/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-scaling/bresenham-ll_valuebound1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 19:30:19,122 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 19:30:19,123 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 19:30:19,142 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 19:30:19,142 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 19:30:19,143 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 19:30:19,144 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 19:30:19,145 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 19:30:19,146 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 19:30:19,147 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 19:30:19,147 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 19:30:19,148 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 19:30:19,148 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 19:30:19,149 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 19:30:19,149 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 19:30:19,150 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 19:30:19,151 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 19:30:19,151 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 19:30:19,152 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 19:30:19,153 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 19:30:19,154 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 19:30:19,155 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 19:30:19,156 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 19:30:19,156 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 19:30:19,161 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 19:30:19,167 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 19:30:19,167 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 19:30:19,168 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 19:30:19,175 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 19:30:19,187 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 19:30:19,187 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 19:30:19,190 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 19:30:19,190 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 19:30:19,190 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 19:30:19,190 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 19:30:19,191 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 19:30:19,191 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 19:30:19,191 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 19:30:19,191 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 19:30:19,192 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 19:30:19,192 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 19:30:19,192 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 19:30:19,192 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 19:30:19,192 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 19:30:19,192 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 19:30:19,192 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 19:30:19,192 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 19:30:19,193 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 19:30:19,193 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 19:30:19,193 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 19:30:19,194 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 19:30:19,194 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 19:30:19,491 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 19:30:19,509 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 19:30:19,510 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 19:30:19,511 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 19:30:19,513 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 19:30:19,514 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/bresenham-ll_valuebound1.c [2021-05-02 19:30:19,568 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c60b5e66c/1166c1d20eeb444ca749b911e8eb38ca/FLAGb555b6c76 [2021-05-02 19:30:19,924 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 19:30:19,924 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/bresenham-ll_valuebound1.c [2021-05-02 19:30:19,929 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c60b5e66c/1166c1d20eeb444ca749b911e8eb38ca/FLAGb555b6c76 [2021-05-02 19:30:19,947 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c60b5e66c/1166c1d20eeb444ca749b911e8eb38ca [2021-05-02 19:30:19,949 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 19:30:19,951 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 19:30:19,957 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 19:30:19,957 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 19:30:19,960 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 19:30:19,960 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 07:30:19" (1/1) ... [2021-05-02 19:30:19,961 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@13d1fe38 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:30:19, skipping insertion in model container [2021-05-02 19:30:19,961 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 07:30:19" (1/1) ... [2021-05-02 19:30:19,966 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 19:30:19,977 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 19:30:20,097 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/bresenham-ll_valuebound1.c[597,610] [2021-05-02 19:30:20,129 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 19:30:20,135 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 19:30:20,159 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/bresenham-ll_valuebound1.c[597,610] [2021-05-02 19:30:20,195 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 19:30:20,204 INFO L208 MainTranslator]: Completed translation [2021-05-02 19:30:20,204 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:30:20 WrapperNode [2021-05-02 19:30:20,204 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 19:30:20,209 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 19:30:20,209 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 19:30:20,209 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 19:30:20,217 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:30:20" (1/1) ... [2021-05-02 19:30:20,217 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:30:20" (1/1) ... [2021-05-02 19:30:20,224 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:30:20" (1/1) ... [2021-05-02 19:30:20,224 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:30:20" (1/1) ... [2021-05-02 19:30:20,233 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:30:20" (1/1) ... [2021-05-02 19:30:20,237 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:30:20" (1/1) ... [2021-05-02 19:30:20,241 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:30:20" (1/1) ... [2021-05-02 19:30:20,244 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 19:30:20,245 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 19:30:20,245 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 19:30:20,246 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 19:30:20,247 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:30:20" (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 19:30:20,311 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 19:30:20,311 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 19:30:20,311 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 19:30:20,311 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 19:30:20,311 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 19:30:20,311 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 19:30:20,312 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 19:30:20,312 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 19:30:20,312 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 19:30:20,312 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 19:30:20,312 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 19:30:20,312 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 19:30:20,312 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 19:30:20,313 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 19:30:20,313 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 19:30:20,313 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 19:30:20,313 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 19:30:20,313 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 19:30:20,313 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 19:30:20,314 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 19:30:20,566 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 19:30:20,566 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 19:30:20,567 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:30:20 BoogieIcfgContainer [2021-05-02 19:30:20,567 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 19:30:20,571 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 19:30:20,571 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 19:30:20,572 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 19:30:20,575 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:30:20" (1/1) ... [2021-05-02 19:30:20,597 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 07:30:20 BasicIcfg [2021-05-02 19:30:20,597 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 19:30:20,598 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 19:30:20,598 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 19:30:20,600 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 19:30:20,605 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 07:30:19" (1/4) ... [2021-05-02 19:30:20,606 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b77e78d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 07:30:20, skipping insertion in model container [2021-05-02 19:30:20,607 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:30:20" (2/4) ... [2021-05-02 19:30:20,607 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b77e78d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 07:30:20, skipping insertion in model container [2021-05-02 19:30:20,607 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:30:20" (3/4) ... [2021-05-02 19:30:20,609 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b77e78d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 07:30:20, skipping insertion in model container [2021-05-02 19:30:20,609 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 07:30:20" (4/4) ... [2021-05-02 19:30:20,610 INFO L111 eAbstractionObserver]: Analyzing ICFG bresenham-ll_valuebound1.cJordan [2021-05-02 19:30:20,614 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 19:30:20,617 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 19:30:20,628 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 19:30:20,650 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 19:30:20,650 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 19:30:20,650 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 19:30:20,650 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 19:30:20,650 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 19:30:20,650 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 19:30:20,650 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 19:30:20,650 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 19:30:20,663 INFO L276 IsEmpty]: Start isEmpty. Operand has 32 states, 20 states have (on average 1.35) internal successors, (27), 21 states have internal predecessors, (27), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 19:30:20,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 19:30:20,669 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:30:20,669 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:30:20,670 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:30:20,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:30:20,674 INFO L82 PathProgramCache]: Analyzing trace with hash -1563578423, now seen corresponding path program 1 times [2021-05-02 19:30:20,679 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:30:20,680 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [866309804] [2021-05-02 19:30:20,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:30:20,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:30:20,844 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:30:20,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:30:20,856 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 19:30:20,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:30:20,863 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-05-02 19:30:20,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:30:20,874 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 19:30:20,875 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:30:20,875 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [866309804] [2021-05-02 19:30:20,876 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [866309804] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:30:20,876 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:30:20,877 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 19:30:20,877 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542543826] [2021-05-02 19:30:20,880 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 19:30:20,880 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:30:20,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 19:30:20,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 19:30:20,892 INFO L87 Difference]: Start difference. First operand has 32 states, 20 states have (on average 1.35) internal successors, (27), 21 states have internal predecessors, (27), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 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 19:30:20,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:30:20,965 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2021-05-02 19:30:20,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 19:30:20,967 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 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 23 [2021-05-02 19:30:20,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:30:20,972 INFO L225 Difference]: With dead ends: 32 [2021-05-02 19:30:20,972 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 19:30:20,974 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 25.5ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 19:30:20,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 19:30:20,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-05-02 19:30:20,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 18 states have internal predecessors, (20), 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 19:30:20,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2021-05-02 19:30:21,000 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 23 [2021-05-02 19:30:21,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:30:21,000 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2021-05-02 19:30:21,000 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 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 19:30:21,001 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2021-05-02 19:30:21,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 19:30:21,002 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:30:21,002 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:30:21,002 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 19:30:21,003 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:30:21,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:30:21,004 INFO L82 PathProgramCache]: Analyzing trace with hash -1863481077, now seen corresponding path program 1 times [2021-05-02 19:30:21,004 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:30:21,004 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1299933264] [2021-05-02 19:30:21,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:30:21,036 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:30:21,036 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [965034441] [2021-05-02 19:30:21,037 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 19:30:21,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:30:21,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 19:30:21,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:30:21,227 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:21,245 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:21,330 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:21,340 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:21,372 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 19:30:21,373 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:30:21,373 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1299933264] [2021-05-02 19:30:21,373 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:30:21,373 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [965034441] [2021-05-02 19:30:21,373 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [965034441] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:30:21,373 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:30:21,373 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 19:30:21,373 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2025754519] [2021-05-02 19:30:21,374 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 19:30:21,374 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:30:21,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 19:30:21,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-02 19:30:21,375 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand has 9 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 19:30:21,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:30:21,504 INFO L93 Difference]: Finished difference Result 35 states and 39 transitions. [2021-05-02 19:30:21,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 19:30:21,504 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2021-05-02 19:30:21,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:30:21,506 INFO L225 Difference]: With dead ends: 35 [2021-05-02 19:30:21,506 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 19:30:21,506 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 94.6ms TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-05-02 19:30:21,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 19:30:21,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2021-05-02 19:30:21,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 23 states have internal predecessors, (25), 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 19:30:21,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2021-05-02 19:30:21,510 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 23 [2021-05-02 19:30:21,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:30:21,511 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2021-05-02 19:30:21,511 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 19:30:21,511 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2021-05-02 19:30:21,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 19:30:21,512 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:30:21,512 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:30:21,713 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 19:30:21,713 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:30:21,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:30:21,713 INFO L82 PathProgramCache]: Analyzing trace with hash -646008129, now seen corresponding path program 1 times [2021-05-02 19:30:21,714 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:30:21,714 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1481819797] [2021-05-02 19:30:21,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:30:21,722 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:30:21,723 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [380531082] [2021-05-02 19:30:21,723 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 19:30:21,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:30:21,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 19:30:21,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:30:21,827 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:21,829 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:21,891 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:21,895 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:22,015 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:22,018 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:22,037 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:22,064 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 19:30:22,064 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:30:22,064 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1481819797] [2021-05-02 19:30:22,064 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:30:22,064 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [380531082] [2021-05-02 19:30:22,064 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [380531082] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:30:22,064 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:30:22,065 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 19:30:22,065 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700487590] [2021-05-02 19:30:22,065 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 19:30:22,065 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:30:22,066 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 19:30:22,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-05-02 19:30:22,068 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand has 11 states, 10 states have (on average 1.9) internal successors, (19), 9 states have internal predecessors, (19), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 19:30:22,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:30:22,228 INFO L93 Difference]: Finished difference Result 48 states and 53 transitions. [2021-05-02 19:30:22,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 19:30:22,229 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.9) internal successors, (19), 9 states have internal predecessors, (19), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 32 [2021-05-02 19:30:22,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:30:22,229 INFO L225 Difference]: With dead ends: 48 [2021-05-02 19:30:22,229 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 19:30:22,230 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 137.9ms TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2021-05-02 19:30:22,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 19:30:22,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-05-02 19:30:22,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 24 states have internal predecessors, (26), 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 19:30:22,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 38 transitions. [2021-05-02 19:30:22,233 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 38 transitions. Word has length 32 [2021-05-02 19:30:22,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:30:22,233 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 38 transitions. [2021-05-02 19:30:22,234 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 1.9) internal successors, (19), 9 states have internal predecessors, (19), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 19:30:22,234 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 38 transitions. [2021-05-02 19:30:22,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 19:30:22,234 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:30:22,235 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:30:22,449 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:30:22,449 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:30:22,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:30:22,450 INFO L82 PathProgramCache]: Analyzing trace with hash 241495552, now seen corresponding path program 1 times [2021-05-02 19:30:22,450 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:30:22,450 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [195873109] [2021-05-02 19:30:22,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:30:22,460 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:30:22,460 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1781983435] [2021-05-02 19:30:22,460 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 19:30:22,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:30:22,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-02 19:30:22,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:30:22,574 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:22,576 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:22,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:22,636 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:22,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:22,761 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:22,782 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 19:30:22,782 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:30:22,782 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [195873109] [2021-05-02 19:30:22,782 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:30:22,782 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1781983435] [2021-05-02 19:30:22,783 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1781983435] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:30:22,783 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:30:22,783 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 19:30:22,783 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304298438] [2021-05-02 19:30:22,783 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 19:30:22,783 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:30:22,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 19:30:22,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-05-02 19:30:22,784 INFO L87 Difference]: Start difference. First operand 35 states and 38 transitions. Second operand has 12 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 states have internal predecessors, (19), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 19:30:22,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:30:22,978 INFO L93 Difference]: Finished difference Result 46 states and 50 transitions. [2021-05-02 19:30:22,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 19:30:22,979 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 states have internal predecessors, (19), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 32 [2021-05-02 19:30:22,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:30:22,980 INFO L225 Difference]: With dead ends: 46 [2021-05-02 19:30:22,980 INFO L226 Difference]: Without dead ends: 46 [2021-05-02 19:30:22,981 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 164.1ms TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-02 19:30:22,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-02 19:30:22,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 44. [2021-05-02 19:30:22,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 31 states have internal predecessors, (34), 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 19:30:22,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2021-05-02 19:30:22,984 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 32 [2021-05-02 19:30:22,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:30:22,985 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2021-05-02 19:30:22,985 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 states have internal predecessors, (19), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 19:30:22,985 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2021-05-02 19:30:22,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 19:30:22,986 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:30:22,986 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 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, 1, 1] [2021-05-02 19:30:23,200 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:30:23,201 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:30:23,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:30:23,201 INFO L82 PathProgramCache]: Analyzing trace with hash -1661983408, now seen corresponding path program 1 times [2021-05-02 19:30:23,202 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:30:23,202 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [504388982] [2021-05-02 19:30:23,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:30:23,212 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:30:23,212 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1208407815] [2021-05-02 19:30:23,212 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 19:30:23,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:30:23,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 19:30:23,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:30:23,295 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:23,296 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:23,320 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:23,321 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:23,382 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:23,385 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:23,488 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:23,489 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:23,492 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:23,514 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 19:30:23,515 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:30:23,515 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [504388982] [2021-05-02 19:30:23,515 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:30:23,515 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1208407815] [2021-05-02 19:30:23,515 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1208407815] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:30:23,515 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:30:23,515 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-05-02 19:30:23,515 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820027947] [2021-05-02 19:30:23,515 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 19:30:23,516 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:30:23,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 19:30:23,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-02 19:30:23,516 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand has 16 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 19:30:23,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:30:23,764 INFO L93 Difference]: Finished difference Result 50 states and 53 transitions. [2021-05-02 19:30:23,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 19:30:23,770 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 39 [2021-05-02 19:30:23,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:30:23,773 INFO L225 Difference]: With dead ends: 50 [2021-05-02 19:30:23,774 INFO L226 Difference]: Without dead ends: 44 [2021-05-02 19:30:23,775 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 259.8ms TimeCoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-05-02 19:30:23,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-02 19:30:23,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-05-02 19:30:23,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 30 states have (on average 1.1) internal successors, (33), 31 states have internal predecessors, (33), 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 19:30:23,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2021-05-02 19:30:23,784 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 39 [2021-05-02 19:30:23,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:30:23,786 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2021-05-02 19:30:23,786 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 19:30:23,786 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2021-05-02 19:30:23,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 19:30:23,787 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:30:23,787 INFO L523 BasicCegarLoop]: trace histogram [3, 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] [2021-05-02 19:30:24,003 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:30:24,004 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:30:24,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:30:24,004 INFO L82 PathProgramCache]: Analyzing trace with hash 1095191723, now seen corresponding path program 2 times [2021-05-02 19:30:24,004 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:30:24,004 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [902288070] [2021-05-02 19:30:24,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:30:24,019 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 19:30:24,020 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [960500332] [2021-05-02 19:30:24,020 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 19:30:24,073 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 19:30:24,073 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:30:24,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-02 19:30:24,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:30:24,120 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,121 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,144 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,146 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,201 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,202 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,203 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,205 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,424 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,433 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,445 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,449 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,480 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,486 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,495 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,498 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,500 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,501 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,503 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,511 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,516 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,517 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,519 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,520 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,522 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,523 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,525 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,527 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,529 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,532 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,533 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,538 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,543 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,546 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,547 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,549 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,551 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,556 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,563 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:30:24,601 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 13 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 19:30:24,601 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:30:24,601 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [902288070] [2021-05-02 19:30:24,601 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 19:30:24,601 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [960500332] [2021-05-02 19:30:24,601 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [960500332] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:30:24,601 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 19:30:24,602 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2021-05-02 19:30:24,602 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1818360955] [2021-05-02 19:30:24,602 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 19:30:24,602 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:30:24,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 19:30:24,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=261, Unknown=0, NotChecked=0, Total=306 [2021-05-02 19:30:24,603 INFO L87 Difference]: Start difference. First operand 44 states and 47 transitions. Second operand has 18 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 16 states have internal predecessors, (29), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 19:30:25,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:30:25,044 INFO L93 Difference]: Finished difference Result 42 states and 43 transitions. [2021-05-02 19:30:25,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 19:30:25,045 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 16 states have internal predecessors, (29), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 41 [2021-05-02 19:30:25,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:30:25,045 INFO L225 Difference]: With dead ends: 42 [2021-05-02 19:30:25,045 INFO L226 Difference]: Without dead ends: 0 [2021-05-02 19:30:25,045 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 427.9ms TimeCoverageRelationStatistics Valid=80, Invalid=472, Unknown=0, NotChecked=0, Total=552 [2021-05-02 19:30:25,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-02 19:30:25,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-02 19:30:25,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-02 19:30:25,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-02 19:30:25,046 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 41 [2021-05-02 19:30:25,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:30:25,046 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-02 19:30:25,046 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 16 states have internal predecessors, (29), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 19:30:25,046 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-02 19:30:25,046 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-02 19:30:25,247 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:30:25,250 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 07:30:25 BasicIcfg [2021-05-02 19:30:25,250 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 19:30:25,250 INFO L168 Benchmark]: Toolchain (without parser) took 5299.49 ms. Allocated memory was 195.0 MB in the beginning and 293.6 MB in the end (delta: 98.6 MB). Free memory was 161.2 MB in the beginning and 163.0 MB in the end (delta: -1.8 MB). Peak memory consumption was 96.4 MB. Max. memory is 8.0 GB. [2021-05-02 19:30:25,251 INFO L168 Benchmark]: CDTParser took 0.11 ms. Allocated memory is still 195.0 MB. Free memory is still 178.1 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 19:30:25,251 INFO L168 Benchmark]: CACSL2BoogieTranslator took 251.32 ms. Allocated memory is still 195.0 MB. Free memory was 161.0 MB in the beginning and 178.4 MB in the end (delta: -17.5 MB). Peak memory consumption was 11.5 MB. Max. memory is 8.0 GB. [2021-05-02 19:30:25,251 INFO L168 Benchmark]: Boogie Preprocessor took 35.89 ms. Allocated memory is still 195.0 MB. Free memory was 178.4 MB in the beginning and 176.8 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-02 19:30:25,251 INFO L168 Benchmark]: RCFGBuilder took 325.23 ms. Allocated memory is still 195.0 MB. Free memory was 176.8 MB in the beginning and 161.6 MB in the end (delta: 15.2 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. [2021-05-02 19:30:25,251 INFO L168 Benchmark]: IcfgTransformer took 26.20 ms. Allocated memory is still 195.0 MB. Free memory was 161.1 MB in the beginning and 160.1 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-05-02 19:30:25,256 INFO L168 Benchmark]: TraceAbstraction took 4651.92 ms. Allocated memory was 195.0 MB in the beginning and 293.6 MB in the end (delta: 98.6 MB). Free memory was 159.5 MB in the beginning and 163.0 MB in the end (delta: -3.4 MB). Peak memory consumption was 96.2 MB. Max. memory is 8.0 GB. [2021-05-02 19:30:25,257 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.11 ms. Allocated memory is still 195.0 MB. Free memory is still 178.1 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 251.32 ms. Allocated memory is still 195.0 MB. Free memory was 161.0 MB in the beginning and 178.4 MB in the end (delta: -17.5 MB). Peak memory consumption was 11.5 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 35.89 ms. Allocated memory is still 195.0 MB. Free memory was 178.4 MB in the beginning and 176.8 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 325.23 ms. Allocated memory is still 195.0 MB. Free memory was 176.8 MB in the beginning and 161.6 MB in the end (delta: 15.2 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. * IcfgTransformer took 26.20 ms. Allocated memory is still 195.0 MB. Free memory was 161.1 MB in the beginning and 160.1 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * TraceAbstraction took 4651.92 ms. Allocated memory was 195.0 MB in the beginning and 293.6 MB in the end (delta: 98.6 MB). Free memory was 159.5 MB in the beginning and 163.0 MB in the end (delta: -3.4 MB). Peak memory consumption was 96.2 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 16]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 32 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 4599.1ms, OverallIterations: 6, TraceHistogramMax: 3, EmptinessCheckTime: 15.3ms, AutomataDifference: 1287.1ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 7.6ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 130 SDtfs, 160 SDslu, 665 SDs, 0 SdLazy, 913 SolverSat, 65 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 635.1ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 193 GetRequests, 113 SyntacticMatches, 2 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 1109.9ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=44occurred in iteration=4, InterpolantAutomatonStates: 68, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 36.9ms AutomataMinimizationTime, 6 MinimizatonAttempts, 3 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 63.8ms SsaConstructionTime, 152.7ms SatisfiabilityAnalysisTime, 1693.8ms InterpolantComputationTime, 190 NumberOfCodeBlocks, 190 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 184 ConstructedInterpolants, 0 QuantifiedInterpolants, 1347 SizeOfPredicates, 29 NumberOfNonLiveVariables, 707 ConjunctsInSsa, 162 ConjunctsInUnsatCore, 6 InterpolantComputations, 1 PerfectInterpolantSequences, 34/60 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! Received shutdown request...