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 19:25:27,906 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 19:25:27,907 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 19:25:27,907 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 19:25:27,908 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 19:25:27,910 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 19:25:27,911 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 19:25:27,913 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 19:25:27,914 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 19:25:27,917 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 19:25:27,918 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 19:25:27,925 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 19:25:27,932 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 19:25:27,933 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 19:25:27,933 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 19:25:27,940 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 19:25:27,967 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 19:25:27,967 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 19:25:27,970 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 19:25:27,970 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 19:25:27,970 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 19:25:27,970 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 19:25:27,970 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 19:25:27,970 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 19:25:27,970 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 19:25:27,971 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 19:25:27,971 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 19:25:27,971 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 19:25:27,972 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 19:25:27,972 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 19:25:27,972 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 19:25:27,972 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 19:25:27,972 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 19:25:27,972 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 19:25:27,972 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 19:25:27,973 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 19:25:27,973 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 19:25:27,974 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 19:25:27,974 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 19:25:28,283 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 19:25:28,308 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 19:25:28,310 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 19:25:28,311 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 19:25:28,311 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 19:25:28,312 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/ps4-ll.c [2021-05-02 19:25:28,375 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2690bd6dd/465f9eb0a50b4b69ab3d788702948293/FLAG4c9531c15 [2021-05-02 19:25:28,777 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 19:25:28,777 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/ps4-ll.c [2021-05-02 19:25:28,783 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2690bd6dd/465f9eb0a50b4b69ab3d788702948293/FLAG4c9531c15 [2021-05-02 19:25:29,204 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2690bd6dd/465f9eb0a50b4b69ab3d788702948293 [2021-05-02 19:25:29,207 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 19:25:29,209 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 19:25:29,227 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 19:25:29,227 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 19:25:29,231 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 19:25:29,232 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 07:25:29" (1/1) ... [2021-05-02 19:25:29,233 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@442ed9ab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:25:29, skipping insertion in model container [2021-05-02 19:25:29,233 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 07:25:29" (1/1) ... [2021-05-02 19:25:29,253 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 19:25:29,281 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 19:25:29,397 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/ps4-ll.c[458,471] [2021-05-02 19:25:29,408 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 19:25:29,415 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 19:25:29,458 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/ps4-ll.c[458,471] [2021-05-02 19:25:29,463 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 19:25:29,487 INFO L208 MainTranslator]: Completed translation [2021-05-02 19:25:29,487 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:25:29 WrapperNode [2021-05-02 19:25:29,487 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 19:25:29,488 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 19:25:29,488 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 19:25:29,489 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 19:25:29,497 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:25:29" (1/1) ... [2021-05-02 19:25:29,497 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:25:29" (1/1) ... [2021-05-02 19:25:29,502 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:25:29" (1/1) ... [2021-05-02 19:25:29,502 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:25:29" (1/1) ... [2021-05-02 19:25:29,506 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:25:29" (1/1) ... [2021-05-02 19:25:29,509 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:25:29" (1/1) ... [2021-05-02 19:25:29,510 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:25:29" (1/1) ... [2021-05-02 19:25:29,511 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 19:25:29,512 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 19:25:29,512 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 19:25:29,512 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 19:25:29,513 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:25:29" (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 19:25:29,588 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 19:25:29,588 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 19:25:29,588 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 19:25:29,588 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 19:25:29,588 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 19:25:29,589 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 19:25:29,589 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 19:25:29,589 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 19:25:29,589 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 19:25:29,590 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 19:25:29,590 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2021-05-02 19:25:29,590 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 19:25:29,590 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 19:25:29,590 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 19:25:29,591 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 19:25:29,591 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 19:25:29,591 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 19:25:29,591 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 19:25:29,592 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 19:25:29,592 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 19:25:29,872 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 19:25:29,872 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 19:25:29,873 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:25:29 BoogieIcfgContainer [2021-05-02 19:25:29,873 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 19:25:29,874 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 19:25:29,874 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 19:25:29,875 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 19:25:29,877 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:25:29" (1/1) ... [2021-05-02 19:25:29,890 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 07:25:29 BasicIcfg [2021-05-02 19:25:29,890 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 19:25:29,891 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 19:25:29,891 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 19:25:29,893 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 19:25:29,894 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 07:25:29" (1/4) ... [2021-05-02 19:25:29,894 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b8fb342 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 07:25:29, skipping insertion in model container [2021-05-02 19:25:29,894 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:25:29" (2/4) ... [2021-05-02 19:25:29,895 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b8fb342 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 07:25:29, skipping insertion in model container [2021-05-02 19:25:29,895 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:25:29" (3/4) ... [2021-05-02 19:25:29,895 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b8fb342 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 07:25:29, skipping insertion in model container [2021-05-02 19:25:29,895 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 07:25:29" (4/4) ... [2021-05-02 19:25:29,896 INFO L111 eAbstractionObserver]: Analyzing ICFG ps4-ll.cJordan [2021-05-02 19:25:29,900 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 19:25:29,903 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 19:25:29,916 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 19:25:29,931 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 19:25:29,931 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 19:25:29,931 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 19:25:29,931 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 19:25:29,932 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 19:25:29,932 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 19:25:29,932 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 19:25:29,932 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 19:25:29,958 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 19:25:29,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 19:25:29,964 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:25:29,964 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:25:29,965 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:25:29,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:25:29,969 INFO L82 PathProgramCache]: Analyzing trace with hash 1382868560, now seen corresponding path program 1 times [2021-05-02 19:25:29,979 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:25:29,980 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1179009623] [2021-05-02 19:25:29,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:25:30,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:25:30,189 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:25:30,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:25:30,202 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:25:30,202 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:25:30,202 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1179009623] [2021-05-02 19:25:30,203 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1179009623] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:25:30,203 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:25:30,203 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 19:25:30,204 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1446800289] [2021-05-02 19:25:30,208 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 19:25:30,208 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:25:30,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 19:25:30,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 19:25:30,220 INFO L87 Difference]: Start difference. First operand has 22 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:25:30,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:25:30,302 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2021-05-02 19:25:30,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 19:25:30,305 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 19:25:30,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:25:30,310 INFO L225 Difference]: With dead ends: 22 [2021-05-02 19:25:30,310 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 19:25:30,312 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 48.2ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 19:25:30,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 19:25:30,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-02 19:25:30,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 10 states have internal predecessors, (11), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 19:25:30,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-05-02 19:25:30,339 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 11 [2021-05-02 19:25:30,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:25:30,340 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-05-02 19:25:30,340 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:25:30,340 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-05-02 19:25:30,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 19:25:30,341 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:25:30,341 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:25:30,341 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 19:25:30,341 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:25:30,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:25:30,343 INFO L82 PathProgramCache]: Analyzing trace with hash 1384745393, now seen corresponding path program 1 times [2021-05-02 19:25:30,343 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:25:30,343 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1545168173] [2021-05-02 19:25:30,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:25:30,370 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:25:30,371 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [688113264] [2021-05-02 19:25:30,371 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 19:25:30,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:25:30,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 19:25:30,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:25:30,582 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:25:30,582 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:25:30,582 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1545168173] [2021-05-02 19:25:30,582 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:25:30,583 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [688113264] [2021-05-02 19:25:30,583 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [688113264] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:25:30,583 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:25:30,583 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 19:25:30,583 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1704555852] [2021-05-02 19:25:30,584 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 19:25:30,584 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:25:30,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 19:25:30,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 19:25:30,585 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:25:30,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:25:30,620 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2021-05-02 19:25:30,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 19:25:30,621 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 19:25:30,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:25:30,621 INFO L225 Difference]: With dead ends: 26 [2021-05-02 19:25:30,622 INFO L226 Difference]: Without dead ends: 24 [2021-05-02 19:25:30,622 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 20.3ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 19:25:30,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-02 19:25:30,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-05-02 19:25:30,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 15 states have internal predecessors, (16), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 19:25:30,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2021-05-02 19:25:30,628 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 11 [2021-05-02 19:25:30,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:25:30,628 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2021-05-02 19:25:30,628 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:25:30,628 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2021-05-02 19:25:30,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 19:25:30,629 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:25:30,629 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:25:30,851 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 19:25:30,852 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:25:30,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:25:30,852 INFO L82 PathProgramCache]: Analyzing trace with hash -803685984, now seen corresponding path program 1 times [2021-05-02 19:25:30,852 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:25:30,853 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [348844486] [2021-05-02 19:25:30,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:25:30,862 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:25:30,862 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [92116645] [2021-05-02 19:25:30,862 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 19:25:30,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:25:30,912 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 19:25:30,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:25:31,023 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:25:31,023 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:25:31,024 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [348844486] [2021-05-02 19:25:31,024 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:25:31,024 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [92116645] [2021-05-02 19:25:31,024 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [92116645] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:25:31,024 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:25:31,024 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 19:25:31,024 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178398850] [2021-05-02 19:25:31,025 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 19:25:31,025 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:25:31,025 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 19:25:31,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-02 19:25:31,026 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 8 states, 8 states have (on average 1.5) internal successors, (12), 7 states have internal predecessors, (12), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 19:25:37,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:25:37,194 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2021-05-02 19:25:37,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 19:25:37,194 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.5) internal successors, (12), 7 states have internal predecessors, (12), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 18 [2021-05-02 19:25:37,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:25:37,195 INFO L225 Difference]: With dead ends: 33 [2021-05-02 19:25:37,195 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 19:25:37,196 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 60.7ms TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-05-02 19:25:37,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 19:25:37,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 19:25:37,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 21 states have internal predecessors, (22), 8 states have call successors, (8), 5 states have call predecessors, (8), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 19:25:37,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2021-05-02 19:25:37,201 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 18 [2021-05-02 19:25:37,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:25:37,201 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2021-05-02 19:25:37,202 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 1.5) internal successors, (12), 7 states have internal predecessors, (12), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 19:25:37,202 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2021-05-02 19:25:37,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 19:25:37,202 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:25:37,202 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:25:37,421 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:25:37,421 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:25:37,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:25:37,422 INFO L82 PathProgramCache]: Analyzing trace with hash 842365436, now seen corresponding path program 1 times [2021-05-02 19:25:37,422 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:25:37,422 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1498869051] [2021-05-02 19:25:37,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:25:37,431 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:25:37,431 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1217239055] [2021-05-02 19:25:37,432 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 19:25:37,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:25:37,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 19:25:37,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:25:37,566 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:25:37,569 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:25:37,706 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:25:37,707 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:25:37,709 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:25:37,711 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:25:37,712 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:25:37,713 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:25:37,731 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:25:40,226 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:25:40,251 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:25:40,255 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:25:40,265 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:25:40,300 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 19:25:40,300 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:25:40,301 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1498869051] [2021-05-02 19:25:40,301 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:25:40,301 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1217239055] [2021-05-02 19:25:40,301 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1217239055] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:25:40,301 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:25:40,301 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 19:25:40,302 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1557605201] [2021-05-02 19:25:40,302 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 19:25:40,302 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:25:40,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 19:25:40,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=87, Unknown=1, NotChecked=0, Total=110 [2021-05-02 19:25:40,303 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand has 11 states, 10 states have (on average 1.3) internal successors, (13), 8 states have internal predecessors, (13), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 19:25:40,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:25:40,439 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2021-05-02 19:25:40,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 19:25:40,440 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.3) internal successors, (13), 8 states have internal predecessors, (13), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 24 [2021-05-02 19:25:40,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:25:40,441 INFO L225 Difference]: With dead ends: 36 [2021-05-02 19:25:40,441 INFO L226 Difference]: Without dead ends: 31 [2021-05-02 19:25:40,441 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 2636.2ms TimeCoverageRelationStatistics Valid=38, Invalid=143, Unknown=1, NotChecked=0, Total=182 [2021-05-02 19:25:40,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-02 19:25:40,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-05-02 19:25:40,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 19 states have (on average 1.105263157894737) internal successors, (21), 20 states have internal predecessors, (21), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 19:25:40,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2021-05-02 19:25:40,446 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 24 [2021-05-02 19:25:40,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:25:40,446 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2021-05-02 19:25:40,447 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 1.3) internal successors, (13), 8 states have internal predecessors, (13), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 19:25:40,447 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2021-05-02 19:25:40,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 19:25:40,447 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:25:40,448 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:25:40,665 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:25:40,665 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:25:40,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:25:40,666 INFO L82 PathProgramCache]: Analyzing trace with hash 371166929, now seen corresponding path program 2 times [2021-05-02 19:25:40,666 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:25:40,666 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1800188911] [2021-05-02 19:25:40,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:25:40,676 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:25:40,676 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1382184537] [2021-05-02 19:25:40,676 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:25:40,743 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 19:25:40,743 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:25:40,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 19:25:40,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:25:40,930 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 19:25:40,930 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:25:40,930 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1800188911] [2021-05-02 19:25:40,930 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:25:40,931 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1382184537] [2021-05-02 19:25:40,931 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1382184537] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:25:40,931 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:25:40,931 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 19:25:40,931 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [796839770] [2021-05-02 19:25:40,931 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 19:25:40,932 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:25:40,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 19:25:40,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-02 19:25:40,932 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 8 states have internal predecessors, (17), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 19:25:43,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:25:43,078 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2021-05-02 19:25:43,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 19:25:43,078 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 8 states have internal predecessors, (17), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 25 [2021-05-02 19:25:43,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:25:43,079 INFO L225 Difference]: With dead ends: 40 [2021-05-02 19:25:43,079 INFO L226 Difference]: Without dead ends: 39 [2021-05-02 19:25:43,080 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 139.3ms TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-05-02 19:25:43,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-02 19:25:43,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2021-05-02 19:25:43,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 24 states have (on average 1.125) internal successors, (27), 26 states have internal predecessors, (27), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 19:25:43,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2021-05-02 19:25:43,084 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 25 [2021-05-02 19:25:43,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:25:43,085 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2021-05-02 19:25:43,085 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 8 states have internal predecessors, (17), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 19:25:43,085 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2021-05-02 19:25:43,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 19:25:43,085 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:25:43,086 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:25:43,296 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:25:43,297 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:25:43,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:25:43,297 INFO L82 PathProgramCache]: Analyzing trace with hash 186246765, now seen corresponding path program 2 times [2021-05-02 19:25:43,297 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:25:43,298 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [264741882] [2021-05-02 19:25:43,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:25:43,306 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:25:43,306 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2142913961] [2021-05-02 19:25:43,306 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 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 19:25:43,378 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 19:25:43,379 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:25:43,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-02 19:25:43,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:25:43,429 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:25:43,487 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:25:43,487 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:25:43,493 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:25:43,495 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:25:43,508 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:25:43,526 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:25:43,530 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:25:43,536 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:25:43,565 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 5 proven. 16 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 19:25:43,565 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:25:43,565 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [264741882] [2021-05-02 19:25:43,565 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:25:43,565 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2142913961] [2021-05-02 19:25:43,566 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2142913961] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:25:43,566 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:25:43,566 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 19:25:43,566 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [892156057] [2021-05-02 19:25:43,566 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 19:25:43,566 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:25:43,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 19:25:43,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-05-02 19:25:43,567 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand has 10 states, 9 states have (on average 2.0) internal successors, (18), 9 states have internal predecessors, (18), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 19:25:43,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:25:43,705 INFO L93 Difference]: Finished difference Result 43 states and 45 transitions. [2021-05-02 19:25:43,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 19:25:43,706 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.0) internal successors, (18), 9 states have internal predecessors, (18), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 31 [2021-05-02 19:25:43,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:25:43,707 INFO L225 Difference]: With dead ends: 43 [2021-05-02 19:25:43,707 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 19:25:43,708 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 106.1ms TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-02 19:25:43,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 19:25:43,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-05-02 19:25:43,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 24 states have (on average 1.0833333333333333) internal successors, (26), 25 states have internal predecessors, (26), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 19:25:43,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2021-05-02 19:25:43,713 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 31 [2021-05-02 19:25:43,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:25:43,714 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2021-05-02 19:25:43,714 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 2.0) internal successors, (18), 9 states have internal predecessors, (18), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 19:25:43,714 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2021-05-02 19:25:43,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 19:25:43,715 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:25:43,715 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:25:43,916 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 19:25:43,917 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:25:43,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:25:43,917 INFO L82 PathProgramCache]: Analyzing trace with hash 1506324608, now seen corresponding path program 3 times [2021-05-02 19:25:43,918 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:25:43,918 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1017774115] [2021-05-02 19:25:43,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:25:43,925 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:25:43,926 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1896153050] [2021-05-02 19:25:43,926 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 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