/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/nla-digbench/ps5-ll.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 07:07:57,613 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 07:07:57,615 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 07:07:57,645 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-06 07:07:57,646 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-06 07:07:57,648 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-06 07:07:57,650 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-06 07:07:57,654 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-06 07:07:57,656 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-06 07:07:57,659 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-06 07:07:57,659 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-06 07:07:57,660 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2021-05-06 07:07:57,694 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 07:07:57,695 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 07:07:57,695 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 07:07:57,696 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-06 07:07:57,708 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 07:07:57,709 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 07:07:57,710 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 07:07:57,711 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 07:07:57,711 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 07:07:57,711 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 07:07:57,711 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 07:07:57,711 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 07:07:57,711 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 07:07:57,711 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 07:07:57,712 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 07:07:57,712 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 07:07:57,712 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 07:07:57,712 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 07:07:57,713 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 07:07:57,713 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 07:07:57,713 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 07:07:57,713 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 07:07:57,713 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 07:07:57,713 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 07:07:57,713 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 07:07:57,714 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-06 07:07:57,714 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 07:07:57,937 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 07:07:57,948 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 07:07:57,950 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 07:07:57,951 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 07:07:57,951 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 07:07:57,951 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/ps5-ll.c [2021-05-06 07:07:58,004 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6630e779e/58d73e98bdbd47c697e876813fe3356a/FLAG02a858f7d [2021-05-06 07:07:58,384 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 07:07:58,384 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/ps5-ll.c [2021-05-06 07:07:58,388 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6630e779e/58d73e98bdbd47c697e876813fe3356a/FLAG02a858f7d [2021-05-06 07:07:58,402 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6630e779e/58d73e98bdbd47c697e876813fe3356a [2021-05-06 07:07:58,404 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 07:07:58,405 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-06 07:07:58,409 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 07:07:58,409 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 07:07:58,411 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 07:07:58,412 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 07:07:58" (1/1) ... [2021-05-06 07:07:58,413 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5e0fd935 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:07:58, skipping insertion in model container [2021-05-06 07:07:58,413 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 07:07:58" (1/1) ... [2021-05-06 07:07:58,417 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 07:07:58,428 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 07:07:58,541 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/ps5-ll.c[458,471] [2021-05-06 07:07:58,556 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 07:07:58,561 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 07:07:58,603 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/ps5-ll.c[458,471] [2021-05-06 07:07:58,612 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 07:07:58,621 INFO L208 MainTranslator]: Completed translation [2021-05-06 07:07:58,622 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:07:58 WrapperNode [2021-05-06 07:07:58,622 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 07:07:58,623 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 07:07:58,623 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 07:07:58,623 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 07:07:58,631 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:07:58" (1/1) ... [2021-05-06 07:07:58,631 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:07:58" (1/1) ... [2021-05-06 07:07:58,637 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:07:58" (1/1) ... [2021-05-06 07:07:58,637 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:07:58" (1/1) ... [2021-05-06 07:07:58,645 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:07:58" (1/1) ... [2021-05-06 07:07:58,648 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:07:58" (1/1) ... [2021-05-06 07:07:58,650 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:07:58" (1/1) ... [2021-05-06 07:07:58,654 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 07:07:58,655 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 07:07:58,655 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 07:07:58,656 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 07:07:58,656 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:07:58" (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 07:07:58,700 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 07:07:58,700 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 07:07:58,700 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 07:07:58,700 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 07:07:58,700 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 07:07:58,700 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 07:07:58,701 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 07:07:58,701 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 07:07:58,701 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 07:07:58,701 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 07:07:58,701 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2021-05-06 07:07:58,701 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 07:07:58,701 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 07:07:58,701 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 07:07:58,702 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 07:07:58,702 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 07:07:58,702 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 07:07:58,702 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 07:07:58,703 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 07:07:58,703 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 07:07:58,839 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 07:07:58,839 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-06 07:07:58,840 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 07:07:58 BoogieIcfgContainer [2021-05-06 07:07:58,840 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 07:07:58,841 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-06 07:07:58,841 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-06 07:07:58,843 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-06 07:07:58,845 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 07:07:58" (1/1) ... [2021-05-06 07:07:58,854 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 07:07:58 BasicIcfg [2021-05-06 07:07:58,854 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-06 07:07:58,855 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 07:07:58,855 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 07:07:58,858 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 07:07:58,858 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 07:07:58" (1/4) ... [2021-05-06 07:07:58,859 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7fb48d64 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 07:07:58, skipping insertion in model container [2021-05-06 07:07:58,859 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:07:58" (2/4) ... [2021-05-06 07:07:58,859 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7fb48d64 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 07:07:58, skipping insertion in model container [2021-05-06 07:07:58,859 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 07:07:58" (3/4) ... [2021-05-06 07:07:58,860 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7fb48d64 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 07:07:58, skipping insertion in model container [2021-05-06 07:07:58,861 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 07:07:58" (4/4) ... [2021-05-06 07:07:58,861 INFO L111 eAbstractionObserver]: Analyzing ICFG ps5-ll.cJordan [2021-05-06 07:07:58,865 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-06 07:07:58,868 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 07:07:58,879 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 07:07:58,899 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 07:07:58,899 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-06 07:07:58,899 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-06 07:07:58,899 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 07:07:58,899 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 07:07:58,899 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 07:07:58,899 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 07:07:58,900 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 07:07:58,910 INFO L276 IsEmpty]: Start isEmpty. Operand has 28 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 07:07:58,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 07:07:58,915 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:07:58,916 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:07:58,916 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:07:58,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:07:58,920 INFO L82 PathProgramCache]: Analyzing trace with hash -1885409022, now seen corresponding path program 1 times [2021-05-06 07:07:58,926 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:07:58,926 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1603405979] [2021-05-06 07:07:58,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:07:59,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:07:59,115 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 07:07:59,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:07:59,138 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 07:07:59,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:07:59,143 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 07:07:59,143 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:07:59,143 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1603405979] [2021-05-06 07:07:59,144 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1603405979] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 07:07:59,144 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 07:07:59,144 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 07:07:59,145 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1786287374] [2021-05-06 07:07:59,147 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 07:07:59,147 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:07:59,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 07:07:59,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 07:07:59,157 INFO L87 Difference]: Start difference. First operand has 28 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 07:07:59,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:07:59,218 INFO L93 Difference]: Finished difference Result 28 states and 30 transitions. [2021-05-06 07:07:59,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 07:07:59,221 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2021-05-06 07:07:59,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:07:59,225 INFO L225 Difference]: With dead ends: 28 [2021-05-06 07:07:59,225 INFO L226 Difference]: Without dead ends: 23 [2021-05-06 07:07:59,226 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 60.4ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 07:07:59,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-06 07:07:59,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-05-06 07:07:59,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 14 states have internal predecessors, (15), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 07:07:59,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2021-05-06 07:07:59,250 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 17 [2021-05-06 07:07:59,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:07:59,250 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2021-05-06 07:07:59,251 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 07:07:59,251 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2021-05-06 07:07:59,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 07:07:59,251 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:07:59,251 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:07:59,252 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 07:07:59,252 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:07:59,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:07:59,253 INFO L82 PathProgramCache]: Analyzing trace with hash 603980644, now seen corresponding path program 1 times [2021-05-06 07:07:59,253 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:07:59,253 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1461144252] [2021-05-06 07:07:59,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:07:59,276 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:07:59,276 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2018325407] [2021-05-06 07:07:59,276 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 07:07:59,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:07:59,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 07:07:59,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:07:59,420 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:59,444 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 07:07:59,444 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:07:59,445 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1461144252] [2021-05-06 07:07:59,445 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:07:59,445 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2018325407] [2021-05-06 07:07:59,445 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2018325407] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 07:07:59,445 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 07:07:59,445 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 07:07:59,445 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958032074] [2021-05-06 07:07:59,446 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 07:07:59,446 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:07:59,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 07:07:59,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 07:07:59,447 INFO L87 Difference]: Start difference. First operand 23 states and 25 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 07:07:59,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:07:59,486 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2021-05-06 07:07:59,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 07:07:59,487 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2021-05-06 07:07:59,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:07:59,488 INFO L225 Difference]: With dead ends: 32 [2021-05-06 07:07:59,488 INFO L226 Difference]: Without dead ends: 30 [2021-05-06 07:07:59,488 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 12.8ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 07:07:59,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-06 07:07:59,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-05-06 07:07:59,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 19 states have internal predecessors, (20), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 07:07:59,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2021-05-06 07:07:59,502 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 17 [2021-05-06 07:07:59,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:07:59,502 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2021-05-06 07:07:59,502 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 07:07:59,502 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2021-05-06 07:07:59,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-06 07:07:59,502 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:07:59,503 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:07:59,708 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-06 07:07:59,709 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:07:59,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:07:59,709 INFO L82 PathProgramCache]: Analyzing trace with hash -169450186, now seen corresponding path program 1 times [2021-05-06 07:07:59,710 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:07:59,710 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2064487750] [2021-05-06 07:07:59,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:07:59,718 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:07:59,718 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [139915722] [2021-05-06 07:07:59,718 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 07:07:59,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:07:59,766 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 07:07:59,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:07:59,832 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:07:59,840 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 07:07:59,840 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:07:59,840 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2064487750] [2021-05-06 07:07:59,840 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:07:59,840 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [139915722] [2021-05-06 07:07:59,841 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [139915722] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 07:07:59,841 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 07:07:59,841 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 07:07:59,841 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1052261354] [2021-05-06 07:07:59,841 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 07:07:59,841 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:07:59,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 07:07:59,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 07:07:59,842 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 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 07:07:59,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:07:59,900 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2021-05-06 07:07:59,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 07:07:59,900 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 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 24 [2021-05-06 07:07:59,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:07:59,901 INFO L225 Difference]: With dead ends: 39 [2021-05-06 07:07:59,901 INFO L226 Difference]: Without dead ends: 39 [2021-05-06 07:07:59,901 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 22.5ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-06 07:07:59,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-06 07:07:59,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2021-05-06 07:07:59,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 25 states have internal predecessors, (26), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 07:07:59,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2021-05-06 07:07:59,905 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 24 [2021-05-06 07:07:59,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:07:59,905 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2021-05-06 07:07:59,905 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 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 07:07:59,905 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2021-05-06 07:07:59,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-06 07:07:59,906 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:07:59,906 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:08:00,117 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:08:00,117 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:08:00,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:08:00,118 INFO L82 PathProgramCache]: Analyzing trace with hash -570969308, now seen corresponding path program 2 times [2021-05-06 07:08:00,118 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:08:00,118 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1603325370] [2021-05-06 07:08:00,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:08:00,126 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:08:00,126 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1602234404] [2021-05-06 07:08:00,126 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 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 07:08:00,236 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 07:08:00,236 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 07:08:00,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-06 07:08:00,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:08:00,336 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:08:00,349 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 07:08:00,349 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:08:00,349 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1603325370] [2021-05-06 07:08:00,349 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:08:00,349 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1602234404] [2021-05-06 07:08:00,349 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1602234404] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 07:08:00,350 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 07:08:00,350 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-06 07:08:00,350 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1742415195] [2021-05-06 07:08:00,350 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 07:08:00,350 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:08:00,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 07:08:00,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-06 07:08:00,351 INFO L87 Difference]: Start difference. First operand 38 states and 42 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-06 07:08:00,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:08:00,448 INFO L93 Difference]: Finished difference Result 48 states and 54 transitions. [2021-05-06 07:08:00,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 07:08:00,448 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 31 [2021-05-06 07:08:00,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:08:00,451 INFO L225 Difference]: With dead ends: 48 [2021-05-06 07:08:00,451 INFO L226 Difference]: Without dead ends: 48 [2021-05-06 07:08:00,452 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 51.6ms TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-05-06 07:08:00,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-06 07:08:00,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2021-05-06 07:08:00,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 31 states have internal predecessors, (32), 11 states have call successors, (11), 7 states have call predecessors, (11), 6 states have return successors, (9), 7 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 07:08:00,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 52 transitions. [2021-05-06 07:08:00,469 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 52 transitions. Word has length 31 [2021-05-06 07:08:00,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:08:00,469 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 52 transitions. [2021-05-06 07:08:00,469 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-06 07:08:00,469 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 52 transitions. [2021-05-06 07:08:00,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-06 07:08:00,470 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:08:00,470 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 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 07:08:00,670 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:08:00,672 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:08:00,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:08:00,672 INFO L82 PathProgramCache]: Analyzing trace with hash -124222480, now seen corresponding path program 1 times [2021-05-06 07:08:00,672 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:08:00,673 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1915539940] [2021-05-06 07:08:00,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:08:00,680 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:08:00,680 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1243893614] [2021-05-06 07:08:00,680 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 07:08:00,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:08:00,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-06 07:08:00,728 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:08:00,790 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:08:00,791 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:08:00,793 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:08:00,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:08:00,811 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:08:00,822 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:08:00,824 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:08:00,841 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:08:00,843 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:08:00,858 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:08:00,870 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:08:00,881 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-06 07:08:00,881 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:08:00,881 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1915539940] [2021-05-06 07:08:00,881 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:08:00,881 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1243893614] [2021-05-06 07:08:00,881 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1243893614] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 07:08:00,881 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 07:08:00,881 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 07:08:00,882 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [863097112] [2021-05-06 07:08:00,882 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 07:08:00,882 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:08:00,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 07:08:00,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-06 07:08:00,882 INFO L87 Difference]: Start difference. First operand 46 states and 52 transitions. Second operand has 7 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-06 07:08:00,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:08:00,943 INFO L93 Difference]: Finished difference Result 51 states and 56 transitions. [2021-05-06 07:08:00,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 07:08:00,944 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 35 [2021-05-06 07:08:00,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:08:00,945 INFO L225 Difference]: With dead ends: 51 [2021-05-06 07:08:00,945 INFO L226 Difference]: Without dead ends: 45 [2021-05-06 07:08:00,945 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 46.2ms TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-05-06 07:08:00,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-06 07:08:00,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-05-06 07:08:00,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 30 states have internal predecessors, (31), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 07:08:00,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2021-05-06 07:08:00,949 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 35 [2021-05-06 07:08:00,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:08:00,949 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2021-05-06 07:08:00,949 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-06 07:08:00,949 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2021-05-06 07:08:00,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-06 07:08:00,950 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:08:00,950 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:08:01,156 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:08:01,157 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:08:01,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:08:01,157 INFO L82 PathProgramCache]: Analyzing trace with hash 1050508662, now seen corresponding path program 3 times [2021-05-06 07:08:01,158 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:08:01,158 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [887195461] [2021-05-06 07:08:01,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:08:01,165 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:08:01,165 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [883801880] [2021-05-06 07:08:01,165 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 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