/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/divbin2_unwindbound100.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 20:02:04,024 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 20:02:04,041 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 20:02:04,087 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 20:02:04,088 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 20:02:04,090 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 20:02:04,092 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 20:02:04,096 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 20:02:04,098 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 20:02:04,101 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 20:02:04,102 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 20:02:04,103 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 20:02:04,103 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 20:02:04,104 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 20:02:04,105 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 20:02:04,106 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 20:02:04,108 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 20:02:04,109 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 20:02:04,114 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 20:02:04,119 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 20:02:04,120 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 20:02:04,122 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 20:02:04,123 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 20:02:04,138 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 20:02:04,158 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 20:02:04,164 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 20:02:04,164 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 20:02:04,165 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 20:02:04,165 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 20:02:04,194 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 20:02:04,194 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 20:02:04,196 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 20:02:04,197 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 20:02:04,197 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 20:02:04,197 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 20:02:04,197 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 20:02:04,197 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 20:02:04,197 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 20:02:04,197 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 20:02:04,198 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 20:02:04,198 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 20:02:04,198 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 20:02:04,198 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 20:02:04,198 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 20:02:04,198 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 20:02:04,199 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 20:02:04,199 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 20:02:04,199 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 20:02:04,199 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 20:02:04,199 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 20:02:04,200 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 20:02:04,200 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 20:02:04,612 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 20:02:04,644 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 20:02:04,647 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 20:02:04,648 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 20:02:04,649 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 20:02:04,650 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/divbin2_unwindbound100.i [2021-05-02 20:02:04,707 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0b4c9026c/7f05ae13621d4c959c052db285991935/FLAG77aa69a96 [2021-05-02 20:02:05,170 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 20:02:05,171 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/divbin2_unwindbound100.i [2021-05-02 20:02:05,176 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0b4c9026c/7f05ae13621d4c959c052db285991935/FLAG77aa69a96 [2021-05-02 20:02:05,673 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0b4c9026c/7f05ae13621d4c959c052db285991935 [2021-05-02 20:02:05,675 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 20:02:05,676 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 20:02:05,713 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 20:02:05,713 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 20:02:05,717 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 20:02:05,726 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 08:02:05" (1/1) ... [2021-05-02 20:02:05,728 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@17784286 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:02:05, skipping insertion in model container [2021-05-02 20:02:05,728 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 08:02:05" (1/1) ... [2021-05-02 20:02:05,734 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 20:02:05,751 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 20:02:05,883 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/divbin2_unwindbound100.i[959,972] [2021-05-02 20:02:05,931 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 20:02:05,936 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 20:02:05,999 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/divbin2_unwindbound100.i[959,972] [2021-05-02 20:02:06,017 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 20:02:06,036 INFO L208 MainTranslator]: Completed translation [2021-05-02 20:02:06,036 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:02:06 WrapperNode [2021-05-02 20:02:06,037 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 20:02:06,037 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 20:02:06,037 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 20:02:06,037 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 20:02:06,047 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:02:06" (1/1) ... [2021-05-02 20:02:06,047 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:02:06" (1/1) ... [2021-05-02 20:02:06,077 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:02:06" (1/1) ... [2021-05-02 20:02:06,078 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:02:06" (1/1) ... [2021-05-02 20:02:06,103 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:02:06" (1/1) ... [2021-05-02 20:02:06,107 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:02:06" (1/1) ... [2021-05-02 20:02:06,112 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:02:06" (1/1) ... [2021-05-02 20:02:06,115 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 20:02:06,116 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 20:02:06,116 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 20:02:06,116 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 20:02:06,117 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:02:06" (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 20:02:06,235 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 20:02:06,235 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 20:02:06,235 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 20:02:06,235 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 20:02:06,244 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 20:02:06,245 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 20:02:06,245 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 20:02:06,245 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 20:02:06,245 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 20:02:06,245 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 20:02:06,245 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 20:02:06,245 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 20:02:06,245 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_int [2021-05-02 20:02:06,246 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 20:02:06,246 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 20:02:06,246 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 20:02:06,246 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 20:02:06,246 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 20:02:06,246 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 20:02:06,246 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 20:02:06,246 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 20:02:06,246 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 20:02:06,572 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 20:02:06,584 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 20:02:06,586 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 08:02:06 BoogieIcfgContainer [2021-05-02 20:02:06,586 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 20:02:06,587 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 20:02:06,587 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 20:02:06,587 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 20:02:06,589 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 08:02:06" (1/1) ... [2021-05-02 20:02:06,616 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 08:02:06 BasicIcfg [2021-05-02 20:02:06,617 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 20:02:06,618 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 20:02:06,618 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 20:02:06,620 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 20:02:06,621 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 08:02:05" (1/4) ... [2021-05-02 20:02:06,621 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6cb65785 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 08:02:06, skipping insertion in model container [2021-05-02 20:02:06,621 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:02:06" (2/4) ... [2021-05-02 20:02:06,621 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6cb65785 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 08:02:06, skipping insertion in model container [2021-05-02 20:02:06,621 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 08:02:06" (3/4) ... [2021-05-02 20:02:06,622 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6cb65785 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 08:02:06, skipping insertion in model container [2021-05-02 20:02:06,622 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 08:02:06" (4/4) ... [2021-05-02 20:02:06,623 INFO L111 eAbstractionObserver]: Analyzing ICFG divbin2_unwindbound100.iJordan [2021-05-02 20:02:06,626 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 20:02:06,629 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 20:02:06,670 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 20:02:06,682 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 20:02:06,682 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 20:02:06,682 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 20:02:06,683 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 20:02:06,683 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 20:02:06,683 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 20:02:06,683 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 20:02:06,683 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 20:02:06,704 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 18 states have internal predecessors, (26), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 20:02:06,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 20:02:06,709 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:02:06,709 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:02:06,709 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:02:06,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:02:06,712 INFO L82 PathProgramCache]: Analyzing trace with hash 2097950667, now seen corresponding path program 1 times [2021-05-02 20:02:06,738 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:02:06,739 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [862870156] [2021-05-02 20:02:06,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:02:06,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:02:07,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 20:02:07,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:02:07,024 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 20:02:07,025 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:02:07,025 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [862870156] [2021-05-02 20:02:07,026 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [862870156] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:02:07,026 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:02:07,026 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 20:02:07,027 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773160699] [2021-05-02 20:02:07,030 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 20:02:07,030 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:02:07,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 20:02:07,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 20:02:07,043 INFO L87 Difference]: Start difference. First operand has 26 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 18 states have internal predecessors, (26), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 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 20:02:07,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:02:07,133 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2021-05-02 20:02:07,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 20:02:07,135 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 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 12 [2021-05-02 20:02:07,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:02:07,142 INFO L225 Difference]: With dead ends: 27 [2021-05-02 20:02:07,142 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 20:02:07,144 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 73.8ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 20:02:07,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 20:02:07,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2021-05-02 20:02:07,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 4 states have call successors, (4), 3 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 20:02:07,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 26 transitions. [2021-05-02 20:02:07,206 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 26 transitions. Word has length 12 [2021-05-02 20:02:07,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:02:07,206 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 26 transitions. [2021-05-02 20:02:07,206 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 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 20:02:07,206 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 26 transitions. [2021-05-02 20:02:07,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 20:02:07,207 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:02:07,207 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:02:07,207 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 20:02:07,207 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:02:07,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:02:07,208 INFO L82 PathProgramCache]: Analyzing trace with hash 923003056, now seen corresponding path program 1 times [2021-05-02 20:02:07,208 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:02:07,221 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [685063448] [2021-05-02 20:02:07,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:02:07,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:02:07,364 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 20:02:07,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:02:07,389 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 20:02:07,389 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:02:07,390 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [685063448] [2021-05-02 20:02:07,390 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [685063448] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:02:07,390 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:02:07,390 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 20:02:07,391 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1566203249] [2021-05-02 20:02:07,392 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 20:02:07,392 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:02:07,398 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 20:02:07,398 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 20:02:07,399 INFO L87 Difference]: Start difference. First operand 21 states and 26 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 3 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 20:02:07,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:02:07,504 INFO L93 Difference]: Finished difference Result 23 states and 28 transitions. [2021-05-02 20:02:07,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 20:02:07,505 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 3 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 14 [2021-05-02 20:02:07,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:02:07,506 INFO L225 Difference]: With dead ends: 23 [2021-05-02 20:02:07,506 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 20:02:07,506 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 69.2ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:02:07,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 20:02:07,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-05-02 20:02:07,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 4 states have call successors, (4), 3 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 20:02:07,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 28 transitions. [2021-05-02 20:02:07,529 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 28 transitions. Word has length 14 [2021-05-02 20:02:07,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:02:07,530 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 28 transitions. [2021-05-02 20:02:07,530 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 3 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 20:02:07,530 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 28 transitions. [2021-05-02 20:02:07,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 20:02:07,531 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:02:07,531 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:02:07,531 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 20:02:07,532 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:02:07,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:02:07,534 INFO L82 PathProgramCache]: Analyzing trace with hash 1207414063, now seen corresponding path program 1 times [2021-05-02 20:02:07,534 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:02:07,535 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1833046087] [2021-05-02 20:02:07,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:02:07,559 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:02:07,560 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [803335785] [2021-05-02 20:02:07,560 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 20:02:07,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:02:07,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 20:02:07,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:02:07,707 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:07,738 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:07,742 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:07,764 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:07,773 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:07,776 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:07,802 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:07,808 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:07,841 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 20:02:07,841 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:02:07,842 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1833046087] [2021-05-02 20:02:07,842 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:02:07,842 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [803335785] [2021-05-02 20:02:07,842 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [803335785] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:02:07,842 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:02:07,842 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 20:02:07,842 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [77803147] [2021-05-02 20:02:07,843 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 20:02:07,843 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:02:07,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 20:02:07,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 20:02:07,844 INFO L87 Difference]: Start difference. First operand 23 states and 28 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 3 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 20:02:07,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:02:07,870 INFO L93 Difference]: Finished difference Result 27 states and 33 transitions. [2021-05-02 20:02:07,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 20:02:07,871 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 3 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 15 [2021-05-02 20:02:07,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:02:07,872 INFO L225 Difference]: With dead ends: 27 [2021-05-02 20:02:07,872 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 20:02:07,873 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 18.3ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 20:02:07,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 20:02:07,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2021-05-02 20:02:07,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 19 states have (on average 1.368421052631579) internal successors, (26), 20 states have internal predecessors, (26), 4 states have call successors, (4), 3 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 20:02:07,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2021-05-02 20:02:07,886 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 15 [2021-05-02 20:02:07,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:02:07,887 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2021-05-02 20:02:07,887 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 3 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 20:02:07,887 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2021-05-02 20:02:07,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 20:02:07,889 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:02:07,889 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:02:08,105 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 20:02:08,105 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:02:08,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:02:08,106 INFO L82 PathProgramCache]: Analyzing trace with hash 1208546121, now seen corresponding path program 1 times [2021-05-02 20:02:08,106 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:02:08,106 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1858944984] [2021-05-02 20:02:08,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:02:08,112 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:02:08,112 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [484085335] [2021-05-02 20:02:08,113 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 20:02:08,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:02:08,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 20:02:08,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:02:08,332 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:08,335 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:08,362 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 20:02:08,363 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:02:08,364 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1858944984] [2021-05-02 20:02:08,364 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:02:08,364 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [484085335] [2021-05-02 20:02:08,364 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [484085335] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:02:08,364 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:02:08,364 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 20:02:08,364 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [11749962] [2021-05-02 20:02:08,364 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 20:02:08,365 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:02:08,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 20:02:08,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:02:08,365 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 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 20:02:08,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:02:08,445 INFO L93 Difference]: Finished difference Result 33 states and 40 transitions. [2021-05-02 20:02:08,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 20:02:08,446 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 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 15 [2021-05-02 20:02:08,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:02:08,446 INFO L225 Difference]: With dead ends: 33 [2021-05-02 20:02:08,446 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 20:02:08,446 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 24.2ms TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 20:02:08,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 20:02:08,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 20:02:08,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 24 states have internal predecessors, (30), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:02:08,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 38 transitions. [2021-05-02 20:02:08,449 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 38 transitions. Word has length 15 [2021-05-02 20:02:08,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:02:08,450 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 38 transitions. [2021-05-02 20:02:08,450 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 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 20:02:08,450 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 38 transitions. [2021-05-02 20:02:08,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 20:02:08,450 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:02:08,450 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:02:08,674 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:02:08,674 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:02:08,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:02:08,691 INFO L82 PathProgramCache]: Analyzing trace with hash 1227316531, now seen corresponding path program 1 times [2021-05-02 20:02:08,692 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:02:08,692 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1235900201] [2021-05-02 20:02:08,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:02:08,699 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:02:08,699 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [363414070] [2021-05-02 20:02:08,699 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 20:02:08,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:02:08,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 20:02:08,765 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:02:08,776 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:08,778 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:08,780 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:08,791 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:08,796 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:08,798 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:08,829 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:08,831 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:08,850 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:02:08,850 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:02:08,850 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1235900201] [2021-05-02 20:02:08,850 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:02:08,850 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [363414070] [2021-05-02 20:02:08,851 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [363414070] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:02:08,851 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:02:08,851 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-02 20:02:08,851 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1434433413] [2021-05-02 20:02:08,851 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 20:02:08,851 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:02:08,852 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 20:02:08,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 20:02:08,852 INFO L87 Difference]: Start difference. First operand 32 states and 38 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 3 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 20:02:08,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:02:08,888 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2021-05-02 20:02:08,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 20:02:08,889 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 3 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 17 [2021-05-02 20:02:08,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:02:08,889 INFO L225 Difference]: With dead ends: 34 [2021-05-02 20:02:08,889 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 20:02:08,890 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 12.3ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:02:08,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 20:02:08,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-02 20:02:08,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 25 states have (on average 1.28) internal successors, (32), 26 states have internal predecessors, (32), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:02:08,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2021-05-02 20:02:08,892 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 17 [2021-05-02 20:02:08,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:02:08,892 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2021-05-02 20:02:08,893 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 3 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 20:02:08,893 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2021-05-02 20:02:08,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 20:02:08,893 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:02:08,893 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:02:09,124 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:02:09,125 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:02:09,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:02:09,125 INFO L82 PathProgramCache]: Analyzing trace with hash 2051197196, now seen corresponding path program 1 times [2021-05-02 20:02:09,125 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:02:09,125 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [392394698] [2021-05-02 20:02:09,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:02:09,132 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:02:09,134 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [197277035] [2021-05-02 20:02:09,134 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 20:02:09,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:02:09,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 20:02:09,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:02:09,245 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:09,248 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:09,249 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:09,259 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:09,265 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:09,266 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:09,294 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:09,297 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:09,297 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:09,309 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:09,311 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:09,323 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:02:09,324 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:02:09,324 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [392394698] [2021-05-02 20:02:09,324 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:02:09,324 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [197277035] [2021-05-02 20:02:09,324 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [197277035] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:02:09,324 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:02:09,324 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 20:02:09,324 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [833733738] [2021-05-02 20:02:09,325 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 20:02:09,325 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:02:09,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 20:02:09,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:02:09,325 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 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 20:02:09,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:02:09,374 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2021-05-02 20:02:09,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 20:02:09,374 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 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 18 [2021-05-02 20:02:09,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:02:09,376 INFO L225 Difference]: With dead ends: 39 [2021-05-02 20:02:09,376 INFO L226 Difference]: Without dead ends: 39 [2021-05-02 20:02:09,377 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 16.1ms TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-05-02 20:02:09,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-02 20:02:09,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2021-05-02 20:02:09,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 29 states have (on average 1.3103448275862069) internal successors, (38), 30 states have internal predecessors, (38), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:02:09,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2021-05-02 20:02:09,382 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 18 [2021-05-02 20:02:09,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:02:09,382 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2021-05-02 20:02:09,382 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 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 20:02:09,382 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2021-05-02 20:02:09,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 20:02:09,383 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:02:09,383 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:02:09,600 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:02:09,601 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:02:09,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:02:09,601 INFO L82 PathProgramCache]: Analyzing trace with hash 2052329254, now seen corresponding path program 1 times [2021-05-02 20:02:09,601 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:02:09,601 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1305941517] [2021-05-02 20:02:09,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:02:09,608 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:02:09,608 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [933791448] [2021-05-02 20:02:09,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:02:09,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:02:09,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 20:02:09,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:02:09,791 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:09,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:09,840 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:02:09,840 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:02:09,840 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1305941517] [2021-05-02 20:02:09,840 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:02:09,840 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [933791448] [2021-05-02 20:02:09,840 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [933791448] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:02:09,840 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:02:09,840 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 20:02:09,841 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [91005765] [2021-05-02 20:02:09,841 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 20:02:09,841 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:02:09,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 20:02:09,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:02:09,841 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 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 20:02:09,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:02:09,918 INFO L93 Difference]: Finished difference Result 50 states and 61 transitions. [2021-05-02 20:02:09,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 20:02:09,918 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 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 18 [2021-05-02 20:02:09,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:02:09,919 INFO L225 Difference]: With dead ends: 50 [2021-05-02 20:02:09,919 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 20:02:09,919 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 55.5ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-02 20:02:09,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 20:02:09,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2021-05-02 20:02:09,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 35 states have (on average 1.2571428571428571) internal successors, (44), 36 states have internal predecessors, (44), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 20:02:09,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2021-05-02 20:02:09,922 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 18 [2021-05-02 20:02:09,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:02:09,922 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2021-05-02 20:02:09,922 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 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 20:02:09,922 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2021-05-02 20:02:09,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 20:02:09,923 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:02:09,923 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:02:10,139 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 20:02:10,139 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:02:10,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:02:10,140 INFO L82 PathProgramCache]: Analyzing trace with hash 462666167, now seen corresponding path program 1 times [2021-05-02 20:02:10,140 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:02:10,140 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1123078978] [2021-05-02 20:02:10,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:02:10,145 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:02:10,146 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1109490973] [2021-05-02 20:02:10,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:02:10,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:02:10,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 20:02:10,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:02:10,348 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:02:10,348 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:02:10,348 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1123078978] [2021-05-02 20:02:10,348 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:02:10,350 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1109490973] [2021-05-02 20:02:10,350 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1109490973] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:02:10,350 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:02:10,350 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 20:02:10,351 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1889556973] [2021-05-02 20:02:10,351 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 20:02:10,351 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:02:10,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 20:02:10,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 20:02:10,352 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:02:10,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:02:10,377 INFO L93 Difference]: Finished difference Result 43 states and 49 transitions. [2021-05-02 20:02:10,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 20:02:10,378 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 24 [2021-05-02 20:02:10,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:02:10,378 INFO L225 Difference]: With dead ends: 43 [2021-05-02 20:02:10,378 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 20:02:10,378 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.0ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 20:02:10,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 20:02:10,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-05-02 20:02:10,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 27 states have internal predecessors, (33), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:02:10,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 41 transitions. [2021-05-02 20:02:10,381 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 41 transitions. Word has length 24 [2021-05-02 20:02:10,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:02:10,381 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 41 transitions. [2021-05-02 20:02:10,381 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:02:10,381 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 41 transitions. [2021-05-02 20:02:10,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 20:02:10,381 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:02:10,381 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:02:10,597 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:02:10,597 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:02:10,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:02:10,598 INFO L82 PathProgramCache]: Analyzing trace with hash -269721504, now seen corresponding path program 1 times [2021-05-02 20:02:10,598 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:02:10,598 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1664716091] [2021-05-02 20:02:10,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:02:10,604 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:02:10,604 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1968907508] [2021-05-02 20:02:10,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:02:10,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:02:10,727 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 20:02:10,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:02:10,742 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:10,748 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:10,752 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:10,761 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:10,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:10,774 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:10,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:10,805 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:10,806 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:10,865 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:10,872 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:10,875 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:10,909 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:10,911 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:10,922 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:02:10,922 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:02:10,922 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1664716091] [2021-05-02 20:02:10,922 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:02:10,922 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1968907508] [2021-05-02 20:02:10,922 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1968907508] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:02:10,922 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:02:10,922 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 20:02:10,923 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [445911986] [2021-05-02 20:02:10,923 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 20:02:10,924 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:02:10,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 20:02:10,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 20:02:10,924 INFO L87 Difference]: Start difference. First operand 35 states and 41 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (4), 4 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 20:02:11,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:02:11,005 INFO L93 Difference]: Finished difference Result 53 states and 63 transitions. [2021-05-02 20:02:11,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 20:02:11,006 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (4), 4 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 27 [2021-05-02 20:02:11,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:02:11,006 INFO L225 Difference]: With dead ends: 53 [2021-05-02 20:02:11,006 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 20:02:11,006 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 47.1ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 20:02:11,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 20:02:11,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 47. [2021-05-02 20:02:11,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 36 states have (on average 1.25) internal successors, (45), 37 states have internal predecessors, (45), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 20:02:11,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2021-05-02 20:02:11,016 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 27 [2021-05-02 20:02:11,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:02:11,016 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2021-05-02 20:02:11,016 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (4), 4 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 20:02:11,016 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2021-05-02 20:02:11,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 20:02:11,017 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:02:11,017 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] [2021-05-02 20:02:11,233 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:02:11,233 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:02:11,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:02:11,233 INFO L82 PathProgramCache]: Analyzing trace with hash -268589446, now seen corresponding path program 1 times [2021-05-02 20:02:11,234 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:02:11,234 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1591716459] [2021-05-02 20:02:11,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:02:11,286 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:02:11,286 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1947603187] [2021-05-02 20:02:11,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:02:11,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:02:11,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 20:02:11,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:02:11,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:11,495 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:11,609 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:11,611 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:11,636 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:02:11,636 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:02:11,636 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1591716459] [2021-05-02 20:02:11,636 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:02:11,636 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1947603187] [2021-05-02 20:02:11,636 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1947603187] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:02:11,636 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:02:11,636 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 20:02:11,637 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2133252026] [2021-05-02 20:02:11,637 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 20:02:11,637 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:02:11,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 20:02:11,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-05-02 20:02:11,638 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 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 20:02:11,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:02:11,875 INFO L93 Difference]: Finished difference Result 62 states and 71 transitions. [2021-05-02 20:02:11,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 20:02:11,876 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 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 27 [2021-05-02 20:02:11,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:02:11,877 INFO L225 Difference]: With dead ends: 62 [2021-05-02 20:02:11,877 INFO L226 Difference]: Without dead ends: 61 [2021-05-02 20:02:11,878 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 125.2ms TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-02 20:02:11,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-02 20:02:11,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53. [2021-05-02 20:02:11,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 40 states have (on average 1.225) internal successors, (49), 41 states have internal predecessors, (49), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 20:02:11,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 61 transitions. [2021-05-02 20:02:11,887 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 61 transitions. Word has length 27 [2021-05-02 20:02:11,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:02:11,888 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 61 transitions. [2021-05-02 20:02:11,888 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 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 20:02:11,888 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 61 transitions. [2021-05-02 20:02:11,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 20:02:11,888 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:02:11,888 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:02:12,109 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 20:02:12,109 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:02:12,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:02:12,110 INFO L82 PathProgramCache]: Analyzing trace with hash -1346351076, now seen corresponding path program 1 times [2021-05-02 20:02:12,110 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:02:12,110 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [872028792] [2021-05-02 20:02:12,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:02:12,117 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:02:12,117 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [390191436] [2021-05-02 20:02:12,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:02:12,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:02:12,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 20:02:12,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:02:12,257 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:12,258 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:12,259 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:12,263 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:12,264 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:12,265 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:12,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:12,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:12,287 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:12,307 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:12,310 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:12,348 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 20:02:12,349 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:02:12,349 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [872028792] [2021-05-02 20:02:12,349 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:02:12,349 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [390191436] [2021-05-02 20:02:12,349 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [390191436] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:02:12,349 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:02:12,349 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 20:02:12,349 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1811551021] [2021-05-02 20:02:12,349 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 20:02:12,349 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:02:12,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 20:02:12,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:02:12,350 INFO L87 Difference]: Start difference. First operand 53 states and 61 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (4), 3 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 20:02:12,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:02:12,378 INFO L93 Difference]: Finished difference Result 55 states and 63 transitions. [2021-05-02 20:02:12,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 20:02:12,379 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (4), 3 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 29 [2021-05-02 20:02:12,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:02:12,384 INFO L225 Difference]: With dead ends: 55 [2021-05-02 20:02:12,384 INFO L226 Difference]: Without dead ends: 55 [2021-05-02 20:02:12,384 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 26.2ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-02 20:02:12,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-02 20:02:12,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-05-02 20:02:12,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 42 states have (on average 1.2142857142857142) internal successors, (51), 43 states have internal predecessors, (51), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 20:02:12,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 63 transitions. [2021-05-02 20:02:12,396 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 63 transitions. Word has length 29 [2021-05-02 20:02:12,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:02:12,396 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 63 transitions. [2021-05-02 20:02:12,396 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (4), 3 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 20:02:12,396 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 63 transitions. [2021-05-02 20:02:12,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 20:02:12,400 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:02:12,401 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:02:12,616 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:02:12,616 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:02:12,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:02:12,616 INFO L82 PathProgramCache]: Analyzing trace with hash -1031563075, now seen corresponding path program 2 times [2021-05-02 20:02:12,616 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:02:12,617 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [3513540] [2021-05-02 20:02:12,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:02:12,645 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:02:12,645 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [719007968] [2021-05-02 20:02:12,646 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:02:12,734 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 20:02:12,734 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:02:12,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 20:02:12,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:02:12,774 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:12,775 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:12,779 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:12,820 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:12,821 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:12,822 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:12,850 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:12,852 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:12,852 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:12,870 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:12,874 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:12,875 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:12,899 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:12,901 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:12,901 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:12,931 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:12,933 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:12,944 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:02:12,944 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:02:12,944 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [3513540] [2021-05-02 20:02:12,944 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:02:12,944 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [719007968] [2021-05-02 20:02:12,944 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [719007968] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:02:12,944 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:02:12,944 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 20:02:12,944 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2045239387] [2021-05-02 20:02:12,945 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 20:02:12,945 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:02:12,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 20:02:12,945 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 20:02:12,945 INFO L87 Difference]: Start difference. First operand 55 states and 63 transitions. Second operand has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 4 states have call successors, (4), 4 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 20:02:12,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:02:12,983 INFO L93 Difference]: Finished difference Result 74 states and 87 transitions. [2021-05-02 20:02:12,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 20:02:12,984 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 4 states have call successors, (4), 4 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 30 [2021-05-02 20:02:12,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:02:12,984 INFO L225 Difference]: With dead ends: 74 [2021-05-02 20:02:12,984 INFO L226 Difference]: Without dead ends: 74 [2021-05-02 20:02:12,985 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 45.0ms TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-05-02 20:02:12,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-05-02 20:02:12,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 68. [2021-05-02 20:02:12,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 53 states have (on average 1.2264150943396226) internal successors, (65), 54 states have internal predecessors, (65), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 20:02:12,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 79 transitions. [2021-05-02 20:02:12,989 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 79 transitions. Word has length 30 [2021-05-02 20:02:12,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:02:12,989 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 79 transitions. [2021-05-02 20:02:12,990 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 4 states have call successors, (4), 4 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 20:02:12,990 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 79 transitions. [2021-05-02 20:02:12,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 20:02:12,990 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:02:12,990 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:02:13,209 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:02:13,209 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:02:13,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:02:13,210 INFO L82 PathProgramCache]: Analyzing trace with hash -1030431017, now seen corresponding path program 2 times [2021-05-02 20:02:13,210 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:02:13,210 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [90592687] [2021-05-02 20:02:13,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:02:13,229 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:02:13,229 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [925227709] [2021-05-02 20:02:13,229 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:02:13,387 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 20:02:13,388 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:02:13,398 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 20:02:13,400 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:02:13,489 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:13,492 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:13,512 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:13,525 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:13,575 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:13,577 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:13,598 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:02:13,598 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:02:13,598 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [90592687] [2021-05-02 20:02:13,598 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:02:13,598 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [925227709] [2021-05-02 20:02:13,598 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [925227709] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:02:13,598 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:02:13,598 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 20:02:13,598 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120469725] [2021-05-02 20:02:13,599 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 20:02:13,600 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:02:13,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 20:02:13,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-05-02 20:02:13,600 INFO L87 Difference]: Start difference. First operand 68 states and 79 transitions. Second operand has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 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 20:02:13,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:02:13,817 INFO L93 Difference]: Finished difference Result 93 states and 109 transitions. [2021-05-02 20:02:13,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 20:02:13,817 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 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 30 [2021-05-02 20:02:13,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:02:13,819 INFO L225 Difference]: With dead ends: 93 [2021-05-02 20:02:13,819 INFO L226 Difference]: Without dead ends: 92 [2021-05-02 20:02:13,819 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 138.2ms TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 20:02:13,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-05-02 20:02:13,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 88. [2021-05-02 20:02:13,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 68 states have (on average 1.1911764705882353) internal successors, (81), 70 states have internal predecessors, (81), 11 states have call successors, (11), 9 states have call predecessors, (11), 8 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 20:02:13,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 101 transitions. [2021-05-02 20:02:13,849 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 101 transitions. Word has length 30 [2021-05-02 20:02:13,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:02:13,849 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 101 transitions. [2021-05-02 20:02:13,849 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 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 20:02:13,849 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 101 transitions. [2021-05-02 20:02:13,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 20:02:13,852 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:02:13,852 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:02:14,068 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 20:02:14,068 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:02:14,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:02:14,069 INFO L82 PathProgramCache]: Analyzing trace with hash 1111952806, now seen corresponding path program 3 times [2021-05-02 20:02:14,069 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:02:14,069 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [839382826] [2021-05-02 20:02:14,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:02:14,074 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:02:14,074 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [293474511] [2021-05-02 20:02:14,075 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:02:15,150 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 20:02:15,151 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:02:15,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 20:02:15,154 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:02:15,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:15,303 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:15,350 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:15,354 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:15,445 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 11 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 20:02:15,445 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:02:15,445 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [839382826] [2021-05-02 20:02:15,445 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:02:15,446 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [293474511] [2021-05-02 20:02:15,446 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [293474511] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:02:15,446 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:02:15,446 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 20:02:15,446 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1693590296] [2021-05-02 20:02:15,446 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 20:02:15,446 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:02:15,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 20:02:15,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:02:15,447 INFO L87 Difference]: Start difference. First operand 88 states and 101 transitions. Second operand has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:02:15,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:02:15,500 INFO L93 Difference]: Finished difference Result 71 states and 78 transitions. [2021-05-02 20:02:15,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 20:02:15,501 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 36 [2021-05-02 20:02:15,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:02:15,504 INFO L225 Difference]: With dead ends: 71 [2021-05-02 20:02:15,504 INFO L226 Difference]: Without dead ends: 54 [2021-05-02 20:02:15,504 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 56.5ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:02:15,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-02 20:02:15,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 46. [2021-05-02 20:02:15,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 35 states have (on average 1.2) internal successors, (42), 36 states have internal predecessors, (42), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 20:02:15,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 52 transitions. [2021-05-02 20:02:15,509 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 52 transitions. Word has length 36 [2021-05-02 20:02:15,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:02:15,509 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 52 transitions. [2021-05-02 20:02:15,510 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:02:15,510 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 52 transitions. [2021-05-02 20:02:15,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 20:02:15,511 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:02:15,511 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:02:15,716 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 20:02:15,716 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:02:15,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:02:15,716 INFO L82 PathProgramCache]: Analyzing trace with hash 954968015, now seen corresponding path program 3 times [2021-05-02 20:02:15,717 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:02:15,717 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1575844870] [2021-05-02 20:02:15,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:02:15,722 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:02:15,722 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1690580596] [2021-05-02 20:02:15,722 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 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:02:16,199 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 20:02:16,200 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:02:16,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 20:02:16,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:02:16,212 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:16,214 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:16,214 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:16,219 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:16,221 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:16,221 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:16,238 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:16,240 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:16,240 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:16,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:16,261 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:16,261 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:16,285 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:16,287 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:16,287 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:16,303 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:16,306 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:16,307 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:16,340 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:16,341 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:16,359 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 4 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:02:16,359 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:02:16,359 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1575844870] [2021-05-02 20:02:16,359 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:02:16,359 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1690580596] [2021-05-02 20:02:16,359 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1690580596] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:02:16,359 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:02:16,359 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 20:02:16,359 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1745553709] [2021-05-02 20:02:16,360 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 20:02:16,360 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:02:16,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 20:02:16,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 20:02:16,360 INFO L87 Difference]: Start difference. First operand 46 states and 52 transitions. Second operand has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 8 states have internal predecessors, (31), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:02:16,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:02:16,433 INFO L93 Difference]: Finished difference Result 87 states and 101 transitions. [2021-05-02 20:02:16,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 20:02:16,433 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 8 states have internal predecessors, (31), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 39 [2021-05-02 20:02:16,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:02:16,434 INFO L225 Difference]: With dead ends: 87 [2021-05-02 20:02:16,434 INFO L226 Difference]: Without dead ends: 87 [2021-05-02 20:02:16,435 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 46.6ms TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-05-02 20:02:16,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-02 20:02:16,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 67. [2021-05-02 20:02:16,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 52 states have (on average 1.1923076923076923) internal successors, (62), 53 states have internal predecessors, (62), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 20:02:16,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 76 transitions. [2021-05-02 20:02:16,454 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 76 transitions. Word has length 39 [2021-05-02 20:02:16,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:02:16,456 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 76 transitions. [2021-05-02 20:02:16,456 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 8 states have internal predecessors, (31), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:02:16,456 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 76 transitions. [2021-05-02 20:02:16,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 20:02:16,457 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:02:16,457 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:02:16,661 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 20:02:16,661 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:02:16,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:02:16,662 INFO L82 PathProgramCache]: Analyzing trace with hash 956100073, now seen corresponding path program 4 times [2021-05-02 20:02:16,662 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:02:16,662 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [962828796] [2021-05-02 20:02:16,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:02:16,668 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:02:16,668 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1438745197] [2021-05-02 20:02:16,668 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:02:16,941 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 20:02:16,942 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:02:16,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 44 conjunts are in the unsatisfiable core [2021-05-02 20:02:16,948 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:02:17,073 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:17,088 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:17,247 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:17,249 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:17,388 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:17,391 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:17,440 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 3 proven. 24 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 20:02:17,440 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:02:17,440 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [962828796] [2021-05-02 20:02:17,440 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:02:17,440 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1438745197] [2021-05-02 20:02:17,440 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1438745197] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:02:17,440 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:02:17,440 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-05-02 20:02:17,440 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [310162628] [2021-05-02 20:02:17,441 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 20:02:17,441 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:02:17,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 20:02:17,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2021-05-02 20:02:17,442 INFO L87 Difference]: Start difference. First operand 67 states and 76 transitions. Second operand has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 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 20:02:17,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:02:17,771 INFO L93 Difference]: Finished difference Result 79 states and 90 transitions. [2021-05-02 20:02:17,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 20:02:17,772 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 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 39 [2021-05-02 20:02:17,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:02:17,772 INFO L225 Difference]: With dead ends: 79 [2021-05-02 20:02:17,772 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 20:02:17,773 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 268.3ms TimeCoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2021-05-02 20:02:17,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 20:02:17,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 65. [2021-05-02 20:02:17,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 50 states have (on average 1.18) internal successors, (59), 51 states have internal predecessors, (59), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 20:02:17,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 73 transitions. [2021-05-02 20:02:17,775 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 73 transitions. Word has length 39 [2021-05-02 20:02:17,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:02:17,775 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 73 transitions. [2021-05-02 20:02:17,775 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 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 20:02:17,775 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 73 transitions. [2021-05-02 20:02:17,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 20:02:17,775 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:02:17,775 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:02:17,985 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:02:17,985 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:02:17,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:02:17,985 INFO L82 PathProgramCache]: Analyzing trace with hash -1223907629, now seen corresponding path program 2 times [2021-05-02 20:02:17,985 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:02:17,985 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [616161573] [2021-05-02 20:02:17,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:02:17,991 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:02:17,991 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [669530495] [2021-05-02 20:02:17,991 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:02:18,114 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 20:02:18,114 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:02:18,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 20:02:18,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:02:18,123 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,124 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,125 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,128 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,129 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,129 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,136 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,138 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,138 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,145 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,147 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,147 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,155 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,156 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,182 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-05-02 20:02:18,182 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:02:18,182 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [616161573] [2021-05-02 20:02:18,182 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:02:18,182 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [669530495] [2021-05-02 20:02:18,183 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [669530495] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:02:18,183 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:02:18,183 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 20:02:18,183 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996803739] [2021-05-02 20:02:18,183 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 20:02:18,183 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:02:18,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 20:02:18,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 20:02:18,184 INFO L87 Difference]: Start difference. First operand 65 states and 73 transitions. Second operand has 7 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 3 states have call successors, (4), 3 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 20:02:18,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:02:18,254 INFO L93 Difference]: Finished difference Result 67 states and 75 transitions. [2021-05-02 20:02:18,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 20:02:18,255 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 3 states have call successors, (4), 3 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 41 [2021-05-02 20:02:18,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:02:18,255 INFO L225 Difference]: With dead ends: 67 [2021-05-02 20:02:18,255 INFO L226 Difference]: Without dead ends: 67 [2021-05-02 20:02:18,255 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 36.4ms TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-05-02 20:02:18,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-05-02 20:02:18,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2021-05-02 20:02:18,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 52 states have (on average 1.1730769230769231) internal successors, (61), 53 states have internal predecessors, (61), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 20:02:18,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 75 transitions. [2021-05-02 20:02:18,257 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 75 transitions. Word has length 41 [2021-05-02 20:02:18,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:02:18,257 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 75 transitions. [2021-05-02 20:02:18,257 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 3 states have call successors, (4), 3 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 20:02:18,257 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 75 transitions. [2021-05-02 20:02:18,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 20:02:18,258 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:02:18,258 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:02:18,473 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 20:02:18,473 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:02:18,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:02:18,473 INFO L82 PathProgramCache]: Analyzing trace with hash 805846188, now seen corresponding path program 4 times [2021-05-02 20:02:18,473 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:02:18,473 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1861423673] [2021-05-02 20:02:18,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:02:18,481 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:02:18,482 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [776857868] [2021-05-02 20:02:18,482 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:02:18,568 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 20:02:18,569 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:02:18,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 20:02:18,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:02:18,589 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,590 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,591 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,594 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,602 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,602 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,611 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,622 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,623 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,633 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,633 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,656 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,657 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,657 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,671 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,689 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,690 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,707 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,709 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,709 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,744 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,745 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:18,761 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 4 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:02:18,762 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:02:18,762 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1861423673] [2021-05-02 20:02:18,762 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:02:18,762 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [776857868] [2021-05-02 20:02:18,762 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [776857868] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:02:18,762 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:02:18,762 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 20:02:18,762 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1562053942] [2021-05-02 20:02:18,764 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 20:02:18,764 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:02:18,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 20:02:18,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 20:02:18,765 INFO L87 Difference]: Start difference. First operand 67 states and 75 transitions. Second operand has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:02:18,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:02:18,849 INFO L93 Difference]: Finished difference Result 108 states and 124 transitions. [2021-05-02 20:02:18,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 20:02:18,850 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 42 [2021-05-02 20:02:18,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:02:18,853 INFO L225 Difference]: With dead ends: 108 [2021-05-02 20:02:18,853 INFO L226 Difference]: Without dead ends: 108 [2021-05-02 20:02:18,853 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 91.9ms TimeCoverageRelationStatistics Valid=56, Invalid=100, Unknown=0, NotChecked=0, Total=156 [2021-05-02 20:02:18,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-05-02 20:02:18,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 88. [2021-05-02 20:02:18,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 69 states have (on average 1.173913043478261) internal successors, (81), 70 states have internal predecessors, (81), 10 states have call successors, (10), 9 states have call predecessors, (10), 8 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 20:02:18,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 99 transitions. [2021-05-02 20:02:18,856 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 99 transitions. Word has length 42 [2021-05-02 20:02:18,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:02:18,857 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 99 transitions. [2021-05-02 20:02:18,857 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:02:18,858 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 99 transitions. [2021-05-02 20:02:18,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 20:02:18,858 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:02:18,858 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:02:19,068 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 20:02:19,069 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:02:19,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:02:19,069 INFO L82 PathProgramCache]: Analyzing trace with hash 806978246, now seen corresponding path program 5 times [2021-05-02 20:02:19,069 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:02:19,069 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [16706418] [2021-05-02 20:02:19,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:02:19,083 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:02:19,083 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [797859472] [2021-05-02 20:02:19,083 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:02:19,593 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-02 20:02:19,593 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:02:19,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 20:02:19,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:02:19,694 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:19,696 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:19,766 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:19,768 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:19,842 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:19,843 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:19,886 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 3 proven. 33 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 20:02:19,886 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:02:19,886 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [16706418] [2021-05-02 20:02:19,886 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:02:19,886 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [797859472] [2021-05-02 20:02:19,886 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [797859472] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:02:19,886 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:02:19,886 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-05-02 20:02:19,887 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [151531763] [2021-05-02 20:02:19,888 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 20:02:19,888 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:02:19,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 20:02:19,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-05-02 20:02:19,889 INFO L87 Difference]: Start difference. First operand 88 states and 99 transitions. Second operand has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 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 20:02:20,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:02:20,263 INFO L93 Difference]: Finished difference Result 129 states and 148 transitions. [2021-05-02 20:02:20,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 20:02:20,264 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 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 42 [2021-05-02 20:02:20,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:02:20,265 INFO L225 Difference]: With dead ends: 129 [2021-05-02 20:02:20,265 INFO L226 Difference]: Without dead ends: 127 [2021-05-02 20:02:20,265 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 204.8ms TimeCoverageRelationStatistics Valid=41, Invalid=231, Unknown=0, NotChecked=0, Total=272 [2021-05-02 20:02:20,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-05-02 20:02:20,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 97. [2021-05-02 20:02:20,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 76 states have (on average 1.1710526315789473) internal successors, (89), 77 states have internal predecessors, (89), 11 states have call successors, (11), 10 states have call predecessors, (11), 9 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 20:02:20,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 109 transitions. [2021-05-02 20:02:20,287 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 109 transitions. Word has length 42 [2021-05-02 20:02:20,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:02:20,287 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 109 transitions. [2021-05-02 20:02:20,287 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 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 20:02:20,287 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 109 transitions. [2021-05-02 20:02:20,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 20:02:20,287 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:02:20,287 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:02:20,492 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:02:20,492 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:02:20,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:02:20,493 INFO L82 PathProgramCache]: Analyzing trace with hash 1498904688, now seen corresponding path program 3 times [2021-05-02 20:02:20,493 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:02:20,493 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1037394121] [2021-05-02 20:02:20,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:02:20,499 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:02:20,499 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1195773437] [2021-05-02 20:02:20,499 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 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:02:22,587 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 20:02:22,588 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:02:22,591 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 20:02:22,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:02:22,641 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:22,642 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:22,652 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:22,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:22,706 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-05-02 20:02:22,706 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:02:22,706 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1037394121] [2021-05-02 20:02:22,706 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:02:22,706 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1195773437] [2021-05-02 20:02:22,706 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1195773437] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:02:22,706 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:02:22,706 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 20:02:22,706 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1980161303] [2021-05-02 20:02:22,707 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 20:02:22,707 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:02:22,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 20:02:22,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 20:02:22,707 INFO L87 Difference]: Start difference. First operand 97 states and 109 transitions. Second operand has 5 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 2 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 20:02:22,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:02:22,722 INFO L93 Difference]: Finished difference Result 99 states and 110 transitions. [2021-05-02 20:02:22,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 20:02:22,723 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 2 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 44 [2021-05-02 20:02:22,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:02:22,723 INFO L225 Difference]: With dead ends: 99 [2021-05-02 20:02:22,723 INFO L226 Difference]: Without dead ends: 97 [2021-05-02 20:02:22,724 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 11.9ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:02:22,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-05-02 20:02:22,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2021-05-02 20:02:22,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 76 states have (on average 1.1578947368421053) internal successors, (88), 77 states have internal predecessors, (88), 11 states have call successors, (11), 10 states have call predecessors, (11), 9 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 20:02:22,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 108 transitions. [2021-05-02 20:02:22,726 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 108 transitions. Word has length 44 [2021-05-02 20:02:22,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:02:22,726 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 108 transitions. [2021-05-02 20:02:22,726 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 2 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 20:02:22,726 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 108 transitions. [2021-05-02 20:02:22,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 20:02:22,726 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:02:22,726 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:02:22,932 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:02:22,932 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:02:22,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:02:22,932 INFO L82 PathProgramCache]: Analyzing trace with hash -686317905, now seen corresponding path program 5 times [2021-05-02 20:02:22,933 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:02:22,933 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [736771396] [2021-05-02 20:02:22,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:02:22,938 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:02:22,938 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2079925326] [2021-05-02 20:02:22,938 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:02:23,099 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-05-02 20:02:23,099 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:02:23,100 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 20:02:23,101 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:02:23,110 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:23,112 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:23,113 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:23,116 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:23,117 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:23,118 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:23,124 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:23,126 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:23,126 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:23,134 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:23,135 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:23,135 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:23,143 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:23,144 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:23,145 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:23,153 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:23,155 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:23,155 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:23,165 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:23,166 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:23,167 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:23,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:23,187 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:23,188 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:23,205 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:23,206 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:02:23,216 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 4 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:02:23,217 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:02:23,217 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [736771396] [2021-05-02 20:02:23,217 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:02:23,217 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2079925326] [2021-05-02 20:02:23,217 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2079925326] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:02:23,217 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:02:23,217 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 20:02:23,217 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1020479590] [2021-05-02 20:02:23,217 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 20:02:23,217 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:02:23,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 20:02:23,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-02 20:02:23,218 INFO L87 Difference]: Start difference. First operand 97 states and 108 transitions. Second operand has 11 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 10 states have internal predecessors, (37), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:02:23,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:02:23,301 INFO L93 Difference]: Finished difference Result 149 states and 167 transitions. [2021-05-02 20:02:23,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 20:02:23,301 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 10 states have internal predecessors, (37), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 45 [2021-05-02 20:02:23,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:02:23,302 INFO L225 Difference]: With dead ends: 149 [2021-05-02 20:02:23,302 INFO L226 Difference]: Without dead ends: 149 [2021-05-02 20:02:23,302 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 61.9ms TimeCoverageRelationStatistics Valid=75, Invalid=135, Unknown=0, NotChecked=0, Total=210 [2021-05-02 20:02:23,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-05-02 20:02:23,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 127. [2021-05-02 20:02:23,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 99 states have (on average 1.1717171717171717) internal successors, (116), 101 states have internal predecessors, (116), 15 states have call successors, (15), 13 states have call predecessors, (15), 12 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-02 20:02:23,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 143 transitions. [2021-05-02 20:02:23,310 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 143 transitions. Word has length 45 [2021-05-02 20:02:23,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:02:23,310 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 143 transitions. [2021-05-02 20:02:23,310 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 10 states have internal predecessors, (37), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:02:23,311 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 143 transitions. [2021-05-02 20:02:23,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 20:02:23,311 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:02:23,311 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:02:23,514 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:02:23,515 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:02:23,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:02:23,515 INFO L82 PathProgramCache]: Analyzing trace with hash -685185847, now seen corresponding path program 6 times [2021-05-02 20:02:23,515 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:02:23,515 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [59721155] [2021-05-02 20:02:23,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:02:23,521 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:02:23,521 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1985124709] [2021-05-02 20:02:23,521 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true