/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/hard2_unwindbound10.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 21:01:55,823 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 21:01:55,825 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 21:01:55,843 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 21:01:55,843 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 21:01:55,844 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 21:01:55,845 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 21:01:55,846 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 21:01:55,847 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 21:01:55,848 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 21:01:55,848 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 21:01:55,849 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 21:01:55,849 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 21:01:55,850 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 21:01:55,850 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 21:01:55,851 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 21:01:55,852 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 21:01:55,852 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 21:01:55,853 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 21:01:55,854 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 21:01:55,855 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 21:01:55,858 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 21:01:55,858 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 21:01:55,859 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 21:01:55,860 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 21:01:55,865 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 21:01:55,866 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 21:01:55,866 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 21:01:55,867 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 21:01:55,874 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 21:01:55,874 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 21:01:55,875 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 21:01:55,875 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 21:01:55,875 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 21:01:55,875 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 21:01:55,876 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 21:01:55,876 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 21:01:55,876 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 21:01:55,876 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 21:01:55,876 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 21:01:55,876 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 21:01:55,876 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 21:01:55,876 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 21:01:55,877 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 21:01:55,877 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 21:01:55,877 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 21:01:55,877 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 21:01:55,877 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 21:01:55,877 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 21:01:55,877 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 21:01:55,878 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 21:01:55,878 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 21:01:56,106 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 21:01:56,129 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 21:01:56,131 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 21:01:56,132 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 21:01:56,134 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 21:01:56,134 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/hard2_unwindbound10.c [2021-05-02 21:01:56,177 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a18a25d49/5c0452e1b616437b9ee9d4af8b958079/FLAGe2cc69e13 [2021-05-02 21:01:56,573 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 21:01:56,573 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard2_unwindbound10.c [2021-05-02 21:01:56,578 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a18a25d49/5c0452e1b616437b9ee9d4af8b958079/FLAGe2cc69e13 [2021-05-02 21:01:56,591 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a18a25d49/5c0452e1b616437b9ee9d4af8b958079 [2021-05-02 21:01:56,593 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 21:01:56,595 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 21:01:56,598 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 21:01:56,598 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 21:01:56,601 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 21:01:56,602 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 09:01:56" (1/1) ... [2021-05-02 21:01:56,602 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@38ae79bb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 09:01:56, skipping insertion in model container [2021-05-02 21:01:56,603 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 09:01:56" (1/1) ... [2021-05-02 21:01:56,607 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 21:01:56,623 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 21:01:56,737 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/hard2_unwindbound10.c[526,539] [2021-05-02 21:01:56,755 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 21:01:56,762 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 21:01:56,773 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/hard2_unwindbound10.c[526,539] [2021-05-02 21:01:56,786 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 21:01:56,796 INFO L208 MainTranslator]: Completed translation [2021-05-02 21:01:56,797 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 09:01:56 WrapperNode [2021-05-02 21:01:56,797 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 21:01:56,799 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 21:01:56,799 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 21:01:56,799 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 21:01:56,815 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 09:01:56" (1/1) ... [2021-05-02 21:01:56,815 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 09:01:56" (1/1) ... [2021-05-02 21:01:56,820 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 09:01:56" (1/1) ... [2021-05-02 21:01:56,821 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 09:01:56" (1/1) ... [2021-05-02 21:01:56,831 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 09:01:56" (1/1) ... [2021-05-02 21:01:56,840 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 09:01:56" (1/1) ... [2021-05-02 21:01:56,844 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 09:01:56" (1/1) ... [2021-05-02 21:01:56,848 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 21:01:56,849 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 21:01:56,849 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 21:01:56,849 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 21:01:56,850 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 09:01:56" (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 21:01:56,902 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 21:01:56,902 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 21:01:56,902 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 21:01:56,902 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 21:01:56,902 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 21:01:56,903 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 21:01:56,903 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 21:01:56,903 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 21:01:56,903 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 21:01:56,903 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 21:01:56,903 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 21:01:56,904 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 21:01:56,904 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 21:01:56,904 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 21:01:56,904 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 21:01:56,904 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 21:01:56,904 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 21:01:56,905 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 21:01:56,905 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 21:01:56,905 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 21:01:57,068 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 21:01:57,068 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 21:01:57,069 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 09:01:57 BoogieIcfgContainer [2021-05-02 21:01:57,069 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 21:01:57,070 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 21:01:57,070 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 21:01:57,070 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 21:01:57,072 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 09:01:57" (1/1) ... [2021-05-02 21:01:57,105 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 09:01:57 BasicIcfg [2021-05-02 21:01:57,105 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 21:01:57,106 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 21:01:57,106 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 21:01:57,108 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 21:01:57,108 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 09:01:56" (1/4) ... [2021-05-02 21:01:57,109 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@557a2cdf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 09:01:57, skipping insertion in model container [2021-05-02 21:01:57,109 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 09:01:56" (2/4) ... [2021-05-02 21:01:57,109 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@557a2cdf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 09:01:57, skipping insertion in model container [2021-05-02 21:01:57,109 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 09:01:57" (3/4) ... [2021-05-02 21:01:57,109 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@557a2cdf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 09:01:57, skipping insertion in model container [2021-05-02 21:01:57,109 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 09:01:57" (4/4) ... [2021-05-02 21:01:57,110 INFO L111 eAbstractionObserver]: Analyzing ICFG hard2_unwindbound10.cJordan [2021-05-02 21:01:57,126 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 21:01:57,129 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 21:01:57,140 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 21:01:57,186 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 21:01:57,187 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 21:01:57,187 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 21:01:57,187 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 21:01:57,187 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 21:01:57,187 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 21:01:57,187 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 21:01:57,187 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 21:01:57,198 INFO L276 IsEmpty]: Start isEmpty. Operand has 31 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 18 states have internal predecessors, (26), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 21:01:57,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 21:01:57,202 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 21:01:57,203 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 21:01:57,203 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 21:01:57,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 21:01:57,206 INFO L82 PathProgramCache]: Analyzing trace with hash 121155216, now seen corresponding path program 1 times [2021-05-02 21:01:57,212 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 21:01:57,212 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1406898307] [2021-05-02 21:01:57,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 21:01:57,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 21:01:57,374 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 21:01:57,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 21:01:57,385 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 21:01:57,386 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 21:01:57,386 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1406898307] [2021-05-02 21:01:57,386 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1406898307] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 21:01:57,386 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 21:01:57,387 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 21:01:57,387 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1023661326] [2021-05-02 21:01:57,390 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 21:01:57,390 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 21:01:57,398 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 21:01:57,398 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 21:01:57,399 INFO L87 Difference]: Start difference. First operand has 31 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 18 states have internal predecessors, (26), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 3 states, 3 states have (on average 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 21:01:57,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 21:01:57,498 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2021-05-02 21:01:57,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 21:01:57,499 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 21:01:57,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 21:01:57,506 INFO L225 Difference]: With dead ends: 32 [2021-05-02 21:01:57,507 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 21:01:57,508 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 43.2ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 21:01:57,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 21:01:57,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2021-05-02 21:01:57,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 9 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 21:01:57,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 36 transitions. [2021-05-02 21:01:57,531 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 36 transitions. Word has length 12 [2021-05-02 21:01:57,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 21:01:57,531 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 36 transitions. [2021-05-02 21:01:57,531 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 21:01:57,531 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 36 transitions. [2021-05-02 21:01:57,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 21:01:57,532 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 21:01:57,532 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 21:01:57,532 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 21:01:57,532 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 21:01:57,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 21:01:57,533 INFO L82 PathProgramCache]: Analyzing trace with hash 152644303, now seen corresponding path program 1 times [2021-05-02 21:01:57,533 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 21:01:57,533 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [179427858] [2021-05-02 21:01:57,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 21:01:57,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 21:01:57,629 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 21:01:57,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 21:01:57,637 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 21:01:57,637 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 21:01:57,637 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [179427858] [2021-05-02 21:01:57,638 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [179427858] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 21:01:57,638 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 21:01:57,638 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 21:01:57,638 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2075264257] [2021-05-02 21:01:57,639 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 21:01:57,639 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 21:01:57,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 21:01:57,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 21:01:57,640 INFO L87 Difference]: Start difference. First operand 26 states and 36 transitions. Second operand has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 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 21:01:57,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 21:01:57,862 INFO L93 Difference]: Finished difference Result 39 states and 54 transitions. [2021-05-02 21:01:57,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 21:01:57,863 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 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 21:01:57,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 21:01:57,864 INFO L225 Difference]: With dead ends: 39 [2021-05-02 21:01:57,864 INFO L226 Difference]: Without dead ends: 39 [2021-05-02 21:01:57,865 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 135.4ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 21:01:57,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-02 21:01:57,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 30. [2021-05-02 21:01:57,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 9 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 21:01:57,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 39 transitions. [2021-05-02 21:01:57,870 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 39 transitions. Word has length 12 [2021-05-02 21:01:57,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 21:01:57,870 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 39 transitions. [2021-05-02 21:01:57,871 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 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 21:01:57,871 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 39 transitions. [2021-05-02 21:01:57,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 21:01:57,871 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 21:01:57,871 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 21:01:57,871 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 21:01:57,871 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 21:01:57,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 21:01:57,872 INFO L82 PathProgramCache]: Analyzing trace with hash -400958603, now seen corresponding path program 1 times [2021-05-02 21:01:57,872 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 21:01:57,872 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [160580677] [2021-05-02 21:01:57,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 21:01:57,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 21:01:57,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 21:01:57,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 21:01:57,937 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 21:01:57,937 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 21:01:57,937 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [160580677] [2021-05-02 21:01:57,937 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [160580677] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 21:01:57,938 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 21:01:57,938 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 21:01:57,938 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1112743068] [2021-05-02 21:01:57,938 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 21:01:57,938 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 21:01:57,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 21:01:57,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 21:01:57,939 INFO L87 Difference]: Start difference. First operand 30 states and 39 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 21:01:58,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 21:01:58,016 INFO L93 Difference]: Finished difference Result 32 states and 41 transitions. [2021-05-02 21:01:58,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 21:01:58,017 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 21:01:58,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 21:01:58,019 INFO L225 Difference]: With dead ends: 32 [2021-05-02 21:01:58,019 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 21:01:58,019 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 38.3ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 21:01:58,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 21:01:58,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 21:01:58,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 20 states have internal predecessors, (25), 9 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 21:01:58,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 41 transitions. [2021-05-02 21:01:58,029 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 41 transitions. Word has length 14 [2021-05-02 21:01:58,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 21:01:58,029 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 41 transitions. [2021-05-02 21:01:58,030 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 21:01:58,030 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 41 transitions. [2021-05-02 21:01:58,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 21:01:58,030 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 21:01:58,030 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 21:01:58,030 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 21:01:58,031 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 21:01:58,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 21:01:58,037 INFO L82 PathProgramCache]: Analyzing trace with hash 185978583, now seen corresponding path program 1 times [2021-05-02 21:01:58,037 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 21:01:58,037 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [853691478] [2021-05-02 21:01:58,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 21:01:58,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 21:01:58,096 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 21:01:58,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 21:01:58,102 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-05-02 21:01:58,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 21:01:58,110 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 21:01:58,110 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 21:01:58,110 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [853691478] [2021-05-02 21:01:58,110 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [853691478] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 21:01:58,110 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 21:01:58,110 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 21:01:58,111 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206833531] [2021-05-02 21:01:58,111 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 21:01:58,111 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 21:01:58,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 21:01:58,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 21:01:58,112 INFO L87 Difference]: Start difference. First operand 32 states and 41 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 21:01:58,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 21:01:58,316 INFO L93 Difference]: Finished difference Result 44 states and 58 transitions. [2021-05-02 21:01:58,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 21:01:58,317 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 17 [2021-05-02 21:01:58,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 21:01:58,317 INFO L225 Difference]: With dead ends: 44 [2021-05-02 21:01:58,317 INFO L226 Difference]: Without dead ends: 44 [2021-05-02 21:01:58,318 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 119.7ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 21:01:58,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-02 21:01:58,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 36. [2021-05-02 21:01:58,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 23 states have internal predecessors, (28), 9 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 21:01:58,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 44 transitions. [2021-05-02 21:01:58,321 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 44 transitions. Word has length 17 [2021-05-02 21:01:58,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 21:01:58,321 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 44 transitions. [2021-05-02 21:01:58,321 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 21:01:58,321 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 44 transitions. [2021-05-02 21:01:58,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 21:01:58,322 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 21:01:58,322 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 21:01:58,322 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 21:01:58,322 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 21:01:58,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 21:01:58,322 INFO L82 PathProgramCache]: Analyzing trace with hash -820589269, now seen corresponding path program 1 times [2021-05-02 21:01:58,323 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 21:01:58,323 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [103843609] [2021-05-02 21:01:58,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 21:01:58,336 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 21:01:58,337 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [568877632] [2021-05-02 21:01:58,337 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 21:01:58,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 21:01:58,408 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 21:01:58,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 21:01:58,571 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 21:01:58,572 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 21:01:58,572 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [103843609] [2021-05-02 21:01:58,572 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 21:01:58,572 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [568877632] [2021-05-02 21:01:58,572 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [568877632] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 21:01:58,572 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 21:01:58,572 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 21:01:58,572 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845266908] [2021-05-02 21:01:58,573 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 21:01:58,573 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 21:01:58,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 21:01:58,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-02 21:01:58,573 INFO L87 Difference]: Start difference. First operand 36 states and 44 transitions. Second operand has 8 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 21:01:58,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 21:01:58,677 INFO L93 Difference]: Finished difference Result 55 states and 69 transitions. [2021-05-02 21:01:58,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 21:01:58,678 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 22 [2021-05-02 21:01:58,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 21:01:58,680 INFO L225 Difference]: With dead ends: 55 [2021-05-02 21:01:58,680 INFO L226 Difference]: Without dead ends: 54 [2021-05-02 21:01:58,681 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 66.8ms TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-05-02 21:01:58,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-02 21:01:58,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-05-02 21:01:58,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 32 states have (on average 1.25) internal successors, (40), 34 states have internal predecessors, (40), 15 states have call successors, (15), 7 states have call predecessors, (15), 6 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-02 21:01:58,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 67 transitions. [2021-05-02 21:01:58,692 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 67 transitions. Word has length 22 [2021-05-02 21:01:58,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 21:01:58,693 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 67 transitions. [2021-05-02 21:01:58,693 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 21:01:58,694 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 67 transitions. [2021-05-02 21:01:58,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 21:01:58,695 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 21:01:58,696 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 21:01:58,908 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 21:01:58,909 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 21:01:58,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 21:01:58,910 INFO L82 PathProgramCache]: Analyzing trace with hash 1259710898, now seen corresponding path program 1 times [2021-05-02 21:01:58,910 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 21:01:58,910 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1909944634] [2021-05-02 21:01:58,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 21:01:58,916 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 21:01:58,916 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1439963254] [2021-05-02 21:01:58,916 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 21:01:58,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 21:01:58,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 21:01:58,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 21:01:58,995 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:01:59,005 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:01:59,008 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:01:59,034 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:01:59,037 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:01:59,041 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:01:59,098 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:01:59,102 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:01:59,113 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 21:01:59,113 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 21:01:59,113 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1909944634] [2021-05-02 21:01:59,113 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 21:01:59,113 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1439963254] [2021-05-02 21:01:59,113 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1439963254] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 21:01:59,113 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 21:01:59,113 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 21:01:59,113 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522289464] [2021-05-02 21:01:59,114 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 21:01:59,114 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 21:01:59,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 21:01:59,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 21:01:59,115 INFO L87 Difference]: Start difference. First operand 54 states and 67 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 21:01:59,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 21:01:59,141 INFO L93 Difference]: Finished difference Result 63 states and 73 transitions. [2021-05-02 21:01:59,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 21:01:59,141 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 30 [2021-05-02 21:01:59,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 21:01:59,144 INFO L225 Difference]: With dead ends: 63 [2021-05-02 21:01:59,144 INFO L226 Difference]: Without dead ends: 63 [2021-05-02 21:01:59,144 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 7.0ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 21:01:59,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-02 21:01:59,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2021-05-02 21:01:59,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 38 states have (on average 1.1842105263157894) internal successors, (45), 40 states have internal predecessors, (45), 15 states have call successors, (15), 9 states have call predecessors, (15), 8 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-02 21:01:59,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 72 transitions. [2021-05-02 21:01:59,156 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 72 transitions. Word has length 30 [2021-05-02 21:01:59,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 21:01:59,157 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 72 transitions. [2021-05-02 21:01:59,157 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 21:01:59,157 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 72 transitions. [2021-05-02 21:01:59,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 21:01:59,157 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 21:01:59,157 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 21:01:59,372 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 21:01:59,375 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 21:01:59,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 21:01:59,375 INFO L82 PathProgramCache]: Analyzing trace with hash 1260813165, now seen corresponding path program 1 times [2021-05-02 21:01:59,375 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 21:01:59,376 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [678270430] [2021-05-02 21:01:59,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 21:01:59,382 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 21:01:59,382 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1575788469] [2021-05-02 21:01:59,382 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 21:01:59,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 21:01:59,421 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 21:01:59,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 21:01:59,484 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 21:01:59,484 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 21:01:59,484 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [678270430] [2021-05-02 21:01:59,484 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 21:01:59,485 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1575788469] [2021-05-02 21:01:59,485 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1575788469] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 21:01:59,485 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 21:01:59,485 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 21:01:59,485 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049482898] [2021-05-02 21:01:59,485 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 21:01:59,485 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 21:01:59,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 21:01:59,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-05-02 21:01:59,486 INFO L87 Difference]: Start difference. First operand 62 states and 72 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 21:01:59,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 21:01:59,564 INFO L93 Difference]: Finished difference Result 74 states and 89 transitions. [2021-05-02 21:01:59,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 21:01:59,564 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 30 [2021-05-02 21:01:59,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 21:01:59,565 INFO L225 Difference]: With dead ends: 74 [2021-05-02 21:01:59,565 INFO L226 Difference]: Without dead ends: 64 [2021-05-02 21:01:59,566 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 38.9ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-02 21:01:59,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-02 21:01:59,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2021-05-02 21:01:59,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 41 states have internal predecessors, (48), 15 states have call successors, (15), 9 states have call predecessors, (15), 8 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-02 21:01:59,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 76 transitions. [2021-05-02 21:01:59,577 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 76 transitions. Word has length 30 [2021-05-02 21:01:59,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 21:01:59,577 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 76 transitions. [2021-05-02 21:01:59,577 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 21:01:59,577 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 76 transitions. [2021-05-02 21:01:59,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 21:01:59,582 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 21:01:59,583 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 21:01:59,796 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 21:01:59,797 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 21:01:59,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 21:01:59,797 INFO L82 PathProgramCache]: Analyzing trace with hash 1811137592, now seen corresponding path program 1 times [2021-05-02 21:01:59,797 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 21:01:59,797 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [324593964] [2021-05-02 21:01:59,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 21:01:59,803 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 21:01:59,803 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [322588289] [2021-05-02 21:01:59,803 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 21:01:59,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 21:01:59,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 21:01:59,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 21:01:59,868 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:01:59,871 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:01:59,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:01:59,879 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:01:59,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:01:59,883 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:01:59,911 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:01:59,913 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:01:59,929 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 18 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-05-02 21:01:59,929 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 21:01:59,929 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [324593964] [2021-05-02 21:01:59,930 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 21:01:59,930 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [322588289] [2021-05-02 21:01:59,930 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [322588289] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 21:01:59,930 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 21:01:59,930 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-02 21:01:59,930 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154579945] [2021-05-02 21:01:59,931 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 21:01:59,932 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 21:01:59,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 21:01:59,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 21:01:59,932 INFO L87 Difference]: Start difference. First operand 63 states and 76 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 21:01:59,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 21:01:59,961 INFO L93 Difference]: Finished difference Result 65 states and 78 transitions. [2021-05-02 21:01:59,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 21:01:59,962 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 37 [2021-05-02 21:01:59,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 21:01:59,964 INFO L225 Difference]: With dead ends: 65 [2021-05-02 21:01:59,964 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 21:01:59,966 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 10.5ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 21:01:59,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 21:01:59,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2021-05-02 21:01:59,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 41 states have (on average 1.2195121951219512) internal successors, (50), 43 states have internal predecessors, (50), 15 states have call successors, (15), 9 states have call predecessors, (15), 8 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-02 21:01:59,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2021-05-02 21:01:59,975 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 37 [2021-05-02 21:01:59,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 21:01:59,975 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2021-05-02 21:01:59,975 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 21:01:59,975 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2021-05-02 21:01:59,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 21:01:59,977 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 21:01:59,977 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 21:02:00,184 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 21:02:00,185 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 21:02:00,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 21:02:00,185 INFO L82 PathProgramCache]: Analyzing trace with hash -599722260, now seen corresponding path program 1 times [2021-05-02 21:02:00,186 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 21:02:00,186 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [893064449] [2021-05-02 21:02:00,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 21:02:00,191 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 21:02:00,191 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [841838352] [2021-05-02 21:02:00,191 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 21:02:00,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 21:02:00,227 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 21:02:00,229 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 21:02:00,328 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 18 proven. 9 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 21:02:00,328 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 21:02:00,328 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [893064449] [2021-05-02 21:02:00,328 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 21:02:00,328 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [841838352] [2021-05-02 21:02:00,328 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [841838352] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 21:02:00,328 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 21:02:00,328 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 21:02:00,329 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369128127] [2021-05-02 21:02:00,329 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 21:02:00,329 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 21:02:00,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 21:02:00,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-02 21:02:00,330 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 9 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-02 21:02:00,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 21:02:00,535 INFO L93 Difference]: Finished difference Result 92 states and 116 transitions. [2021-05-02 21:02:00,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 21:02:00,535 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 4 states have call successors, (6) Word has length 40 [2021-05-02 21:02:00,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 21:02:00,536 INFO L225 Difference]: With dead ends: 92 [2021-05-02 21:02:00,536 INFO L226 Difference]: Without dead ends: 85 [2021-05-02 21:02:00,536 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 56.8ms TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-05-02 21:02:00,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-05-02 21:02:00,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 83. [2021-05-02 21:02:00,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 52 states have (on average 1.2115384615384615) internal successors, (63), 54 states have internal predecessors, (63), 20 states have call successors, (20), 11 states have call predecessors, (20), 10 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-02 21:02:00,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 101 transitions. [2021-05-02 21:02:00,540 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 101 transitions. Word has length 40 [2021-05-02 21:02:00,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 21:02:00,540 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 101 transitions. [2021-05-02 21:02:00,540 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-02 21:02:00,540 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 101 transitions. [2021-05-02 21:02:00,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 21:02:00,541 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 21:02:00,541 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 21:02:00,744 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 21:02:00,745 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 21:02:00,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 21:02:00,745 INFO L82 PathProgramCache]: Analyzing trace with hash 560903707, now seen corresponding path program 1 times [2021-05-02 21:02:00,745 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 21:02:00,745 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [581413261] [2021-05-02 21:02:00,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 21:02:00,760 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 21:02:00,760 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [747643504] [2021-05-02 21:02:00,760 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 21:02:00,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 21:02:00,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 21:02:00,814 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 21:02:00,824 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:00,825 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:00,826 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:00,830 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:00,831 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:00,832 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:00,856 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:00,858 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:00,858 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:00,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:00,883 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:00,898 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 36 proven. 42 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 21:02:00,898 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 21:02:00,898 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [581413261] [2021-05-02 21:02:00,898 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 21:02:00,898 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [747643504] [2021-05-02 21:02:00,898 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [747643504] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 21:02:00,898 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 21:02:00,898 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 21:02:00,898 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468788962] [2021-05-02 21:02:00,899 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 21:02:00,899 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 21:02:00,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 21:02:00,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 21:02:00,899 INFO L87 Difference]: Start difference. First operand 83 states and 101 transitions. Second operand has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 5 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-02 21:02:00,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 21:02:00,930 INFO L93 Difference]: Finished difference Result 92 states and 107 transitions. [2021-05-02 21:02:00,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 21:02:00,931 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 5 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 53 [2021-05-02 21:02:00,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 21:02:00,932 INFO L225 Difference]: With dead ends: 92 [2021-05-02 21:02:00,932 INFO L226 Difference]: Without dead ends: 92 [2021-05-02 21:02:00,932 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 9.8ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 21:02:00,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-05-02 21:02:00,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2021-05-02 21:02:00,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 58 states have (on average 1.1724137931034482) internal successors, (68), 60 states have internal predecessors, (68), 20 states have call successors, (20), 13 states have call predecessors, (20), 12 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-02 21:02:00,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 106 transitions. [2021-05-02 21:02:00,937 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 106 transitions. Word has length 53 [2021-05-02 21:02:00,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 21:02:00,937 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 106 transitions. [2021-05-02 21:02:00,937 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 5 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-02 21:02:00,937 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 106 transitions. [2021-05-02 21:02:00,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 21:02:00,938 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 21:02:00,938 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 21:02:01,143 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 21:02:01,143 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 21:02:01,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 21:02:01,143 INFO L82 PathProgramCache]: Analyzing trace with hash -1861566377, now seen corresponding path program 2 times [2021-05-02 21:02:01,143 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 21:02:01,143 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2020618059] [2021-05-02 21:02:01,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 21:02:01,149 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 21:02:01,149 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [869197822] [2021-05-02 21:02:01,149 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 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 21:02:01,193 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 21:02:01,194 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 21:02:01,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 21:02:01,196 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 21:02:01,206 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:01,209 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:01,209 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:01,213 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:01,214 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:01,215 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:01,237 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:01,239 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:01,241 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:01,271 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:01,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:01,293 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 36 proven. 46 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 21:02:01,293 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 21:02:01,293 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2020618059] [2021-05-02 21:02:01,293 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 21:02:01,293 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [869197822] [2021-05-02 21:02:01,294 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [869197822] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 21:02:01,294 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 21:02:01,294 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 21:02:01,294 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [199189369] [2021-05-02 21:02:01,294 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 21:02:01,294 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 21:02:01,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 21:02:01,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 21:02:01,295 INFO L87 Difference]: Start difference. First operand 91 states and 106 transitions. Second operand has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-02 21:02:01,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 21:02:01,333 INFO L93 Difference]: Finished difference Result 93 states and 108 transitions. [2021-05-02 21:02:01,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 21:02:01,333 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 55 [2021-05-02 21:02:01,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 21:02:01,337 INFO L225 Difference]: With dead ends: 93 [2021-05-02 21:02:01,337 INFO L226 Difference]: Without dead ends: 93 [2021-05-02 21:02:01,337 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 17.8ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-02 21:02:01,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-02 21:02:01,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2021-05-02 21:02:01,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 60 states have (on average 1.1666666666666667) internal successors, (70), 62 states have internal predecessors, (70), 20 states have call successors, (20), 13 states have call predecessors, (20), 12 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-02 21:02:01,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 108 transitions. [2021-05-02 21:02:01,343 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 108 transitions. Word has length 55 [2021-05-02 21:02:01,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 21:02:01,343 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 108 transitions. [2021-05-02 21:02:01,343 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-02 21:02:01,343 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 108 transitions. [2021-05-02 21:02:01,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-02 21:02:01,344 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 21:02:01,344 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 21:02:01,556 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 21:02:01,557 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 21:02:01,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 21:02:01,557 INFO L82 PathProgramCache]: Analyzing trace with hash 168202861, now seen corresponding path program 2 times [2021-05-02 21:02:01,557 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 21:02:01,558 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2099500104] [2021-05-02 21:02:01,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 21:02:01,562 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 21:02:01,562 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [474415010] [2021-05-02 21:02:01,563 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 21:02:01,604 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 21:02:01,604 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 21:02:01,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 21:02:01,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 21:02:01,754 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 33 proven. 20 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-05-02 21:02:01,754 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 21:02:01,754 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2099500104] [2021-05-02 21:02:01,755 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 21:02:01,755 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [474415010] [2021-05-02 21:02:01,755 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [474415010] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 21:02:01,755 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 21:02:01,755 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 21:02:01,755 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2825369] [2021-05-02 21:02:01,755 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 21:02:01,755 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 21:02:01,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 21:02:01,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-02 21:02:01,756 INFO L87 Difference]: Start difference. First operand 93 states and 108 transitions. Second operand has 10 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 5 states have call successors, (9) [2021-05-02 21:02:01,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 21:02:01,948 INFO L93 Difference]: Finished difference Result 128 states and 159 transitions. [2021-05-02 21:02:01,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 21:02:01,949 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 5 states have call successors, (9) Word has length 58 [2021-05-02 21:02:01,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 21:02:01,950 INFO L225 Difference]: With dead ends: 128 [2021-05-02 21:02:01,950 INFO L226 Difference]: Without dead ends: 121 [2021-05-02 21:02:01,950 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 69.0ms TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-05-02 21:02:01,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2021-05-02 21:02:01,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 115. [2021-05-02 21:02:01,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 73 states have (on average 1.1917808219178083) internal successors, (87), 76 states have internal predecessors, (87), 27 states have call successors, (27), 15 states have call predecessors, (27), 14 states have return successors, (25), 23 states have call predecessors, (25), 25 states have call successors, (25) [2021-05-02 21:02:01,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 139 transitions. [2021-05-02 21:02:01,954 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 139 transitions. Word has length 58 [2021-05-02 21:02:01,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 21:02:01,954 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 139 transitions. [2021-05-02 21:02:01,954 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 5 states have call successors, (9) [2021-05-02 21:02:01,954 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 139 transitions. [2021-05-02 21:02:01,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-02 21:02:01,954 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 21:02:01,954 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 21:02:02,168 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-02 21:02:02,169 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 21:02:02,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 21:02:02,170 INFO L82 PathProgramCache]: Analyzing trace with hash -454321759, now seen corresponding path program 1 times [2021-05-02 21:02:02,170 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 21:02:02,170 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1137902727] [2021-05-02 21:02:02,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 21:02:02,175 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 21:02:02,175 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2024089881] [2021-05-02 21:02:02,175 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 21:02:02,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 21:02:02,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 21:02:02,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 21:02:02,229 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:02,230 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:02,231 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:02,235 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:02,236 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:02,237 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:02,261 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:02,262 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:02,263 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:02,293 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:02,295 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:02,295 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:02,317 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:02,318 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:02,326 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 16 proven. 92 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 21:02:02,326 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 21:02:02,326 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1137902727] [2021-05-02 21:02:02,326 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 21:02:02,326 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2024089881] [2021-05-02 21:02:02,326 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2024089881] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 21:02:02,326 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 21:02:02,326 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 21:02:02,326 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208178771] [2021-05-02 21:02:02,328 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 21:02:02,328 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 21:02:02,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 21:02:02,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 21:02:02,330 INFO L87 Difference]: Start difference. First operand 115 states and 139 transitions. Second operand has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (11), 6 states have call predecessors, (11), 4 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-02 21:02:02,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 21:02:02,375 INFO L93 Difference]: Finished difference Result 132 states and 152 transitions. [2021-05-02 21:02:02,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 21:02:02,376 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (11), 6 states have call predecessors, (11), 4 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) Word has length 62 [2021-05-02 21:02:02,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 21:02:02,378 INFO L225 Difference]: With dead ends: 132 [2021-05-02 21:02:02,378 INFO L226 Difference]: Without dead ends: 132 [2021-05-02 21:02:02,378 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 17.4ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 21:02:02,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-05-02 21:02:02,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 131. [2021-05-02 21:02:02,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 86 states have (on average 1.1511627906976745) internal successors, (99), 88 states have internal predecessors, (99), 27 states have call successors, (27), 18 states have call predecessors, (27), 17 states have return successors, (25), 24 states have call predecessors, (25), 25 states have call successors, (25) [2021-05-02 21:02:02,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 151 transitions. [2021-05-02 21:02:02,384 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 151 transitions. Word has length 62 [2021-05-02 21:02:02,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 21:02:02,385 INFO L480 AbstractCegarLoop]: Abstraction has 131 states and 151 transitions. [2021-05-02 21:02:02,385 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (11), 6 states have call predecessors, (11), 4 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-02 21:02:02,385 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 151 transitions. [2021-05-02 21:02:02,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-02 21:02:02,385 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 21:02:02,385 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 21:02:02,603 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 21:02:02,604 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 21:02:02,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 21:02:02,604 INFO L82 PathProgramCache]: Analyzing trace with hash -453219492, now seen corresponding path program 1 times [2021-05-02 21:02:02,604 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 21:02:02,604 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1390224486] [2021-05-02 21:02:02,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 21:02:02,610 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 21:02:02,610 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [487164043] [2021-05-02 21:02:02,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 21:02:02,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 21:02:02,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-02 21:02:02,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 21:02:02,829 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 24 proven. 22 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-05-02 21:02:02,829 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 21:02:02,829 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1390224486] [2021-05-02 21:02:02,829 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 21:02:02,829 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [487164043] [2021-05-02 21:02:02,829 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [487164043] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 21:02:02,829 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 21:02:02,829 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 21:02:02,829 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247773253] [2021-05-02 21:02:02,830 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 21:02:02,830 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 21:02:02,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 21:02:02,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-02 21:02:02,830 INFO L87 Difference]: Start difference. First operand 131 states and 151 transitions. Second operand has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 4 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-02 21:02:02,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 21:02:02,973 INFO L93 Difference]: Finished difference Result 143 states and 168 transitions. [2021-05-02 21:02:02,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 21:02:02,974 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 4 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 62 [2021-05-02 21:02:02,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 21:02:02,975 INFO L225 Difference]: With dead ends: 143 [2021-05-02 21:02:02,975 INFO L226 Difference]: Without dead ends: 143 [2021-05-02 21:02:02,975 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 55.4ms TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-05-02 21:02:02,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-05-02 21:02:02,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 141. [2021-05-02 21:02:02,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 93 states have (on average 1.1720430107526882) internal successors, (109), 95 states have internal predecessors, (109), 29 states have call successors, (29), 19 states have call predecessors, (29), 18 states have return successors, (27), 26 states have call predecessors, (27), 27 states have call successors, (27) [2021-05-02 21:02:02,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 165 transitions. [2021-05-02 21:02:02,980 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 165 transitions. Word has length 62 [2021-05-02 21:02:02,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 21:02:02,980 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 165 transitions. [2021-05-02 21:02:02,980 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 4 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-02 21:02:02,980 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 165 transitions. [2021-05-02 21:02:02,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-02 21:02:02,981 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 21:02:02,981 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 9, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 21:02:03,192 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 21:02:03,193 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 21:02:03,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 21:02:03,193 INFO L82 PathProgramCache]: Analyzing trace with hash 1275197033, now seen corresponding path program 2 times [2021-05-02 21:02:03,193 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 21:02:03,194 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [334918106] [2021-05-02 21:02:03,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 21:02:03,199 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 21:02:03,199 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [173769409] [2021-05-02 21:02:03,199 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 21:02:03,251 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 21:02:03,251 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 21:02:03,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 21:02:03,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 21:02:03,381 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 26 proven. 26 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-05-02 21:02:03,381 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 21:02:03,381 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [334918106] [2021-05-02 21:02:03,382 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 21:02:03,382 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [173769409] [2021-05-02 21:02:03,382 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [173769409] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 21:02:03,382 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 21:02:03,382 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 21:02:03,382 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1176196292] [2021-05-02 21:02:03,382 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 21:02:03,382 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 21:02:03,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 21:02:03,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-05-02 21:02:03,383 INFO L87 Difference]: Start difference. First operand 141 states and 165 transitions. Second operand has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 5 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 4 states have call predecessors, (10), 5 states have call successors, (10) [2021-05-02 21:02:03,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 21:02:03,533 INFO L93 Difference]: Finished difference Result 144 states and 165 transitions. [2021-05-02 21:02:03,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 21:02:03,534 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), 5 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 4 states have call predecessors, (10), 5 states have call successors, (10) Word has length 67 [2021-05-02 21:02:03,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 21:02:03,535 INFO L225 Difference]: With dead ends: 144 [2021-05-02 21:02:03,535 INFO L226 Difference]: Without dead ends: 143 [2021-05-02 21:02:03,537 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 54.9ms TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-02 21:02:03,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-05-02 21:02:03,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 143. [2021-05-02 21:02:03,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 93 states have (on average 1.1397849462365592) internal successors, (106), 96 states have internal predecessors, (106), 30 states have call successors, (30), 20 states have call predecessors, (30), 19 states have return successors, (27), 26 states have call predecessors, (27), 27 states have call successors, (27) [2021-05-02 21:02:03,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 163 transitions. [2021-05-02 21:02:03,542 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 163 transitions. Word has length 67 [2021-05-02 21:02:03,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 21:02:03,543 INFO L480 AbstractCegarLoop]: Abstraction has 143 states and 163 transitions. [2021-05-02 21:02:03,543 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), 5 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 4 states have call predecessors, (10), 5 states have call successors, (10) [2021-05-02 21:02:03,543 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 163 transitions. [2021-05-02 21:02:03,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 21:02:03,543 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 21:02:03,543 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 10, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 21:02:03,752 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 21:02:03,753 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 21:02:03,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 21:02:03,753 INFO L82 PathProgramCache]: Analyzing trace with hash 929445032, now seen corresponding path program 1 times [2021-05-02 21:02:03,753 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 21:02:03,753 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [293073688] [2021-05-02 21:02:03,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 21:02:03,758 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 21:02:03,758 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1476477213] [2021-05-02 21:02:03,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 21:02:03,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 21:02:03,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 37 conjunts are in the unsatisfiable core [2021-05-02 21:02:03,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 21:02:03,967 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 28 proven. 30 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-05-02 21:02:03,968 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 21:02:03,968 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [293073688] [2021-05-02 21:02:03,968 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 21:02:03,968 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1476477213] [2021-05-02 21:02:03,968 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1476477213] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 21:02:03,968 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 21:02:03,968 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 21:02:03,968 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1016836544] [2021-05-02 21:02:03,968 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 21:02:03,968 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 21:02:03,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 21:02:03,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-02 21:02:03,969 INFO L87 Difference]: Start difference. First operand 143 states and 163 transitions. Second operand has 10 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 5 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) [2021-05-02 21:02:04,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 21:02:04,100 INFO L93 Difference]: Finished difference Result 147 states and 166 transitions. [2021-05-02 21:02:04,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 21:02:04,101 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 5 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) Word has length 73 [2021-05-02 21:02:04,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 21:02:04,101 INFO L225 Difference]: With dead ends: 147 [2021-05-02 21:02:04,101 INFO L226 Difference]: Without dead ends: 115 [2021-05-02 21:02:04,102 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 62.4ms TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-05-02 21:02:04,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-05-02 21:02:04,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2021-05-02 21:02:04,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 74 states have (on average 1.162162162162162) internal successors, (86), 76 states have internal predecessors, (86), 25 states have call successors, (25), 16 states have call predecessors, (25), 15 states have return successors, (23), 22 states have call predecessors, (23), 23 states have call successors, (23) [2021-05-02 21:02:04,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 134 transitions. [2021-05-02 21:02:04,105 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 134 transitions. Word has length 73 [2021-05-02 21:02:04,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 21:02:04,105 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 134 transitions. [2021-05-02 21:02:04,105 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 5 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) [2021-05-02 21:02:04,105 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 134 transitions. [2021-05-02 21:02:04,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 21:02:04,106 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 21:02:04,106 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 10, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 21:02:04,325 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 21:02:04,326 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 21:02:04,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 21:02:04,326 INFO L82 PathProgramCache]: Analyzing trace with hash 2088538806, now seen corresponding path program 3 times [2021-05-02 21:02:04,326 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 21:02:04,326 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [261310818] [2021-05-02 21:02:04,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 21:02:04,331 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 21:02:04,331 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1318799109] [2021-05-02 21:02:04,331 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 21:02:04,375 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 21:02:04,375 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 21:02:04,376 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 21:02:04,377 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 21:02:04,383 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:04,384 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:04,385 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:04,389 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:04,391 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:04,391 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:04,411 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:04,413 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:04,413 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:04,433 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:04,435 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:04,435 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:04,461 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:04,462 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:04,496 INFO L134 CoverageAnalysis]: Checked inductivity of 224 backedges. 54 proven. 132 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-05-02 21:02:04,496 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 21:02:04,498 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [261310818] [2021-05-02 21:02:04,498 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 21:02:04,498 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1318799109] [2021-05-02 21:02:04,498 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1318799109] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 21:02:04,498 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 21:02:04,498 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 21:02:04,500 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773336746] [2021-05-02 21:02:04,500 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 21:02:04,500 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 21:02:04,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 21:02:04,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 21:02:04,501 INFO L87 Difference]: Start difference. First operand 115 states and 134 transitions. Second operand has 7 states, 7 states have (on average 4.285714285714286) internal successors, (30), 6 states have internal predecessors, (30), 6 states have call successors, (13), 6 states have call predecessors, (13), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2021-05-02 21:02:04,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 21:02:04,555 INFO L93 Difference]: Finished difference Result 117 states and 136 transitions. [2021-05-02 21:02:04,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 21:02:04,556 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.285714285714286) internal successors, (30), 6 states have internal predecessors, (30), 6 states have call successors, (13), 6 states have call predecessors, (13), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) Word has length 73 [2021-05-02 21:02:04,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 21:02:04,556 INFO L225 Difference]: With dead ends: 117 [2021-05-02 21:02:04,556 INFO L226 Difference]: Without dead ends: 117 [2021-05-02 21:02:04,557 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 25.6ms TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-05-02 21:02:04,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-05-02 21:02:04,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2021-05-02 21:02:04,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 76 states have (on average 1.1578947368421053) internal successors, (88), 78 states have internal predecessors, (88), 25 states have call successors, (25), 16 states have call predecessors, (25), 15 states have return successors, (23), 22 states have call predecessors, (23), 23 states have call successors, (23) [2021-05-02 21:02:04,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 136 transitions. [2021-05-02 21:02:04,560 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 136 transitions. Word has length 73 [2021-05-02 21:02:04,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 21:02:04,560 INFO L480 AbstractCegarLoop]: Abstraction has 117 states and 136 transitions. [2021-05-02 21:02:04,560 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.285714285714286) internal successors, (30), 6 states have internal predecessors, (30), 6 states have call successors, (13), 6 states have call predecessors, (13), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2021-05-02 21:02:04,560 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 136 transitions. [2021-05-02 21:02:04,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-02 21:02:04,561 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 21:02:04,561 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 21:02:04,776 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 21:02:04,776 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 21:02:04,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 21:02:04,777 INFO L82 PathProgramCache]: Analyzing trace with hash -57233490, now seen corresponding path program 3 times [2021-05-02 21:02:04,777 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 21:02:04,777 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [548080785] [2021-05-02 21:02:04,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 21:02:04,782 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 21:02:04,782 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [932775542] [2021-05-02 21:02:04,782 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 21:02:04,819 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 21:02:04,819 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 21:02:04,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 21:02:04,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 21:02:04,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:04,999 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:05,020 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 95 proven. 8 refuted. 0 times theorem prover too weak. 172 trivial. 0 not checked. [2021-05-02 21:02:05,020 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 21:02:05,020 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [548080785] [2021-05-02 21:02:05,020 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 21:02:05,020 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [932775542] [2021-05-02 21:02:05,020 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [932775542] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 21:02:05,020 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 21:02:05,020 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 21:02:05,020 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1787927800] [2021-05-02 21:02:05,022 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 21:02:05,022 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 21:02:05,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 21:02:05,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-05-02 21:02:05,022 INFO L87 Difference]: Start difference. First operand 117 states and 136 transitions. Second operand has 11 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 6 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-02 21:02:05,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 21:02:05,203 INFO L93 Difference]: Finished difference Result 137 states and 164 transitions. [2021-05-02 21:02:05,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 21:02:05,203 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 6 states have call predecessors, (9), 4 states have call successors, (9) Word has length 76 [2021-05-02 21:02:05,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 21:02:05,204 INFO L225 Difference]: With dead ends: 137 [2021-05-02 21:02:05,204 INFO L226 Difference]: Without dead ends: 137 [2021-05-02 21:02:05,204 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 74.8ms TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-05-02 21:02:05,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-05-02 21:02:05,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 132. [2021-05-02 21:02:05,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 86 states have (on average 1.1744186046511629) internal successors, (101), 88 states have internal predecessors, (101), 29 states have call successors, (29), 17 states have call predecessors, (29), 16 states have return successors, (27), 26 states have call predecessors, (27), 27 states have call successors, (27) [2021-05-02 21:02:05,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 157 transitions. [2021-05-02 21:02:05,210 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 157 transitions. Word has length 76 [2021-05-02 21:02:05,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 21:02:05,211 INFO L480 AbstractCegarLoop]: Abstraction has 132 states and 157 transitions. [2021-05-02 21:02:05,211 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 6 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-02 21:02:05,211 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 157 transitions. [2021-05-02 21:02:05,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-05-02 21:02:05,211 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 21:02:05,211 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 21:02:05,424 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 21:02:05,425 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 21:02:05,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 21:02:05,425 INFO L82 PathProgramCache]: Analyzing trace with hash -1413927326, now seen corresponding path program 2 times [2021-05-02 21:02:05,425 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 21:02:05,425 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [671581903] [2021-05-02 21:02:05,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 21:02:05,430 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 21:02:05,430 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [671573310] [2021-05-02 21:02:05,430 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 21:02:05,480 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 21:02:05,480 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 21:02:05,481 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 21:02:05,482 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 21:02:05,490 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:05,491 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:05,492 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:05,495 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:05,496 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:05,496 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:05,524 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:05,525 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:05,526 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:05,549 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:05,550 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:05,550 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:05,584 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:05,586 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:05,586 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:05,605 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:05,606 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:05,614 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 22 proven. 200 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 21:02:05,614 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 21:02:05,614 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [671581903] [2021-05-02 21:02:05,614 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 21:02:05,614 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [671573310] [2021-05-02 21:02:05,614 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [671573310] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 21:02:05,614 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 21:02:05,614 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 21:02:05,615 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506685263] [2021-05-02 21:02:05,615 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 21:02:05,615 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 21:02:05,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 21:02:05,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 21:02:05,616 INFO L87 Difference]: Start difference. First operand 132 states and 157 transitions. Second operand has 8 states, 8 states have (on average 4.125) internal successors, (33), 7 states have internal predecessors, (33), 7 states have call successors, (14), 7 states have call predecessors, (14), 5 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2021-05-02 21:02:05,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 21:02:05,681 INFO L93 Difference]: Finished difference Result 161 states and 184 transitions. [2021-05-02 21:02:05,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 21:02:05,682 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.125) internal successors, (33), 7 states have internal predecessors, (33), 7 states have call successors, (14), 7 states have call predecessors, (14), 5 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) Word has length 80 [2021-05-02 21:02:05,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 21:02:05,683 INFO L225 Difference]: With dead ends: 161 [2021-05-02 21:02:05,683 INFO L226 Difference]: Without dead ends: 161 [2021-05-02 21:02:05,683 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 28.1ms TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-05-02 21:02:05,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-05-02 21:02:05,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 160. [2021-05-02 21:02:05,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 106 states have (on average 1.1415094339622642) internal successors, (121), 108 states have internal predecessors, (121), 32 states have call successors, (32), 22 states have call predecessors, (32), 21 states have return successors, (30), 29 states have call predecessors, (30), 30 states have call successors, (30) [2021-05-02 21:02:05,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 183 transitions. [2021-05-02 21:02:05,687 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 183 transitions. Word has length 80 [2021-05-02 21:02:05,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 21:02:05,687 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 183 transitions. [2021-05-02 21:02:05,687 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.125) internal successors, (33), 7 states have internal predecessors, (33), 7 states have call successors, (14), 7 states have call predecessors, (14), 5 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2021-05-02 21:02:05,688 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 183 transitions. [2021-05-02 21:02:05,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-05-02 21:02:05,688 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 21:02:05,688 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 21:02:05,896 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 21:02:05,897 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 21:02:05,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 21:02:05,897 INFO L82 PathProgramCache]: Analyzing trace with hash -1412825059, now seen corresponding path program 3 times [2021-05-02 21:02:05,897 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 21:02:05,897 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [794892492] [2021-05-02 21:02:05,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 21:02:05,902 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 21:02:05,902 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [227710730] [2021-05-02 21:02:05,902 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 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 21:02:05,949 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 21:02:05,949 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 21:02:05,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 21:02:05,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 21:02:06,081 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:06,090 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 22 proven. 21 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-05-02 21:02:06,090 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 21:02:06,090 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [794892492] [2021-05-02 21:02:06,090 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 21:02:06,090 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [227710730] [2021-05-02 21:02:06,091 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [227710730] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 21:02:06,091 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 21:02:06,091 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 21:02:06,091 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1939780295] [2021-05-02 21:02:06,091 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 21:02:06,091 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 21:02:06,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 21:02:06,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-02 21:02:06,092 INFO L87 Difference]: Start difference. First operand 160 states and 183 transitions. Second operand has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 5 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-02 21:02:06,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 21:02:06,208 INFO L93 Difference]: Finished difference Result 176 states and 203 transitions. [2021-05-02 21:02:06,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 21:02:06,208 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), 5 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 80 [2021-05-02 21:02:06,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 21:02:06,211 INFO L225 Difference]: With dead ends: 176 [2021-05-02 21:02:06,211 INFO L226 Difference]: Without dead ends: 176 [2021-05-02 21:02:06,211 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 42.3ms TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-02 21:02:06,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2021-05-02 21:02:06,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 174. [2021-05-02 21:02:06,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 116 states have (on average 1.1551724137931034) internal successors, (134), 118 states have internal predecessors, (134), 34 states have call successors, (34), 24 states have call predecessors, (34), 23 states have return successors, (32), 31 states have call predecessors, (32), 32 states have call successors, (32) [2021-05-02 21:02:06,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 200 transitions. [2021-05-02 21:02:06,216 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 200 transitions. Word has length 80 [2021-05-02 21:02:06,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 21:02:06,216 INFO L480 AbstractCegarLoop]: Abstraction has 174 states and 200 transitions. [2021-05-02 21:02:06,216 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), 5 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-02 21:02:06,216 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 200 transitions. [2021-05-02 21:02:06,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-02 21:02:06,217 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 21:02:06,217 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 21:02:06,417 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 21:02:06,418 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 21:02:06,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 21:02:06,418 INFO L82 PathProgramCache]: Analyzing trace with hash -1813499320, now seen corresponding path program 4 times [2021-05-02 21:02:06,418 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 21:02:06,418 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1656538756] [2021-05-02 21:02:06,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 21:02:06,423 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 21:02:06,423 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1806257573] [2021-05-02 21:02:06,423 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 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 21:02:06,478 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 21:02:06,479 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 21:02:06,480 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 46 conjunts are in the unsatisfiable core [2021-05-02 21:02:06,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 21:02:16,802 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:16,805 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:16,820 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:16,822 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:16,843 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:16,846 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:23,194 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:23,199 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:23,231 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:23,235 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:23,262 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:23,264 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:27,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:27,673 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:27,690 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:40,597 WARN L205 SmtUtils]: Spent 6.03 s on a formula simplification that was a NOOP. DAG size: 24 [2021-05-02 21:02:40,647 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 21:02:40,655 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 43 proven. 71 refuted. 8 times theorem prover too weak. 188 trivial. 0 not checked. [2021-05-02 21:02:40,655 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 21:02:40,655 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1656538756] [2021-05-02 21:02:40,655 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 21:02:40,655 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1806257573] [2021-05-02 21:02:40,655 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1806257573] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 21:02:40,655 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 21:02:40,655 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 21:02:40,655 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984734652] [2021-05-02 21:02:40,655 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 21:02:40,656 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 21:02:40,656 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 21:02:40,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=110, Unknown=13, NotChecked=0, Total=156 [2021-05-02 21:02:40,656 INFO L87 Difference]: Start difference. First operand 174 states and 200 transitions. Second operand has 13 states, 10 states have (on average 2.6) internal successors, (26), 9 states have internal predecessors, (26), 8 states have call successors, (15), 1 states have call predecessors, (15), 2 states have return successors, (13), 7 states have call predecessors, (13), 7 states have call successors, (13) [2021-05-02 21:03:11,355 WARN L205 SmtUtils]: Spent 4.03 s on a formula simplification that was a NOOP. DAG size: 19 [2021-05-02 21:03:29,079 WARN L205 SmtUtils]: Spent 4.03 s on a formula simplification that was a NOOP. DAG size: 26 [2021-05-02 21:03:55,953 WARN L205 SmtUtils]: Spent 6.15 s on a formula simplification that was a NOOP. DAG size: 28 [2021-05-02 21:04:16,136 WARN L205 SmtUtils]: Spent 20.16 s on a formula simplification. DAG size of input: 40 DAG size of output: 37 [2021-05-02 21:04:31,841 WARN L205 SmtUtils]: Spent 12.12 s on a formula simplification. DAG size of input: 32 DAG size of output: 31 [2021-05-02 21:04:43,973 WARN L205 SmtUtils]: Spent 12.10 s on a formula simplification. DAG size of input: 33 DAG size of output: 31 [2021-05-02 21:05:05,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 21:05:05,337 INFO L93 Difference]: Finished difference Result 196 states and 237 transitions. [2021-05-02 21:05:05,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 21:05:05,338 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 10 states have (on average 2.6) internal successors, (26), 9 states have internal predecessors, (26), 8 states have call successors, (15), 1 states have call predecessors, (15), 2 states have return successors, (13), 7 states have call predecessors, (13), 7 states have call successors, (13) Word has length 85 [2021-05-02 21:05:05,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 21:05:05,339 INFO L225 Difference]: With dead ends: 196 [2021-05-02 21:05:05,339 INFO L226 Difference]: Without dead ends: 0 [2021-05-02 21:05:05,339 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 119910.0ms TimeCoverageRelationStatistics Valid=83, Invalid=271, Unknown=26, NotChecked=0, Total=380 [2021-05-02 21:05:05,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-02 21:05:05,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-02 21:05:05,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-02 21:05:05,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-02 21:05:05,339 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 85 [2021-05-02 21:05:05,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 21:05:05,339 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-02 21:05:05,340 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 10 states have (on average 2.6) internal successors, (26), 9 states have internal predecessors, (26), 8 states have call successors, (15), 1 states have call predecessors, (15), 2 states have return successors, (13), 7 states have call predecessors, (13), 7 states have call successors, (13) [2021-05-02 21:05:05,340 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-02 21:05:05,340 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-02 21:05:05,552 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-05-02 21:05:05,557 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 09:05:05 BasicIcfg [2021-05-02 21:05:05,558 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 21:05:05,558 INFO L168 Benchmark]: Toolchain (without parser) took 188963.32 ms. Allocated memory was 186.6 MB in the beginning and 269.5 MB in the end (delta: 82.8 MB). Free memory was 152.4 MB in the beginning and 237.5 MB in the end (delta: -85.0 MB). There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 21:05:05,558 INFO L168 Benchmark]: CDTParser took 0.09 ms. Allocated memory is still 186.6 MB. Free memory is still 169.0 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 21:05:05,558 INFO L168 Benchmark]: CACSL2BoogieTranslator took 199.13 ms. Allocated memory is still 186.6 MB. Free memory was 152.2 MB in the beginning and 142.4 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-05-02 21:05:05,558 INFO L168 Benchmark]: Boogie Preprocessor took 48.98 ms. Allocated memory is still 186.6 MB. Free memory was 142.4 MB in the beginning and 169.7 MB in the end (delta: -27.3 MB). Peak memory consumption was 3.1 MB. Max. memory is 8.0 GB. [2021-05-02 21:05:05,558 INFO L168 Benchmark]: RCFGBuilder took 220.50 ms. Allocated memory is still 186.6 MB. Free memory was 169.7 MB in the beginning and 153.9 MB in the end (delta: 15.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. [2021-05-02 21:05:05,558 INFO L168 Benchmark]: IcfgTransformer took 35.36 ms. Allocated memory is still 186.6 MB. Free memory was 153.9 MB in the beginning and 152.4 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-02 21:05:05,558 INFO L168 Benchmark]: TraceAbstraction took 188451.46 ms. Allocated memory was 186.6 MB in the beginning and 269.5 MB in the end (delta: 82.8 MB). Free memory was 151.8 MB in the beginning and 237.5 MB in the end (delta: -85.6 MB). There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 21:05:05,559 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.09 ms. Allocated memory is still 186.6 MB. Free memory is still 169.0 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 199.13 ms. Allocated memory is still 186.6 MB. Free memory was 152.2 MB in the beginning and 142.4 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 48.98 ms. Allocated memory is still 186.6 MB. Free memory was 142.4 MB in the beginning and 169.7 MB in the end (delta: -27.3 MB). Peak memory consumption was 3.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 220.50 ms. Allocated memory is still 186.6 MB. Free memory was 169.7 MB in the beginning and 153.9 MB in the end (delta: 15.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. * IcfgTransformer took 35.36 ms. Allocated memory is still 186.6 MB. Free memory was 153.9 MB in the beginning and 152.4 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * TraceAbstraction took 188451.46 ms. Allocated memory was 186.6 MB in the beginning and 269.5 MB in the end (delta: 82.8 MB). Free memory was 151.8 MB in the beginning and 237.5 MB in the end (delta: -85.6 MB). There was no memory consumed. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 17]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 31 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 188382.2ms, OverallIterations: 21, TraceHistogramMax: 13, EmptinessCheckTime: 24.6ms, AutomataDifference: 146951.5ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 7.1ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 788 SDtfs, 376 SDslu, 2727 SDs, 0 SdLazy, 2690 SolverSat, 315 SolverUnsat, 24 SolverUnknown, 0 SolverNotchecked, 59395.4ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1036 GetRequests, 878 SyntacticMatches, 0 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 120885.2ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=174occurred in iteration=20, InterpolantAutomatonStates: 168, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 129.1ms AutomataMinimizationTime, 21 MinimizatonAttempts, 40 StatesRemovedByMinimization, 13 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 145.4ms SsaConstructionTime, 408.2ms SatisfiabilityAnalysisTime, 36485.6ms InterpolantComputationTime, 1038 NumberOfCodeBlocks, 955 NumberOfCodeBlocksAsserted, 32 NumberOfCheckSat, 1017 ConstructedInterpolants, 0 QuantifiedInterpolants, 4875 SizeOfPredicates, 70 NumberOfNonLiveVariables, 3230 ConjunctsInSsa, 367 ConjunctsInUnsatCore, 21 InterpolantComputations, 5 PerfectInterpolantSequences, 1741/2481 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! [MP z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forcibly destroying the process Received shutdown request...