/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/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/hard2_unwindbound50.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 03:34:11,249 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 03:34:11,252 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 03:34:11,295 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 03:34:11,316 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 03:34:11,319 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 03:34:11,320 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 03:34:11,322 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 03:34:11,325 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 03:34:11,326 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 03:34:11,329 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 03:34:11,336 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 03:34:11,338 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 03:34:11,341 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 03:34:11,342 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 03:34:11,343 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 03:34:11,345 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 03:34:11,351 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 03:34:11,351 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 03:34:11,352 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 03:34:11,353 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-06 03:34:11,383 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 03:34:11,383 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 03:34:11,385 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-06 03:34:11,385 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-06 03:34:11,385 INFO L138 SettingsManager]: * Use SBE=true [2021-05-06 03:34:11,385 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 03:34:11,385 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 03:34:11,385 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 03:34:11,385 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 03:34:11,386 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 03:34:11,386 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 03:34:11,386 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 03:34:11,386 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 03:34:11,386 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 03:34:11,386 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 03:34:11,386 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 03:34:11,387 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 03:34:11,387 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 03:34:11,387 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 03:34:11,387 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 03:34:11,387 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 03:34:11,387 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 03:34:11,387 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-06 03:34:11,388 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-06 03:34:11,388 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 03:34:11,388 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-06 03:34:11,388 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 03:34:11,388 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-06 03:34:11,391 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 03:34:11,703 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 03:34:11,721 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 03:34:11,723 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 03:34:11,724 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 03:34:11,725 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 03:34:11,726 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/hard2_unwindbound50.c [2021-05-06 03:34:11,782 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/668e44d6f/908d01ed35464f409b56ce55c4248186/FLAG449313117 [2021-05-06 03:34:12,296 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 03:34:12,296 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard2_unwindbound50.c [2021-05-06 03:34:12,303 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/668e44d6f/908d01ed35464f409b56ce55c4248186/FLAG449313117 [2021-05-06 03:34:12,772 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/668e44d6f/908d01ed35464f409b56ce55c4248186 [2021-05-06 03:34:12,774 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 03:34:12,776 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 03:34:12,780 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 03:34:12,780 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 03:34:12,784 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 03:34:12,784 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 03:34:12" (1/1) ... [2021-05-06 03:34:12,785 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6fc2bfb6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 03:34:12, skipping insertion in model container [2021-05-06 03:34:12,785 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 03:34:12" (1/1) ... [2021-05-06 03:34:12,792 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 03:34:12,808 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 03:34:12,903 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_unwindbound50.c[526,539] [2021-05-06 03:34:12,916 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 03:34:12,925 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 03:34:12,935 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_unwindbound50.c[526,539] [2021-05-06 03:34:12,940 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 03:34:12,952 INFO L208 MainTranslator]: Completed translation [2021-05-06 03:34:12,953 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 03:34:12 WrapperNode [2021-05-06 03:34:12,953 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 03:34:12,954 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 03:34:12,954 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 03:34:12,954 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 03:34:13,000 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 03:34:12" (1/1) ... [2021-05-06 03:34:13,001 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 03:34:12" (1/1) ... [2021-05-06 03:34:13,007 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 03:34:12" (1/1) ... [2021-05-06 03:34:13,008 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 03:34:12" (1/1) ... [2021-05-06 03:34:13,012 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 03:34:12" (1/1) ... [2021-05-06 03:34:13,016 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 03:34:12" (1/1) ... [2021-05-06 03:34:13,018 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 03:34:12" (1/1) ... [2021-05-06 03:34:13,020 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 03:34:13,021 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 03:34:13,021 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 03:34:13,021 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 03:34:13,022 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 03:34:12" (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 [2021-05-06 03:34:13,108 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 03:34:13,108 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 03:34:13,108 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 03:34:13,108 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 03:34:13,109 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 03:34:13,109 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 03:34:13,109 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 03:34:13,110 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 03:34:13,110 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 03:34:13,110 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 03:34:13,110 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-06 03:34:13,110 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 03:34:13,111 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 03:34:13,111 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 03:34:13,113 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 03:34:13,113 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 03:34:13,113 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 03:34:13,113 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 03:34:13,113 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 03:34:13,113 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 03:34:13,446 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 03:34:13,446 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-06 03:34:13,447 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 03:34:13 BoogieIcfgContainer [2021-05-06 03:34:13,448 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 03:34:13,449 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 03:34:13,449 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 03:34:13,452 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 03:34:13,452 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 03:34:12" (1/3) ... [2021-05-06 03:34:13,452 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5ca36abb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 03:34:13, skipping insertion in model container [2021-05-06 03:34:13,453 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 03:34:12" (2/3) ... [2021-05-06 03:34:13,453 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5ca36abb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 03:34:13, skipping insertion in model container [2021-05-06 03:34:13,453 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 03:34:13" (3/3) ... [2021-05-06 03:34:13,454 INFO L111 eAbstractionObserver]: Analyzing ICFG hard2_unwindbound50.c [2021-05-06 03:34:13,462 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-06 03:34:13,466 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 03:34:13,479 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 03:34:13,499 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 03:34:13,500 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 03:34:13,500 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-06 03:34:13,500 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 03:34:13,500 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 03:34:13,500 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 03:34:13,500 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 03:34:13,500 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 03:34:13,515 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) [2021-05-06 03:34:13,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 03:34:13,519 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:34:13,520 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:34:13,520 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:34:13,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:34:13,525 INFO L82 PathProgramCache]: Analyzing trace with hash -1682617676, now seen corresponding path program 1 times [2021-05-06 03:34:13,533 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:34:13,533 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [91168220] [2021-05-06 03:34:13,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:34:13,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:34:13,700 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 03:34:13,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:34:13,740 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 03:34:13,741 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:34:13,742 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [91168220] [2021-05-06 03:34:13,743 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [91168220] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 03:34:13,743 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 03:34:13,743 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 03:34:13,744 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1701276843] [2021-05-06 03:34:13,748 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 03:34:13,749 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:34:13,763 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 03:34:13,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 03:34:13,766 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) [2021-05-06 03:34:13,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:34:13,954 INFO L93 Difference]: Finished difference Result 57 states and 91 transitions. [2021-05-06 03:34:13,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 03:34:13,955 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 [2021-05-06 03:34:13,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:34:13,974 INFO L225 Difference]: With dead ends: 57 [2021-05-06 03:34:13,975 INFO L226 Difference]: Without dead ends: 27 [2021-05-06 03:34:13,977 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 50.6ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 03:34:13,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-06 03:34:14,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2021-05-06 03:34:14,006 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) [2021-05-06 03:34:14,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 36 transitions. [2021-05-06 03:34:14,008 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 36 transitions. Word has length 12 [2021-05-06 03:34:14,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:34:14,009 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 36 transitions. [2021-05-06 03:34:14,009 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) [2021-05-06 03:34:14,009 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 36 transitions. [2021-05-06 03:34:14,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 03:34:14,010 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:34:14,010 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:34:14,011 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 03:34:14,011 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:34:14,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:34:14,012 INFO L82 PathProgramCache]: Analyzing trace with hash -2144676086, now seen corresponding path program 1 times [2021-05-06 03:34:14,012 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:34:14,012 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2041410431] [2021-05-06 03:34:14,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:34:14,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:34:14,110 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 03:34:14,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:34:14,122 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 03:34:14,122 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:34:14,122 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2041410431] [2021-05-06 03:34:14,123 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2041410431] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 03:34:14,123 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 03:34:14,123 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 03:34:14,123 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2067829903] [2021-05-06 03:34:14,124 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 03:34:14,124 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:34:14,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 03:34:14,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 03:34:14,126 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) [2021-05-06 03:34:14,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:34:14,397 INFO L93 Difference]: Finished difference Result 41 states and 56 transitions. [2021-05-06 03:34:14,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 03:34:14,398 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 [2021-05-06 03:34:14,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:34:14,399 INFO L225 Difference]: With dead ends: 41 [2021-05-06 03:34:14,399 INFO L226 Difference]: Without dead ends: 39 [2021-05-06 03:34:14,400 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 161.1ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-06 03:34:14,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-06 03:34:14,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 30. [2021-05-06 03:34:14,410 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) [2021-05-06 03:34:14,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 39 transitions. [2021-05-06 03:34:14,411 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 39 transitions. Word has length 12 [2021-05-06 03:34:14,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:34:14,411 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 39 transitions. [2021-05-06 03:34:14,411 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) [2021-05-06 03:34:14,412 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 39 transitions. [2021-05-06 03:34:14,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-06 03:34:14,412 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:34:14,412 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:34:14,413 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 03:34:14,413 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:34:14,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:34:14,413 INFO L82 PathProgramCache]: Analyzing trace with hash 1842794081, now seen corresponding path program 1 times [2021-05-06 03:34:14,413 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:34:14,414 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [899516903] [2021-05-06 03:34:14,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:34:14,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:34:14,478 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 03:34:14,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:34:14,502 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 03:34:14,502 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:34:14,502 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [899516903] [2021-05-06 03:34:14,503 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [899516903] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 03:34:14,503 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 03:34:14,503 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 03:34:14,503 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1642221793] [2021-05-06 03:34:14,503 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 03:34:14,504 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:34:14,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 03:34:14,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 03:34:14,505 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) [2021-05-06 03:34:14,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:34:14,709 INFO L93 Difference]: Finished difference Result 46 states and 61 transitions. [2021-05-06 03:34:14,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 03:34:14,709 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 [2021-05-06 03:34:14,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:34:14,710 INFO L225 Difference]: With dead ends: 46 [2021-05-06 03:34:14,710 INFO L226 Difference]: Without dead ends: 32 [2021-05-06 03:34:14,711 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 81.0ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 03:34:14,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-06 03:34:14,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-06 03:34:14,719 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) [2021-05-06 03:34:14,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 41 transitions. [2021-05-06 03:34:14,720 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 41 transitions. Word has length 14 [2021-05-06 03:34:14,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:34:14,720 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 41 transitions. [2021-05-06 03:34:14,720 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) [2021-05-06 03:34:14,721 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 41 transitions. [2021-05-06 03:34:14,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 03:34:14,721 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:34:14,721 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:34:14,721 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-06 03:34:14,722 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:34:14,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:34:14,722 INFO L82 PathProgramCache]: Analyzing trace with hash 311129497, now seen corresponding path program 1 times [2021-05-06 03:34:14,723 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:34:14,723 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1925393072] [2021-05-06 03:34:14,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:34:14,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:34:14,815 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 03:34:14,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:34:14,824 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-05-06 03:34:14,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:34:14,830 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 03:34:14,831 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:34:14,831 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1925393072] [2021-05-06 03:34:14,831 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1925393072] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 03:34:14,831 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 03:34:14,831 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 03:34:14,831 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075642580] [2021-05-06 03:34:14,832 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 03:34:14,832 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:34:14,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 03:34:14,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 03:34:14,833 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) [2021-05-06 03:34:15,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:34:15,103 INFO L93 Difference]: Finished difference Result 46 states and 60 transitions. [2021-05-06 03:34:15,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 03:34:15,104 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 [2021-05-06 03:34:15,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:34:15,106 INFO L225 Difference]: With dead ends: 46 [2021-05-06 03:34:15,106 INFO L226 Difference]: Without dead ends: 44 [2021-05-06 03:34:15,107 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 161.2ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-06 03:34:15,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-06 03:34:15,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 36. [2021-05-06 03:34:15,125 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) [2021-05-06 03:34:15,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 44 transitions. [2021-05-06 03:34:15,128 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 44 transitions. Word has length 17 [2021-05-06 03:34:15,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:34:15,129 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 44 transitions. [2021-05-06 03:34:15,129 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) [2021-05-06 03:34:15,129 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 44 transitions. [2021-05-06 03:34:15,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-06 03:34:15,130 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:34:15,130 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:34:15,130 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-06 03:34:15,130 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:34:15,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:34:15,131 INFO L82 PathProgramCache]: Analyzing trace with hash -1912623062, now seen corresponding path program 1 times [2021-05-06 03:34:15,131 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:34:15,131 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1342153295] [2021-05-06 03:34:15,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:34:15,162 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:34:15,162 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [45490226] [2021-05-06 03:34:15,162 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 [2021-05-06 03:34:15,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:34:15,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 03:34:15,261 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:34:15,388 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:15,412 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 03:34:15,412 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:34:15,413 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1342153295] [2021-05-06 03:34:15,413 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:34:15,413 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [45490226] [2021-05-06 03:34:15,413 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [45490226] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 03:34:15,413 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 03:34:15,413 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 03:34:15,414 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1381213691] [2021-05-06 03:34:15,414 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 03:34:15,414 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:34:15,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 03:34:15,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 03:34:15,415 INFO L87 Difference]: Start difference. First operand 36 states and 44 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 03:34:15,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:34:15,494 INFO L93 Difference]: Finished difference Result 65 states and 87 transitions. [2021-05-06 03:34:15,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 03:34:15,495 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 22 [2021-05-06 03:34:15,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:34:15,497 INFO L225 Difference]: With dead ends: 65 [2021-05-06 03:34:15,497 INFO L226 Difference]: Without dead ends: 50 [2021-05-06 03:34:15,498 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 29.5ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 03:34:15,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-06 03:34:15,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-05-06 03:34:15,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 31 states have internal predecessors, (37), 15 states have call successors, (15), 6 states have call predecessors, (15), 5 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-06 03:34:15,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 64 transitions. [2021-05-06 03:34:15,519 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 64 transitions. Word has length 22 [2021-05-06 03:34:15,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:34:15,519 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 64 transitions. [2021-05-06 03:34:15,520 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 03:34:15,520 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 64 transitions. [2021-05-06 03:34:15,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-06 03:34:15,524 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:34:15,525 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] [2021-05-06 03:34:15,741 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:34:15,741 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:34:15,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:34:15,742 INFO L82 PathProgramCache]: Analyzing trace with hash 214651490, now seen corresponding path program 1 times [2021-05-06 03:34:15,742 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:34:15,742 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [417298048] [2021-05-06 03:34:15,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:34:15,751 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:34:15,751 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [257555826] [2021-05-06 03:34:15,751 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 [2021-05-06 03:34:15,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:34:15,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 03:34:15,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:34:15,823 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:15,827 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:15,829 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:15,836 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:15,839 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:15,840 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:15,878 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:15,881 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:15,894 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-06 03:34:15,894 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:34:15,894 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [417298048] [2021-05-06 03:34:15,894 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:34:15,895 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [257555826] [2021-05-06 03:34:15,895 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [257555826] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 03:34:15,895 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 03:34:15,895 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 03:34:15,895 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287554734] [2021-05-06 03:34:15,895 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 03:34:15,895 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:34:15,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 03:34:15,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 03:34:15,896 INFO L87 Difference]: Start difference. First operand 50 states and 64 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) [2021-05-06 03:34:15,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:34:15,928 INFO L93 Difference]: Finished difference Result 70 states and 80 transitions. [2021-05-06 03:34:15,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 03:34:15,929 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 [2021-05-06 03:34:15,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:34:15,930 INFO L225 Difference]: With dead ends: 70 [2021-05-06 03:34:15,930 INFO L226 Difference]: Without dead ends: 63 [2021-05-06 03:34:15,930 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 9.2ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 03:34:15,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-06 03:34:15,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2021-05-06 03:34:15,937 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) [2021-05-06 03:34:15,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 72 transitions. [2021-05-06 03:34:15,938 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 72 transitions. Word has length 30 [2021-05-06 03:34:15,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:34:15,938 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 72 transitions. [2021-05-06 03:34:15,938 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) [2021-05-06 03:34:15,938 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 72 transitions. [2021-05-06 03:34:15,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-06 03:34:15,939 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:34:15,939 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] [2021-05-06 03:34:16,160 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:34:16,161 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:34:16,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:34:16,161 INFO L82 PathProgramCache]: Analyzing trace with hash 216379368, now seen corresponding path program 1 times [2021-05-06 03:34:16,162 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:34:16,162 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1309716179] [2021-05-06 03:34:16,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:34:16,170 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:34:16,171 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [499970605] [2021-05-06 03:34:16,171 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 [2021-05-06 03:34:16,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:34:16,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 03:34:16,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:34:16,314 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:16,324 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-06 03:34:16,324 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:34:16,324 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1309716179] [2021-05-06 03:34:16,324 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:34:16,324 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [499970605] [2021-05-06 03:34:16,325 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [499970605] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 03:34:16,325 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 03:34:16,325 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 03:34:16,325 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [62746797] [2021-05-06 03:34:16,325 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 03:34:16,326 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:34:16,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 03:34:16,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 03:34:16,326 INFO L87 Difference]: Start difference. First operand 62 states and 72 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 03:34:16,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:34:16,380 INFO L93 Difference]: Finished difference Result 76 states and 91 transitions. [2021-05-06 03:34:16,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 03:34:16,381 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), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 30 [2021-05-06 03:34:16,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:34:16,382 INFO L225 Difference]: With dead ends: 76 [2021-05-06 03:34:16,382 INFO L226 Difference]: Without dead ends: 64 [2021-05-06 03:34:16,383 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 19.5ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 03:34:16,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-06 03:34:16,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2021-05-06 03:34:16,390 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) [2021-05-06 03:34:16,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 76 transitions. [2021-05-06 03:34:16,391 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 76 transitions. Word has length 30 [2021-05-06 03:34:16,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:34:16,391 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 76 transitions. [2021-05-06 03:34:16,391 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), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 03:34:16,392 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 76 transitions. [2021-05-06 03:34:16,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-06 03:34:16,393 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:34:16,393 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] [2021-05-06 03:34:16,618 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:34:16,619 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:34:16,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:34:16,619 INFO L82 PathProgramCache]: Analyzing trace with hash -1255015940, now seen corresponding path program 1 times [2021-05-06 03:34:16,619 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:34:16,619 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1558064348] [2021-05-06 03:34:16,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:34:16,626 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:34:16,626 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [612772656] [2021-05-06 03:34:16,626 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 [2021-05-06 03:34:16,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:34:16,699 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 03:34:16,701 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:34:16,717 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:16,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:16,722 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:16,729 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:16,732 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:16,735 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:16,775 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:16,783 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:16,808 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 18 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-05-06 03:34:16,808 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:34:16,809 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1558064348] [2021-05-06 03:34:16,809 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:34:16,809 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [612772656] [2021-05-06 03:34:16,809 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [612772656] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:34:16,809 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:34:16,809 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-06 03:34:16,809 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1495590665] [2021-05-06 03:34:16,814 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 03:34:16,814 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:34:16,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 03:34:16,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 03:34:16,815 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) [2021-05-06 03:34:16,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:34:16,861 INFO L93 Difference]: Finished difference Result 90 states and 114 transitions. [2021-05-06 03:34:16,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 03:34:16,861 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 [2021-05-06 03:34:16,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:34:16,866 INFO L225 Difference]: With dead ends: 90 [2021-05-06 03:34:16,867 INFO L226 Difference]: Without dead ends: 65 [2021-05-06 03:34:16,872 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 19.4ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 03:34:16,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-06 03:34:16,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2021-05-06 03:34:16,886 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) [2021-05-06 03:34:16,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2021-05-06 03:34:16,887 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 37 [2021-05-06 03:34:16,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:34:16,888 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2021-05-06 03:34:16,888 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) [2021-05-06 03:34:16,888 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2021-05-06 03:34:16,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-06 03:34:16,890 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:34:16,890 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] [2021-05-06 03:34:17,092 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:34:17,093 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:34:17,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:34:17,094 INFO L82 PathProgramCache]: Analyzing trace with hash -1057559728, now seen corresponding path program 1 times [2021-05-06 03:34:17,094 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:34:17,094 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2064472304] [2021-05-06 03:34:17,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:34:17,101 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:34:17,102 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [416822213] [2021-05-06 03:34:17,102 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 [2021-05-06 03:34:17,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:34:17,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-06 03:34:17,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:34:17,276 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:17,286 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-06 03:34:17,286 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:34:17,286 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2064472304] [2021-05-06 03:34:17,287 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:34:17,287 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [416822213] [2021-05-06 03:34:17,287 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [416822213] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:34:17,287 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:34:17,287 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 03:34:17,287 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837627871] [2021-05-06 03:34:17,287 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 03:34:17,287 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:34:17,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 03:34:17,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 03:34:17,288 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-06 03:34:17,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:34:17,395 INFO L93 Difference]: Finished difference Result 119 states and 162 transitions. [2021-05-06 03:34:17,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 03:34:17,396 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 40 [2021-05-06 03:34:17,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:34:17,397 INFO L225 Difference]: With dead ends: 119 [2021-05-06 03:34:17,397 INFO L226 Difference]: Without dead ends: 87 [2021-05-06 03:34:17,398 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 27.7ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-06 03:34:17,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-06 03:34:17,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 85. [2021-05-06 03:34:17,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 52 states have (on average 1.2307692307692308) internal successors, (64), 55 states have internal predecessors, (64), 23 states have call successors, (23), 10 states have call predecessors, (23), 9 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2021-05-06 03:34:17,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 107 transitions. [2021-05-06 03:34:17,407 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 107 transitions. Word has length 40 [2021-05-06 03:34:17,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:34:17,407 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 107 transitions. [2021-05-06 03:34:17,407 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-06 03:34:17,408 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 107 transitions. [2021-05-06 03:34:17,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-06 03:34:17,408 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:34:17,409 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] [2021-05-06 03:34:17,623 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:34:17,624 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:34:17,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:34:17,624 INFO L82 PathProgramCache]: Analyzing trace with hash 529029787, now seen corresponding path program 1 times [2021-05-06 03:34:17,625 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:34:17,625 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [804768869] [2021-05-06 03:34:17,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:34:17,631 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:34:17,632 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [788239288] [2021-05-06 03:34:17,632 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 [2021-05-06 03:34:17,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:34:17,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 03:34:17,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:34:17,704 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:17,706 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:17,707 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:17,711 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:17,714 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:17,715 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:17,752 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:17,756 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:17,757 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:17,787 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:17,792 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:17,813 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 36 proven. 42 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-06 03:34:17,814 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:34:17,814 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [804768869] [2021-05-06 03:34:17,814 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:34:17,814 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [788239288] [2021-05-06 03:34:17,814 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [788239288] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:34:17,814 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:34:17,814 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 03:34:17,814 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256151468] [2021-05-06 03:34:17,815 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 03:34:17,815 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:34:17,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 03:34:17,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 03:34:17,816 INFO L87 Difference]: Start difference. First operand 85 states and 107 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) [2021-05-06 03:34:17,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:34:17,873 INFO L93 Difference]: Finished difference Result 110 states and 128 transitions. [2021-05-06 03:34:17,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 03:34:17,874 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 [2021-05-06 03:34:17,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:34:17,876 INFO L225 Difference]: With dead ends: 110 [2021-05-06 03:34:17,876 INFO L226 Difference]: Without dead ends: 98 [2021-05-06 03:34:17,876 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 12.8ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 03:34:17,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-05-06 03:34:17,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2021-05-06 03:34:17,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 61 states have (on average 1.180327868852459) internal successors, (72), 64 states have internal predecessors, (72), 23 states have call successors, (23), 13 states have call predecessors, (23), 12 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2021-05-06 03:34:17,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 115 transitions. [2021-05-06 03:34:17,899 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 115 transitions. Word has length 53 [2021-05-06 03:34:17,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:34:17,901 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 115 transitions. [2021-05-06 03:34:17,901 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) [2021-05-06 03:34:17,902 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 115 transitions. [2021-05-06 03:34:17,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 03:34:17,906 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:34:17,906 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] [2021-05-06 03:34:18,120 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:34:18,121 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:34:18,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:34:18,121 INFO L82 PathProgramCache]: Analyzing trace with hash 1864650262, now seen corresponding path program 2 times [2021-05-06 03:34:18,122 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:34:18,122 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [704110532] [2021-05-06 03:34:18,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:34:18,129 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:34:18,129 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1378374666] [2021-05-06 03:34:18,129 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 [2021-05-06 03:34:18,210 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 03:34:18,211 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 03:34:18,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 03:34:18,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:34:18,235 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:18,237 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:18,238 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:18,245 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:18,247 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:18,254 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:18,284 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:18,287 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:18,288 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:18,318 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:18,320 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:18,337 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 36 proven. 46 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-06 03:34:18,337 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:34:18,337 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [704110532] [2021-05-06 03:34:18,338 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:34:18,338 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1378374666] [2021-05-06 03:34:18,338 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1378374666] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:34:18,338 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:34:18,338 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 03:34:18,338 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069862371] [2021-05-06 03:34:18,338 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 03:34:18,338 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:34:18,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 03:34:18,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 03:34:18,339 INFO L87 Difference]: Start difference. First operand 97 states and 115 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) [2021-05-06 03:34:18,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:34:18,390 INFO L93 Difference]: Finished difference Result 124 states and 153 transitions. [2021-05-06 03:34:18,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 03:34:18,390 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 [2021-05-06 03:34:18,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:34:18,394 INFO L225 Difference]: With dead ends: 124 [2021-05-06 03:34:18,394 INFO L226 Difference]: Without dead ends: 99 [2021-05-06 03:34:18,395 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 19.3ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-06 03:34:18,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-05-06 03:34:18,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2021-05-06 03:34:18,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 63 states have (on average 1.1746031746031746) internal successors, (74), 66 states have internal predecessors, (74), 23 states have call successors, (23), 13 states have call predecessors, (23), 12 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2021-05-06 03:34:18,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 117 transitions. [2021-05-06 03:34:18,407 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 117 transitions. Word has length 55 [2021-05-06 03:34:18,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:34:18,407 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 117 transitions. [2021-05-06 03:34:18,407 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) [2021-05-06 03:34:18,407 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 117 transitions. [2021-05-06 03:34:18,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 03:34:18,411 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:34:18,411 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] [2021-05-06 03:34:18,635 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:34:18,637 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:34:18,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:34:18,637 INFO L82 PathProgramCache]: Analyzing trace with hash -1879054090, now seen corresponding path program 2 times [2021-05-06 03:34:18,637 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:34:18,637 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1087570122] [2021-05-06 03:34:18,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:34:18,643 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:34:18,644 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [76824896] [2021-05-06 03:34:18,644 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 [2021-05-06 03:34:18,697 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 03:34:18,697 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 03:34:18,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-06 03:34:18,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:34:18,829 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:18,838 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 16 proven. 16 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-05-06 03:34:18,838 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:34:18,838 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1087570122] [2021-05-06 03:34:18,838 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:34:18,839 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [76824896] [2021-05-06 03:34:18,839 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [76824896] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:34:18,839 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:34:18,839 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 03:34:18,839 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [566182934] [2021-05-06 03:34:18,840 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 03:34:18,840 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:34:18,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 03:34:18,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-06 03:34:18,841 INFO L87 Difference]: Start difference. First operand 99 states and 117 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-06 03:34:18,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:34:18,988 INFO L93 Difference]: Finished difference Result 168 states and 228 transitions. [2021-05-06 03:34:18,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 03:34:18,988 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), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) Word has length 58 [2021-05-06 03:34:18,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:34:18,990 INFO L225 Difference]: With dead ends: 168 [2021-05-06 03:34:18,990 INFO L226 Difference]: Without dead ends: 136 [2021-05-06 03:34:18,990 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 34.6ms TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-06 03:34:18,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-05-06 03:34:18,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 129. [2021-05-06 03:34:19,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 81 states have (on average 1.2222222222222223) internal successors, (99), 85 states have internal predecessors, (99), 34 states have call successors, (34), 14 states have call predecessors, (34), 13 states have return successors, (31), 29 states have call predecessors, (31), 31 states have call successors, (31) [2021-05-06 03:34:19,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 164 transitions. [2021-05-06 03:34:19,001 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 164 transitions. Word has length 58 [2021-05-06 03:34:19,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:34:19,001 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 164 transitions. [2021-05-06 03:34:19,001 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), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-06 03:34:19,002 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 164 transitions. [2021-05-06 03:34:19,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-06 03:34:19,002 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:34:19,002 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] [2021-05-06 03:34:19,216 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-06 03:34:19,217 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:34:19,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:34:19,217 INFO L82 PathProgramCache]: Analyzing trace with hash -43330764, now seen corresponding path program 1 times [2021-05-06 03:34:19,217 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:34:19,218 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [681706143] [2021-05-06 03:34:19,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:34:19,223 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:34:19,224 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1087963834] [2021-05-06 03:34:19,224 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 [2021-05-06 03:34:19,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:34:19,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 03:34:19,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:34:19,295 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:19,297 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:19,298 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:19,303 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:19,304 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:19,305 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:19,332 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:19,337 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:19,338 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:19,370 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:19,371 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:19,372 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:19,397 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:19,398 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:19,408 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 16 proven. 92 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-06 03:34:19,408 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:34:19,408 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [681706143] [2021-05-06 03:34:19,408 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:34:19,408 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1087963834] [2021-05-06 03:34:19,409 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1087963834] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:34:19,409 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:34:19,409 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 03:34:19,409 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1852241836] [2021-05-06 03:34:19,409 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 03:34:19,409 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:34:19,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 03:34:19,410 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-06 03:34:19,410 INFO L87 Difference]: Start difference. First operand 129 states and 164 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) [2021-05-06 03:34:19,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:34:19,490 INFO L93 Difference]: Finished difference Result 163 states and 192 transitions. [2021-05-06 03:34:19,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 03:34:19,490 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 [2021-05-06 03:34:19,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:34:19,492 INFO L225 Difference]: With dead ends: 163 [2021-05-06 03:34:19,492 INFO L226 Difference]: Without dead ends: 150 [2021-05-06 03:34:19,492 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 20.5ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-06 03:34:19,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-05-06 03:34:19,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 149. [2021-05-06 03:34:19,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 96 states have (on average 1.1666666666666667) internal successors, (112), 100 states have internal predecessors, (112), 34 states have call successors, (34), 19 states have call predecessors, (34), 18 states have return successors, (31), 29 states have call predecessors, (31), 31 states have call successors, (31) [2021-05-06 03:34:19,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 177 transitions. [2021-05-06 03:34:19,503 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 177 transitions. Word has length 62 [2021-05-06 03:34:19,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:34:19,503 INFO L480 AbstractCegarLoop]: Abstraction has 149 states and 177 transitions. [2021-05-06 03:34:19,503 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) [2021-05-06 03:34:19,504 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 177 transitions. [2021-05-06 03:34:19,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-06 03:34:19,504 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:34:19,504 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] [2021-05-06 03:34:19,721 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:34:19,721 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:34:19,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:34:19,721 INFO L82 PathProgramCache]: Analyzing trace with hash -41602886, now seen corresponding path program 1 times [2021-05-06 03:34:19,721 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:34:19,722 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [236526249] [2021-05-06 03:34:19,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:34:19,728 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:34:19,728 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [177845221] [2021-05-06 03:34:19,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2021-05-06 03:34:19,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:34:19,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-06 03:34:19,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:34:19,945 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:19,954 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-05-06 03:34:19,954 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:34:19,954 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [236526249] [2021-05-06 03:34:19,954 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:34:19,954 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [177845221] [2021-05-06 03:34:19,955 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [177845221] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:34:19,955 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:34:19,955 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 03:34:19,955 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [728567942] [2021-05-06 03:34:19,955 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 03:34:19,955 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:34:19,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 03:34:19,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-06 03:34:19,956 INFO L87 Difference]: Start difference. First operand 149 states and 177 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-06 03:34:20,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:34:20,042 INFO L93 Difference]: Finished difference Result 157 states and 184 transitions. [2021-05-06 03:34:20,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 03:34:20,043 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 62 [2021-05-06 03:34:20,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:34:20,044 INFO L225 Difference]: With dead ends: 157 [2021-05-06 03:34:20,044 INFO L226 Difference]: Without dead ends: 155 [2021-05-06 03:34:20,045 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 39.9ms TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-06 03:34:20,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-05-06 03:34:20,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 153. [2021-05-06 03:34:20,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 99 states have (on average 1.1616161616161615) internal successors, (115), 103 states have internal predecessors, (115), 34 states have call successors, (34), 20 states have call predecessors, (34), 19 states have return successors, (31), 29 states have call predecessors, (31), 31 states have call successors, (31) [2021-05-06 03:34:20,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 180 transitions. [2021-05-06 03:34:20,055 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 180 transitions. Word has length 62 [2021-05-06 03:34:20,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:34:20,056 INFO L480 AbstractCegarLoop]: Abstraction has 153 states and 180 transitions. [2021-05-06 03:34:20,056 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-06 03:34:20,056 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 180 transitions. [2021-05-06 03:34:20,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 03:34:20,057 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:34:20,057 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] [2021-05-06 03:34:20,272 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:34:20,273 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:34:20,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:34:20,273 INFO L82 PathProgramCache]: Analyzing trace with hash 73149133, now seen corresponding path program 1 times [2021-05-06 03:34:20,273 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:34:20,273 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1864593250] [2021-05-06 03:34:20,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:34:20,280 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:34:20,280 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [396729382] [2021-05-06 03:34:20,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2021-05-06 03:34:20,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:34:20,339 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-06 03:34:20,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:34:20,482 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:20,491 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 20 proven. 11 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-05-06 03:34:20,492 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:34:20,492 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1864593250] [2021-05-06 03:34:20,492 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:34:20,492 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [396729382] [2021-05-06 03:34:20,492 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [396729382] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:34:20,492 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:34:20,492 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-06 03:34:20,492 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2113651699] [2021-05-06 03:34:20,493 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 03:34:20,493 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:34:20,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 03:34:20,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-06 03:34:20,493 INFO L87 Difference]: Start difference. First operand 153 states and 180 transitions. Second operand has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 5 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) [2021-05-06 03:34:20,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:34:20,581 INFO L93 Difference]: Finished difference Result 161 states and 187 transitions. [2021-05-06 03:34:20,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 03:34:20,582 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 5 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) Word has length 73 [2021-05-06 03:34:20,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:34:20,583 INFO L225 Difference]: With dead ends: 161 [2021-05-06 03:34:20,583 INFO L226 Difference]: Without dead ends: 127 [2021-05-06 03:34:20,583 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 46.8ms TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-06 03:34:20,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-05-06 03:34:20,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2021-05-06 03:34:20,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 81 states have (on average 1.1851851851851851) internal successors, (96), 84 states have internal predecessors, (96), 30 states have call successors, (30), 16 states have call predecessors, (30), 15 states have return successors, (27), 26 states have call predecessors, (27), 27 states have call successors, (27) [2021-05-06 03:34:20,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 153 transitions. [2021-05-06 03:34:20,604 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 153 transitions. Word has length 73 [2021-05-06 03:34:20,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:34:20,604 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 153 transitions. [2021-05-06 03:34:20,605 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 5 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) [2021-05-06 03:34:20,605 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 153 transitions. [2021-05-06 03:34:20,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 03:34:20,605 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:34:20,605 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] [2021-05-06 03:34:20,806 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-06 03:34:20,806 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:34:20,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:34:20,806 INFO L82 PathProgramCache]: Analyzing trace with hash 469209008, now seen corresponding path program 3 times [2021-05-06 03:34:20,806 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:34:20,807 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [871219654] [2021-05-06 03:34:20,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:34:20,817 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:34:20,818 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1478753760] [2021-05-06 03:34:20,818 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:34:20,866 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-06 03:34:20,866 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 03:34:20,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 03:34:20,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:34:20,878 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:20,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:20,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:20,885 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:20,887 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:20,887 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:20,914 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:20,916 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:20,916 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:20,943 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:20,944 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:20,945 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:20,972 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:20,973 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:20,989 INFO L134 CoverageAnalysis]: Checked inductivity of 224 backedges. 54 proven. 132 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-05-06 03:34:20,989 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:34:20,989 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [871219654] [2021-05-06 03:34:20,989 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:34:20,990 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1478753760] [2021-05-06 03:34:20,990 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1478753760] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:34:20,990 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:34:20,990 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 03:34:20,990 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749339463] [2021-05-06 03:34:20,990 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 03:34:20,990 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:34:20,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 03:34:20,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-06 03:34:20,991 INFO L87 Difference]: Start difference. First operand 127 states and 153 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) [2021-05-06 03:34:21,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:34:21,061 INFO L93 Difference]: Finished difference Result 154 states and 191 transitions. [2021-05-06 03:34:21,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 03:34:21,062 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 [2021-05-06 03:34:21,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:34:21,063 INFO L225 Difference]: With dead ends: 154 [2021-05-06 03:34:21,063 INFO L226 Difference]: Without dead ends: 129 [2021-05-06 03:34:21,063 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 29.2ms TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-05-06 03:34:21,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-05-06 03:34:21,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 129. [2021-05-06 03:34:21,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 83 states have (on average 1.180722891566265) internal successors, (98), 86 states have internal predecessors, (98), 30 states have call successors, (30), 16 states have call predecessors, (30), 15 states have return successors, (27), 26 states have call predecessors, (27), 27 states have call successors, (27) [2021-05-06 03:34:21,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 155 transitions. [2021-05-06 03:34:21,071 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 155 transitions. Word has length 73 [2021-05-06 03:34:21,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:34:21,072 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 155 transitions. [2021-05-06 03:34:21,072 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) [2021-05-06 03:34:21,072 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 155 transitions. [2021-05-06 03:34:21,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 03:34:21,073 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:34:21,073 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] [2021-05-06 03:34:21,299 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-06 03:34:21,300 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:34:21,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:34:21,300 INFO L82 PathProgramCache]: Analyzing trace with hash 1813973276, now seen corresponding path program 3 times [2021-05-06 03:34:21,300 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:34:21,300 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1643356872] [2021-05-06 03:34:21,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:34:21,306 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:34:21,307 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [17255317] [2021-05-06 03:34:21,307 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 [2021-05-06 03:34:21,367 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-06 03:34:21,367 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 03:34:21,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-06 03:34:21,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:34:21,528 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:21,529 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:21,543 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:21,545 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:21,557 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:21,566 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 72 proven. 7 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-06 03:34:21,566 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:34:21,567 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1643356872] [2021-05-06 03:34:21,567 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:34:21,567 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [17255317] [2021-05-06 03:34:21,567 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [17255317] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:34:21,567 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:34:21,567 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-06 03:34:21,567 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [350645766] [2021-05-06 03:34:21,567 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 03:34:21,567 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:34:21,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 03:34:21,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-05-06 03:34:21,568 INFO L87 Difference]: Start difference. First operand 129 states and 155 transitions. Second operand has 10 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 5 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-06 03:34:21,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:34:21,743 INFO L93 Difference]: Finished difference Result 171 states and 212 transitions. [2021-05-06 03:34:21,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 03:34:21,744 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 5 states have call predecessors, (9), 4 states have call successors, (9) Word has length 76 [2021-05-06 03:34:21,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:34:21,745 INFO L225 Difference]: With dead ends: 171 [2021-05-06 03:34:21,745 INFO L226 Difference]: Without dead ends: 158 [2021-05-06 03:34:21,745 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 69.1ms TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-05-06 03:34:21,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2021-05-06 03:34:21,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 153. [2021-05-06 03:34:21,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 99 states have (on average 1.1919191919191918) internal successors, (118), 102 states have internal predecessors, (118), 36 states have call successors, (36), 18 states have call predecessors, (36), 17 states have return successors, (33), 32 states have call predecessors, (33), 33 states have call successors, (33) [2021-05-06 03:34:21,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 187 transitions. [2021-05-06 03:34:21,758 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 187 transitions. Word has length 76 [2021-05-06 03:34:21,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:34:21,758 INFO L480 AbstractCegarLoop]: Abstraction has 153 states and 187 transitions. [2021-05-06 03:34:21,759 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 5 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-06 03:34:21,759 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 187 transitions. [2021-05-06 03:34:21,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-05-06 03:34:21,759 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:34:21,759 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] [2021-05-06 03:34:21,985 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-06 03:34:21,985 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:34:21,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:34:21,985 INFO L82 PathProgramCache]: Analyzing trace with hash 1997631578, now seen corresponding path program 2 times [2021-05-06 03:34:21,986 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:34:21,986 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [342909170] [2021-05-06 03:34:21,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:34:21,993 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:34:21,993 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [113309299] [2021-05-06 03:34:21,993 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 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 [2021-05-06 03:34:22,061 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 03:34:22,061 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 03:34:22,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-06 03:34:22,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:34:22,073 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:22,075 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:22,076 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:22,080 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:22,081 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:22,082 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:22,109 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:22,117 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:22,118 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:22,146 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:22,148 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:22,148 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:22,175 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:22,177 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:22,178 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:22,201 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:22,203 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:22,214 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 22 proven. 200 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-06 03:34:22,214 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:34:22,214 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [342909170] [2021-05-06 03:34:22,214 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:34:22,214 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [113309299] [2021-05-06 03:34:22,214 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [113309299] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:34:22,214 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:34:22,215 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-06 03:34:22,215 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615647834] [2021-05-06 03:34:22,215 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 03:34:22,215 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:34:22,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 03:34:22,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-06 03:34:22,216 INFO L87 Difference]: Start difference. First operand 153 states and 187 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) [2021-05-06 03:34:22,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:34:22,299 INFO L93 Difference]: Finished difference Result 193 states and 227 transitions. [2021-05-06 03:34:22,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 03:34:22,300 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 [2021-05-06 03:34:22,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:34:22,301 INFO L225 Difference]: With dead ends: 193 [2021-05-06 03:34:22,301 INFO L226 Difference]: Without dead ends: 180 [2021-05-06 03:34:22,302 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 28.5ms TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-05-06 03:34:22,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2021-05-06 03:34:22,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 179. [2021-05-06 03:34:22,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 117 states have (on average 1.1538461538461537) internal successors, (135), 120 states have internal predecessors, (135), 39 states have call successors, (39), 23 states have call predecessors, (39), 22 states have return successors, (36), 35 states have call predecessors, (36), 36 states have call successors, (36) [2021-05-06 03:34:22,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 210 transitions. [2021-05-06 03:34:22,315 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 210 transitions. Word has length 80 [2021-05-06 03:34:22,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:34:22,315 INFO L480 AbstractCegarLoop]: Abstraction has 179 states and 210 transitions. [2021-05-06 03:34:22,315 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) [2021-05-06 03:34:22,315 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 210 transitions. [2021-05-06 03:34:22,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-05-06 03:34:22,316 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:34:22,316 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] [2021-05-06 03:34:22,541 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:34:22,541 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:34:22,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:34:22,542 INFO L82 PathProgramCache]: Analyzing trace with hash 1999359456, now seen corresponding path program 2 times [2021-05-06 03:34:22,542 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:34:22,542 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1917516336] [2021-05-06 03:34:22,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:34:22,547 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:34:22,548 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1413354114] [2021-05-06 03:34:22,548 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 [2021-05-06 03:34:22,621 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 03:34:22,621 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 03:34:22,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-06 03:34:22,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:34:22,795 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:22,810 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 22 proven. 21 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-05-06 03:34:22,810 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:34:22,810 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1917516336] [2021-05-06 03:34:22,810 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:34:22,811 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1413354114] [2021-05-06 03:34:22,811 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1413354114] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:34:22,811 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:34:22,811 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-06 03:34:22,811 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1944816273] [2021-05-06 03:34:22,811 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 03:34:22,811 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:34:22,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 03:34:22,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-06 03:34:22,812 INFO L87 Difference]: Start difference. First operand 179 states and 210 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) [2021-05-06 03:34:22,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:34:22,956 INFO L93 Difference]: Finished difference Result 199 states and 230 transitions. [2021-05-06 03:34:22,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 03:34:22,956 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 [2021-05-06 03:34:22,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:34:22,957 INFO L225 Difference]: With dead ends: 199 [2021-05-06 03:34:22,958 INFO L226 Difference]: Without dead ends: 197 [2021-05-06 03:34:22,958 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 49.0ms TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-06 03:34:22,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2021-05-06 03:34:22,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 194. [2021-05-06 03:34:22,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 128 states have (on average 1.1484375) internal successors, (147), 132 states have internal predecessors, (147), 40 states have call successors, (40), 26 states have call predecessors, (40), 25 states have return successors, (37), 35 states have call predecessors, (37), 37 states have call successors, (37) [2021-05-06 03:34:22,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 224 transitions. [2021-05-06 03:34:22,971 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 224 transitions. Word has length 80 [2021-05-06 03:34:22,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:34:22,971 INFO L480 AbstractCegarLoop]: Abstraction has 194 states and 224 transitions. [2021-05-06 03:34:22,971 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) [2021-05-06 03:34:22,971 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 224 transitions. [2021-05-06 03:34:22,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-06 03:34:22,972 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:34:22,972 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 13, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:34:23,188 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:34:23,189 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:34:23,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:34:23,189 INFO L82 PathProgramCache]: Analyzing trace with hash 1432051402, now seen corresponding path program 4 times [2021-05-06 03:34:23,189 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:34:23,189 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2016727380] [2021-05-06 03:34:23,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:34:23,196 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:34:23,196 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1314586905] [2021-05-06 03:34:23,196 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:34:23,260 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 03:34:23,260 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 03:34:23,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-06 03:34:23,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:34:23,270 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:23,271 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:23,272 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:23,278 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:23,279 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:23,279 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:23,318 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:23,320 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:23,321 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:23,344 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:23,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:23,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:23,370 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:23,371 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:23,372 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:23,400 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:23,401 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:23,416 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 72 proven. 260 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2021-05-06 03:34:23,417 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:34:23,417 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2016727380] [2021-05-06 03:34:23,417 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:34:23,417 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1314586905] [2021-05-06 03:34:23,417 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1314586905] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:34:23,417 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:34:23,417 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-06 03:34:23,417 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [986987962] [2021-05-06 03:34:23,418 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 03:34:23,418 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:34:23,418 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 03:34:23,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-06 03:34:23,418 INFO L87 Difference]: Start difference. First operand 194 states and 224 transitions. Second operand has 8 states, 8 states have (on average 4.5) internal successors, (36), 7 states have internal predecessors, (36), 7 states have call successors, (16), 7 states have call predecessors, (16), 6 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) [2021-05-06 03:34:23,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:34:23,512 INFO L93 Difference]: Finished difference Result 241 states and 291 transitions. [2021-05-06 03:34:23,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 03:34:23,512 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.5) internal successors, (36), 7 states have internal predecessors, (36), 7 states have call successors, (16), 7 states have call predecessors, (16), 6 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) Word has length 91 [2021-05-06 03:34:23,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:34:23,513 INFO L225 Difference]: With dead ends: 241 [2021-05-06 03:34:23,514 INFO L226 Difference]: Without dead ends: 196 [2021-05-06 03:34:23,514 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 40.9ms TimeCoverageRelationStatistics Valid=51, Invalid=81, Unknown=0, NotChecked=0, Total=132 [2021-05-06 03:34:23,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-05-06 03:34:23,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2021-05-06 03:34:23,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 130 states have (on average 1.146153846153846) internal successors, (149), 134 states have internal predecessors, (149), 40 states have call successors, (40), 26 states have call predecessors, (40), 25 states have return successors, (37), 35 states have call predecessors, (37), 37 states have call successors, (37) [2021-05-06 03:34:23,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 226 transitions. [2021-05-06 03:34:23,526 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 226 transitions. Word has length 91 [2021-05-06 03:34:23,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:34:23,526 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 226 transitions. [2021-05-06 03:34:23,526 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.5) internal successors, (36), 7 states have internal predecessors, (36), 7 states have call successors, (16), 7 states have call predecessors, (16), 6 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) [2021-05-06 03:34:23,526 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 226 transitions. [2021-05-06 03:34:23,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-05-06 03:34:23,527 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:34:23,527 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:34:23,753 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:34:23,753 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:34:23,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:34:23,753 INFO L82 PathProgramCache]: Analyzing trace with hash -614243194, now seen corresponding path program 3 times [2021-05-06 03:34:23,754 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:34:23,754 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1598712354] [2021-05-06 03:34:23,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:34:23,760 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:34:23,760 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [316269867] [2021-05-06 03:34:23,760 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 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 [2021-05-06 03:34:23,827 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-06 03:34:23,827 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 03:34:23,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 47 conjunts are in the unsatisfiable core [2021-05-06 03:34:23,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:34:24,099 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:24,113 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 60 proven. 60 refuted. 0 times theorem prover too weak. 246 trivial. 0 not checked. [2021-05-06 03:34:24,113 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:34:24,114 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1598712354] [2021-05-06 03:34:24,114 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:34:24,114 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [316269867] [2021-05-06 03:34:24,114 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [316269867] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:34:24,114 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:34:24,114 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-06 03:34:24,114 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1797227688] [2021-05-06 03:34:24,114 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 03:34:24,114 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:34:24,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 03:34:24,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2021-05-06 03:34:24,115 INFO L87 Difference]: Start difference. First operand 196 states and 226 transitions. Second operand has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 11 states have internal predecessors, (31), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 5 states have call predecessors, (14), 6 states have call successors, (14) [2021-05-06 03:34:24,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:34:24,462 INFO L93 Difference]: Finished difference Result 215 states and 247 transitions. [2021-05-06 03:34:24,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 03:34:24,463 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 11 states have internal predecessors, (31), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 5 states have call predecessors, (14), 6 states have call successors, (14) Word has length 94 [2021-05-06 03:34:24,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:34:24,464 INFO L225 Difference]: With dead ends: 215 [2021-05-06 03:34:24,464 INFO L226 Difference]: Without dead ends: 196 [2021-05-06 03:34:24,465 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 81 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 143.8ms TimeCoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2021-05-06 03:34:24,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-05-06 03:34:24,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2021-05-06 03:34:24,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 130 states have (on average 1.1307692307692307) internal successors, (147), 134 states have internal predecessors, (147), 40 states have call successors, (40), 26 states have call predecessors, (40), 25 states have return successors, (36), 35 states have call predecessors, (36), 36 states have call successors, (36) [2021-05-06 03:34:24,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 223 transitions. [2021-05-06 03:34:24,477 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 223 transitions. Word has length 94 [2021-05-06 03:34:24,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:34:24,478 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 223 transitions. [2021-05-06 03:34:24,478 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 11 states have internal predecessors, (31), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 5 states have call predecessors, (14), 6 states have call successors, (14) [2021-05-06 03:34:24,478 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 223 transitions. [2021-05-06 03:34:24,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-05-06 03:34:24,479 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:34:24,479 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:34:24,692 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-05-06 03:34:24,693 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:34:24,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:34:24,693 INFO L82 PathProgramCache]: Analyzing trace with hash -612515316, now seen corresponding path program 3 times [2021-05-06 03:34:24,693 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:34:24,693 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [397925543] [2021-05-06 03:34:24,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:34:24,700 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:34:24,700 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [504916440] [2021-05-06 03:34:24,700 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:34:24,835 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-06 03:34:24,835 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 03:34:24,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 37 conjunts are in the unsatisfiable core [2021-05-06 03:34:24,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:34:25,093 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:25,107 INFO L134 CoverageAnalysis]: Checked inductivity of 368 backedges. 26 proven. 30 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2021-05-06 03:34:25,107 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:34:25,107 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [397925543] [2021-05-06 03:34:25,107 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:34:25,107 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [504916440] [2021-05-06 03:34:25,107 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [504916440] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:34:25,107 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:34:25,107 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-06 03:34:25,108 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1518383836] [2021-05-06 03:34:25,108 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 03:34:25,108 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:34:25,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 03:34:25,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-05-06 03:34:25,111 INFO L87 Difference]: Start difference. First operand 196 states and 223 transitions. Second operand has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-05-06 03:34:25,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:34:25,294 INFO L93 Difference]: Finished difference Result 202 states and 228 transitions. [2021-05-06 03:34:25,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 03:34:25,295 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) Word has length 94 [2021-05-06 03:34:25,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:34:25,296 INFO L225 Difference]: With dead ends: 202 [2021-05-06 03:34:25,296 INFO L226 Difference]: Without dead ends: 179 [2021-05-06 03:34:25,297 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 102.9ms TimeCoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-05-06 03:34:25,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2021-05-06 03:34:25,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 179. [2021-05-06 03:34:25,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 118 states have (on average 1.1355932203389831) internal successors, (134), 121 states have internal predecessors, (134), 37 states have call successors, (37), 24 states have call predecessors, (37), 23 states have return successors, (34), 33 states have call predecessors, (34), 34 states have call successors, (34) [2021-05-06 03:34:25,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 205 transitions. [2021-05-06 03:34:25,308 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 205 transitions. Word has length 94 [2021-05-06 03:34:25,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:34:25,308 INFO L480 AbstractCegarLoop]: Abstraction has 179 states and 205 transitions. [2021-05-06 03:34:25,308 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-05-06 03:34:25,308 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 205 transitions. [2021-05-06 03:34:25,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-05-06 03:34:25,309 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:34:25,309 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:34:25,525 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-06 03:34:25,525 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:34:25,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:34:25,525 INFO L82 PathProgramCache]: Analyzing trace with hash -191541368, now seen corresponding path program 1 times [2021-05-06 03:34:25,526 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:34:25,526 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [103384926] [2021-05-06 03:34:25,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:34:25,532 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:34:25,533 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1569548981] [2021-05-06 03:34:25,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:34:25,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:34:25,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-06 03:34:25,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:34:25,626 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:25,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:25,628 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:25,631 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:25,633 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:25,633 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:25,656 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:25,657 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:25,658 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:25,681 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:25,682 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:25,682 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:25,706 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:25,708 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:25,709 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:25,731 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:25,732 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:25,733 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:25,754 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:25,774 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:25,782 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 26 proven. 296 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-05-06 03:34:25,783 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:34:25,783 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [103384926] [2021-05-06 03:34:25,783 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:34:25,783 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1569548981] [2021-05-06 03:34:25,783 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1569548981] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:34:25,783 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:34:25,783 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-06 03:34:25,783 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [825188170] [2021-05-06 03:34:25,783 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 03:34:25,783 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:34:25,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 03:34:25,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-06 03:34:25,784 INFO L87 Difference]: Start difference. First operand 179 states and 205 transitions. Second operand has 9 states, 9 states have (on average 4.444444444444445) internal successors, (40), 8 states have internal predecessors, (40), 8 states have call successors, (16), 8 states have call predecessors, (16), 6 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) [2021-05-06 03:34:25,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:34:25,885 INFO L93 Difference]: Finished difference Result 224 states and 256 transitions. [2021-05-06 03:34:25,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 03:34:25,886 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.444444444444445) internal successors, (40), 8 states have internal predecessors, (40), 8 states have call successors, (16), 8 states have call predecessors, (16), 6 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) Word has length 94 [2021-05-06 03:34:25,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:34:25,887 INFO L225 Difference]: With dead ends: 224 [2021-05-06 03:34:25,887 INFO L226 Difference]: Without dead ends: 210 [2021-05-06 03:34:25,888 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 32.8ms TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-05-06 03:34:25,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2021-05-06 03:34:25,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 209. [2021-05-06 03:34:25,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 209 states, 139 states have (on average 1.1223021582733812) internal successors, (156), 142 states have internal predecessors, (156), 42 states have call successors, (42), 28 states have call predecessors, (42), 27 states have return successors, (39), 38 states have call predecessors, (39), 39 states have call successors, (39) [2021-05-06 03:34:25,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 237 transitions. [2021-05-06 03:34:25,900 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 237 transitions. Word has length 94 [2021-05-06 03:34:25,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:34:25,900 INFO L480 AbstractCegarLoop]: Abstraction has 209 states and 237 transitions. [2021-05-06 03:34:25,901 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 4.444444444444445) internal successors, (40), 8 states have internal predecessors, (40), 8 states have call successors, (16), 8 states have call predecessors, (16), 6 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) [2021-05-06 03:34:25,901 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 237 transitions. [2021-05-06 03:34:25,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-05-06 03:34:25,902 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:34:25,902 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:34:26,118 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-06 03:34:26,118 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:34:26,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:34:26,119 INFO L82 PathProgramCache]: Analyzing trace with hash -189813490, now seen corresponding path program 1 times [2021-05-06 03:34:26,119 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:34:26,119 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2068848417] [2021-05-06 03:34:26,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:34:26,139 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:34:26,139 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1869382543] [2021-05-06 03:34:26,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:34:26,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:34:26,190 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-06 03:34:26,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:34:26,203 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:26,211 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:26,212 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:26,218 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:26,219 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:26,226 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:26,227 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:26,234 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:26,236 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:26,244 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:26,245 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:26,246 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:26,246 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:26,253 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:26,255 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:26,256 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:26,256 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:26,263 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:26,264 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:26,265 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:26,265 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:26,294 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:26,304 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:26,331 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:26,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:26,354 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:26,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:26,380 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:26,383 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:26,394 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:26,396 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:26,410 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:26,413 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:26,445 INFO L134 CoverageAnalysis]: Checked inductivity of 368 backedges. 137 proven. 0 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2021-05-06 03:34:26,445 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:34:26,445 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2068848417] [2021-05-06 03:34:26,445 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:34:26,445 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1869382543] [2021-05-06 03:34:26,445 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1869382543] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 03:34:26,445 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 03:34:26,445 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 03:34:26,446 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429993151] [2021-05-06 03:34:26,446 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 03:34:26,446 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:34:26,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 03:34:26,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 03:34:26,446 INFO L87 Difference]: Start difference. First operand 209 states and 237 transitions. Second operand has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 6 states have internal predecessors, (28), 5 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-05-06 03:34:26,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:34:26,536 INFO L93 Difference]: Finished difference Result 243 states and 282 transitions. [2021-05-06 03:34:26,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 03:34:26,537 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 6 states have internal predecessors, (28), 5 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) Word has length 94 [2021-05-06 03:34:26,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:34:26,538 INFO L225 Difference]: With dead ends: 243 [2021-05-06 03:34:26,538 INFO L226 Difference]: Without dead ends: 169 [2021-05-06 03:34:26,539 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 33.5ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-06 03:34:26,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-05-06 03:34:26,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 158. [2021-05-06 03:34:26,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 104 states have (on average 1.0961538461538463) internal successors, (114), 106 states have internal predecessors, (114), 31 states have call successors, (31), 23 states have call predecessors, (31), 22 states have return successors, (29), 28 states have call predecessors, (29), 29 states have call successors, (29) [2021-05-06 03:34:26,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 174 transitions. [2021-05-06 03:34:26,550 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 174 transitions. Word has length 94 [2021-05-06 03:34:26,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:34:26,550 INFO L480 AbstractCegarLoop]: Abstraction has 158 states and 174 transitions. [2021-05-06 03:34:26,550 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 6 states have internal predecessors, (28), 5 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-05-06 03:34:26,550 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 174 transitions. [2021-05-06 03:34:26,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-05-06 03:34:26,551 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:34:26,551 INFO L523 BasicCegarLoop]: trace histogram [15, 14, 14, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:34:26,764 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-05-06 03:34:26,765 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:34:26,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:34:26,765 INFO L82 PathProgramCache]: Analyzing trace with hash 412069254, now seen corresponding path program 4 times [2021-05-06 03:34:26,765 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:34:26,765 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [618469111] [2021-05-06 03:34:26,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:34:26,771 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:34:26,772 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [789998191] [2021-05-06 03:34:26,772 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:34:26,847 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 03:34:26,848 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 03:34:26,849 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 45 conjunts are in the unsatisfiable core [2021-05-06 03:34:26,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:34:35,447 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:35,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:35,489 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:35,492 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:43,039 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:34:43,050 WARN L159 QuantifierPusher]: Ignoring assumption.