/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/ps6-ll_unwindbound100.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 04:59:28,576 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 04:59:28,578 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 04:59:28,607 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 04:59:28,621 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 04:59:28,623 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 04:59:28,624 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 04:59:28,625 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 04:59:28,627 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 04:59:28,627 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 04:59:28,641 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 04:59:28,642 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 04:59:28,643 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 04:59:28,644 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 04:59:28,645 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 04:59:28,645 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 04:59:28,647 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 04:59:28,651 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 04:59:28,652 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 04:59:28,652 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 04:59:28,665 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 04:59:28,679 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 04:59:28,679 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 04:59:28,680 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-06 04:59:28,680 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-06 04:59:28,680 INFO L138 SettingsManager]: * Use SBE=true [2021-05-06 04:59:28,681 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 04:59:28,681 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 04:59:28,681 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 04:59:28,681 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 04:59:28,681 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 04:59:28,681 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 04:59:28,681 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 04:59:28,681 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 04:59:28,681 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 04:59:28,682 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 04:59:28,682 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 04:59:28,682 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 04:59:28,682 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 04:59:28,682 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 04:59:28,682 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 04:59:28,682 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 04:59:28,682 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 04:59:28,683 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-06 04:59:28,683 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-06 04:59:28,683 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 04:59:28,683 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-06 04:59:28,683 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 04:59:28,683 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-06 04:59:28,683 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 04:59:28,925 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 04:59:28,937 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 04:59:28,939 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 04:59:28,940 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 04:59:28,940 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 04:59:28,941 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/ps6-ll_unwindbound100.c [2021-05-06 04:59:28,977 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/050edeb27/e9c8286e3906489f915a0a82008af1ea/FLAG83202fa1f [2021-05-06 04:59:29,389 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 04:59:29,389 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/ps6-ll_unwindbound100.c [2021-05-06 04:59:29,394 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/050edeb27/e9c8286e3906489f915a0a82008af1ea/FLAG83202fa1f [2021-05-06 04:59:29,405 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/050edeb27/e9c8286e3906489f915a0a82008af1ea [2021-05-06 04:59:29,407 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 04:59:29,409 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 04:59:29,411 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 04:59:29,411 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 04:59:29,414 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 04:59:29,414 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 04:59:29" (1/1) ... [2021-05-06 04:59:29,415 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@772a1028 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:59:29, skipping insertion in model container [2021-05-06 04:59:29,415 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 04:59:29" (1/1) ... [2021-05-06 04:59:29,419 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 04:59:29,428 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 04:59:29,533 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/ps6-ll_unwindbound100.c[458,471] [2021-05-06 04:59:29,557 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 04:59:29,562 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 04:59:29,573 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/ps6-ll_unwindbound100.c[458,471] [2021-05-06 04:59:29,609 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 04:59:29,629 INFO L208 MainTranslator]: Completed translation [2021-05-06 04:59:29,630 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:59:29 WrapperNode [2021-05-06 04:59:29,630 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 04:59:29,632 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 04:59:29,632 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 04:59:29,633 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 04:59:29,639 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:59:29" (1/1) ... [2021-05-06 04:59:29,640 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:59:29" (1/1) ... [2021-05-06 04:59:29,645 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:59:29" (1/1) ... [2021-05-06 04:59:29,645 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:59:29" (1/1) ... [2021-05-06 04:59:29,653 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:59:29" (1/1) ... [2021-05-06 04:59:29,657 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:59:29" (1/1) ... [2021-05-06 04:59:29,660 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:59:29" (1/1) ... [2021-05-06 04:59:29,663 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 04:59:29,664 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 04:59:29,665 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 04:59:29,665 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 04:59:29,665 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:59:29" (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 04:59:29,741 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 04:59:29,741 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 04:59:29,741 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 04:59:29,742 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 04:59:29,742 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 04:59:29,742 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 04:59:29,742 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 04:59:29,742 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 04:59:29,742 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 04:59:29,742 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 04:59:29,742 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2021-05-06 04:59:29,742 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 04:59:29,742 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 04:59:29,742 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 04:59:29,742 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 04:59:29,742 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 04:59:29,742 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 04:59:29,743 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 04:59:29,743 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 04:59:29,743 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 04:59:29,963 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 04:59:29,964 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-06 04:59:29,964 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 04:59:29 BoogieIcfgContainer [2021-05-06 04:59:29,964 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 04:59:29,965 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 04:59:29,966 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 04:59:29,967 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 04:59:29,967 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 04:59:29" (1/3) ... [2021-05-06 04:59:29,968 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@72100614 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 04:59:29, skipping insertion in model container [2021-05-06 04:59:29,968 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:59:29" (2/3) ... [2021-05-06 04:59:29,968 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@72100614 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 04:59:29, skipping insertion in model container [2021-05-06 04:59:29,968 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 04:59:29" (3/3) ... [2021-05-06 04:59:29,969 INFO L111 eAbstractionObserver]: Analyzing ICFG ps6-ll_unwindbound100.c [2021-05-06 04:59:29,972 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-06 04:59:29,975 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 04:59:29,985 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 04:59:30,000 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 04:59:30,001 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 04:59:30,001 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-06 04:59:30,001 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 04:59:30,001 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 04:59:30,001 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 04:59:30,001 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 04:59:30,001 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 04:59:30,010 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 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 04:59:30,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 04:59:30,013 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:59:30,014 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 04:59:30,014 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:59:30,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:59:30,017 INFO L82 PathProgramCache]: Analyzing trace with hash 21872251, now seen corresponding path program 1 times [2021-05-06 04:59:30,022 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:59:30,022 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1296533589] [2021-05-06 04:59:30,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:59:30,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:59:30,139 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 04:59:30,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:59:30,152 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 04:59:30,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:59:30,170 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 04:59:30,170 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:59:30,171 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1296533589] [2021-05-06 04:59:30,171 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1296533589] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 04:59:30,171 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 04:59:30,171 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 04:59:30,172 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1728080184] [2021-05-06 04:59:30,174 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 04:59:30,175 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:59:30,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 04:59:30,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 04:59:30,184 INFO L87 Difference]: Start difference. First operand has 29 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 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 04:59:30,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:59:30,260 INFO L93 Difference]: Finished difference Result 50 states and 65 transitions. [2021-05-06 04:59:30,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 04:59:30,261 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 04:59:30,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:59:30,265 INFO L225 Difference]: With dead ends: 50 [2021-05-06 04:59:30,265 INFO L226 Difference]: Without dead ends: 25 [2021-05-06 04:59:30,267 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 26.5ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 04:59:30,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-06 04:59:30,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2021-05-06 04:59:30,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 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 04:59:30,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2021-05-06 04:59:30,290 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 17 [2021-05-06 04:59:30,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:59:30,290 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2021-05-06 04:59:30,290 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 04:59:30,290 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2021-05-06 04:59:30,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-06 04:59:30,291 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:59:30,291 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:59:30,291 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 04:59:30,291 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:59:30,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:59:30,292 INFO L82 PathProgramCache]: Analyzing trace with hash -119968982, now seen corresponding path program 1 times [2021-05-06 04:59:30,292 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:59:30,292 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [902836024] [2021-05-06 04:59:30,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:59:30,306 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:59:30,306 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [839681182] [2021-05-06 04:59:30,306 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 04:59:30,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:59:30,356 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-06 04:59:30,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:59:30,386 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:30,390 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:30,391 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:30,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:30,414 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:30,426 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 04:59:30,426 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:59:30,426 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [902836024] [2021-05-06 04:59:30,426 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:59:30,426 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [839681182] [2021-05-06 04:59:30,427 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [839681182] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 04:59:30,427 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 04:59:30,427 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 04:59:30,427 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1639748255] [2021-05-06 04:59:30,427 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 04:59:30,427 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:59:30,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 04:59:30,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 04:59:30,428 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 04:59:30,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:59:30,437 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2021-05-06 04:59:30,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 04:59:30,438 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 18 [2021-05-06 04:59:30,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:59:30,438 INFO L225 Difference]: With dead ends: 34 [2021-05-06 04:59:30,438 INFO L226 Difference]: Without dead ends: 26 [2021-05-06 04:59:30,439 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.8ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 04:59:30,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-06 04:59:30,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-05-06 04:59:30,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 16 states have (on average 1.1875) internal successors, (19), 17 states have internal predecessors, (19), 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 04:59:30,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2021-05-06 04:59:30,443 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 18 [2021-05-06 04:59:30,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:59:30,443 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2021-05-06 04:59:30,443 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 04:59:30,443 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2021-05-06 04:59:30,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-06 04:59:30,443 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:59:30,444 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:59:30,660 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-06 04:59:30,660 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:59:30,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:59:30,661 INFO L82 PathProgramCache]: Analyzing trace with hash -118181522, now seen corresponding path program 1 times [2021-05-06 04:59:30,661 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:59:30,661 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [120160684] [2021-05-06 04:59:30,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:59:30,683 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:59:30,684 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [321794842] [2021-05-06 04:59:30,684 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 04:59:30,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:59:30,747 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 04:59:30,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:59:30,804 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:30,816 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 04:59:30,817 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:59:30,817 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [120160684] [2021-05-06 04:59:30,817 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:59:30,817 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [321794842] [2021-05-06 04:59:30,817 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [321794842] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 04:59:30,817 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 04:59:30,817 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 04:59:30,817 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1874165632] [2021-05-06 04:59:30,818 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 04:59:30,818 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:59:30,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 04:59:30,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 04:59:30,818 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 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 04:59:30,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:59:30,973 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2021-05-06 04:59:30,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 04:59:30,974 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 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 18 [2021-05-06 04:59:30,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:59:30,974 INFO L225 Difference]: With dead ends: 36 [2021-05-06 04:59:30,974 INFO L226 Difference]: Without dead ends: 32 [2021-05-06 04:59:30,975 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 16.8ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 04:59:30,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-06 04:59:30,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-06 04:59:30,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 20 states have (on average 1.15) internal successors, (23), 21 states have internal predecessors, (23), 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 04:59:30,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2021-05-06 04:59:30,980 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 18 [2021-05-06 04:59:30,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:59:30,980 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2021-05-06 04:59:30,980 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 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 04:59:30,981 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2021-05-06 04:59:30,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-06 04:59:30,981 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:59:30,981 INFO L523 BasicCegarLoop]: trace histogram [2, 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 04:59:31,196 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:59:31,199 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:59:31,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:59:31,200 INFO L82 PathProgramCache]: Analyzing trace with hash -1364840471, now seen corresponding path program 1 times [2021-05-06 04:59:31,200 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:59:31,200 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1030372300] [2021-05-06 04:59:31,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:59:31,209 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:59:31,209 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1960420167] [2021-05-06 04:59:31,209 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 04:59:31,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:59:31,259 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 04:59:31,261 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:59:31,271 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:31,297 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:31,299 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:31,323 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:31,326 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:31,327 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:31,352 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:31,365 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:31,375 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 04:59:31,375 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:59:31,375 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1030372300] [2021-05-06 04:59:31,375 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:59:31,375 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1960420167] [2021-05-06 04:59:31,376 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1960420167] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:59:31,376 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:59:31,376 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-06 04:59:31,376 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1437388450] [2021-05-06 04:59:31,376 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 04:59:31,376 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:59:31,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 04:59:31,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 04:59:31,389 INFO L87 Difference]: Start difference. First operand 32 states and 35 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, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 04:59:31,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:59:31,429 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2021-05-06 04:59:31,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 04:59:31,429 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, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 26 [2021-05-06 04:59:31,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:59:31,430 INFO L225 Difference]: With dead ends: 42 [2021-05-06 04:59:31,430 INFO L226 Difference]: Without dead ends: 34 [2021-05-06 04:59:31,430 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 21.9ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 04:59:31,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-06 04:59:31,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-06 04:59:31,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 23 states have internal predecessors, (25), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 04:59:31,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2021-05-06 04:59:31,435 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 26 [2021-05-06 04:59:31,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:59:31,436 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2021-05-06 04:59:31,436 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, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 04:59:31,436 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2021-05-06 04:59:31,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-06 04:59:31,441 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:59:31,441 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:59:31,641 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:59:31,642 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:59:31,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:59:31,642 INFO L82 PathProgramCache]: Analyzing trace with hash -1363053011, now seen corresponding path program 1 times [2021-05-06 04:59:31,642 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:59:31,642 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [378564716] [2021-05-06 04:59:31,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:59:31,650 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:59:31,650 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2136016181] [2021-05-06 04:59:31,650 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 04:59:31,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:59:31,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 04:59:31,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:59:31,813 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:31,821 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 04:59:31,822 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:59:31,822 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [378564716] [2021-05-06 04:59:31,822 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:59:31,822 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2136016181] [2021-05-06 04:59:31,822 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2136016181] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:59:31,822 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:59:31,822 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 04:59:31,823 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [385537890] [2021-05-06 04:59:31,823 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 04:59:31,826 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:59:31,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 04:59:31,827 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 04:59:31,827 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 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 04:59:31,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:59:31,876 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2021-05-06 04:59:31,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 04:59:31,877 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 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 26 [2021-05-06 04:59:31,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:59:31,879 INFO L225 Difference]: With dead ends: 44 [2021-05-06 04:59:31,879 INFO L226 Difference]: Without dead ends: 42 [2021-05-06 04:59:31,881 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 21.0ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-06 04:59:31,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-06 04:59:31,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2021-05-06 04:59:31,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 26 states have (on average 1.1538461538461537) internal successors, (30), 28 states have internal predecessors, (30), 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 04:59:31,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 46 transitions. [2021-05-06 04:59:31,899 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 46 transitions. Word has length 26 [2021-05-06 04:59:31,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:59:31,899 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 46 transitions. [2021-05-06 04:59:31,899 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 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 04:59:31,899 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 46 transitions. [2021-05-06 04:59:31,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-06 04:59:31,901 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:59:31,901 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:59:32,117 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:59:32,117 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:59:32,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:59:32,120 INFO L82 PathProgramCache]: Analyzing trace with hash -595737176, now seen corresponding path program 2 times [2021-05-06 04:59:32,121 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:59:32,121 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [334350271] [2021-05-06 04:59:32,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:59:32,128 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:59:32,128 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [882325536] [2021-05-06 04:59:32,128 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:59:32,175 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 04:59:32,175 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 04:59:32,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 04:59:32,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:59:32,185 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:32,187 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:32,188 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:32,199 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:32,201 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:32,201 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:32,215 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:32,217 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:32,217 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:32,231 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:32,233 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:59:32,242 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 04:59:32,242 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:59:32,242 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [334350271] [2021-05-06 04:59:32,242 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:59:32,242 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [882325536] [2021-05-06 04:59:32,242 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [882325536] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:59:32,242 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:59:32,242 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 04:59:32,243 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1130722572] [2021-05-06 04:59:32,243 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 04:59:32,243 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:59:32,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 04:59:32,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 04:59:32,243 INFO L87 Difference]: Start difference. First operand 41 states and 46 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, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 05:02:31,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:02:31,575 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2021-05-06 05:02:31,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 05:02:31,576 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, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) Word has length 34 [2021-05-06 05:02:31,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:02:31,576 INFO L225 Difference]: With dead ends: 58 [2021-05-06 05:02:31,576 INFO L226 Difference]: Without dead ends: 48 [2021-05-06 05:02:31,577 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 18.7ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-06 05:02:31,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-06 05:02:31,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2021-05-06 05:02:31,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 31 states have internal predecessors, (34), 10 states have call successors, (10), 7 states have call predecessors, (10), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 05:02:31,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2021-05-06 05:02:31,581 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 34 [2021-05-06 05:02:31,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:02:31,582 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2021-05-06 05:02:31,582 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, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 05:02:31,582 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2021-05-06 05:02:31,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-06 05:02:31,582 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:02:31,582 INFO L523 BasicCegarLoop]: trace histogram [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 05:02:31,800 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-06 05:02:31,800 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:02:31,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:02:31,800 INFO L82 PathProgramCache]: Analyzing trace with hash -593949716, now seen corresponding path program 2 times [2021-05-06 05:02:31,801 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:02:31,801 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1282304224] [2021-05-06 05:02:31,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:02:31,807 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:02:31,807 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1935444463] [2021-05-06 05:02:31,808 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 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 05:02:31,913 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 05:02:31,913 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:02:31,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-06 05:02:31,916 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:02:31,999 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:32,007 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 05:02:32,007 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:02:32,007 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1282304224] [2021-05-06 05:02:32,008 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:02:32,008 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1935444463] [2021-05-06 05:02:32,008 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1935444463] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:02:32,008 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:02:32,008 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 05:02:32,008 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1446910572] [2021-05-06 05:02:32,008 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 05:02:32,008 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:02:32,009 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 05:02:32,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-06 05:02:32,009 INFO L87 Difference]: Start difference. First operand 46 states and 51 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, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-06 05:02:32,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:02:32,066 INFO L93 Difference]: Finished difference Result 56 states and 63 transitions. [2021-05-06 05:02:32,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 05:02:32,066 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, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 34 [2021-05-06 05:02:32,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:02:32,067 INFO L225 Difference]: With dead ends: 56 [2021-05-06 05:02:32,067 INFO L226 Difference]: Without dead ends: 54 [2021-05-06 05:02:32,067 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 28.1ms TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-06 05:02:32,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-06 05:02:32,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2021-05-06 05:02:32,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 36 states have internal predecessors, (39), 12 states have call successors, (12), 8 states have call predecessors, (12), 6 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 05:02:32,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 60 transitions. [2021-05-06 05:02:32,073 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 60 transitions. Word has length 34 [2021-05-06 05:02:32,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:02:32,073 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 60 transitions. [2021-05-06 05:02:32,073 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, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-06 05:02:32,073 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 60 transitions. [2021-05-06 05:02:32,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-06 05:02:32,074 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:02:32,074 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 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 05:02:32,281 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:02:32,281 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:02:32,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:02:32,281 INFO L82 PathProgramCache]: Analyzing trace with hash -1559147673, now seen corresponding path program 1 times [2021-05-06 05:02:32,281 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:02:32,281 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1965696106] [2021-05-06 05:02:32,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:02:32,294 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:02:32,294 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [730581209] [2021-05-06 05:02:32,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:02:32,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:02:32,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-06 05:02:32,337 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:02:32,374 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:32,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:32,376 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:32,376 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:32,384 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:32,394 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:32,395 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:32,404 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:32,405 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:32,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:32,420 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:32,428 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-06 05:02:32,428 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:02:32,428 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1965696106] [2021-05-06 05:02:32,429 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:02:32,429 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [730581209] [2021-05-06 05:02:32,429 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [730581209] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:02:32,429 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:02:32,429 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 05:02:32,429 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1253943036] [2021-05-06 05:02:32,429 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 05:02:32,429 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:02:32,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 05:02:32,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-06 05:02:32,430 INFO L87 Difference]: Start difference. First operand 53 states and 60 transitions. Second operand has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 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 05:02:32,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:02:32,471 INFO L93 Difference]: Finished difference Result 55 states and 61 transitions. [2021-05-06 05:02:32,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 05:02:32,471 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 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 37 [2021-05-06 05:02:32,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:02:32,472 INFO L225 Difference]: With dead ends: 55 [2021-05-06 05:02:32,472 INFO L226 Difference]: Without dead ends: 49 [2021-05-06 05:02:32,473 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 33.5ms TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-05-06 05:02:32,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-06 05:02:32,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-05-06 05:02:32,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 32 states have (on average 1.125) internal successors, (36), 34 states have internal predecessors, (36), 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 05:02:32,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2021-05-06 05:02:32,478 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 37 [2021-05-06 05:02:32,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:02:32,478 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2021-05-06 05:02:32,478 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 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 05:02:32,478 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2021-05-06 05:02:32,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-06 05:02:32,479 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:02:32,479 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:02:32,692 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:02:32,692 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:02:32,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:02:32,692 INFO L82 PathProgramCache]: Analyzing trace with hash -1224790937, now seen corresponding path program 3 times [2021-05-06 05:02:32,692 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:02:32,693 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2107643198] [2021-05-06 05:02:32,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:02:32,704 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:02:32,704 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [66788669] [2021-05-06 05:02:32,704 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 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 05:02:34,544 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-06 05:02:34,544 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:02:34,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-06 05:02:34,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:02:34,609 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:34,613 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:34,623 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:34,631 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 19 proven. 1 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-06 05:02:34,631 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:02:34,631 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2107643198] [2021-05-06 05:02:34,631 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:02:34,632 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [66788669] [2021-05-06 05:02:34,632 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [66788669] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:02:34,632 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:02:34,632 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 05:02:34,632 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1986380902] [2021-05-06 05:02:34,632 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 05:02:34,632 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:02:34,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 05:02:34,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-05-06 05:02:34,633 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-05-06 05:02:34,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:02:34,686 INFO L93 Difference]: Finished difference Result 55 states and 59 transitions. [2021-05-06 05:02:34,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 05:02:34,686 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 42 [2021-05-06 05:02:34,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:02:34,687 INFO L225 Difference]: With dead ends: 55 [2021-05-06 05:02:34,689 INFO L226 Difference]: Without dead ends: 51 [2021-05-06 05:02:34,689 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 31.0ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-06 05:02:34,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-06 05:02:34,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 44. [2021-05-06 05:02:34,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 30 states have internal predecessors, (32), 8 states have call successors, (8), 7 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 05:02:34,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2021-05-06 05:02:34,703 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 42 [2021-05-06 05:02:34,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:02:34,703 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2021-05-06 05:02:34,703 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-05-06 05:02:34,703 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2021-05-06 05:02:34,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-06 05:02:34,704 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:02:34,705 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:02:34,912 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-06 05:02:34,913 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:02:34,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:02:34,913 INFO L82 PathProgramCache]: Analyzing trace with hash 1537538120, now seen corresponding path program 2 times [2021-05-06 05:02:34,913 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:02:34,913 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1142504707] [2021-05-06 05:02:34,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:02:34,942 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:02:34,942 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1170353879] [2021-05-06 05:02:34,942 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 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 05:02:35,085 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 05:02:35,085 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:02:35,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-06 05:02:35,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:02:35,114 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:35,115 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:35,122 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:35,124 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:35,137 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:35,138 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:35,147 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:35,150 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:35,167 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:35,168 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:35,169 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:35,170 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:35,170 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:35,170 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:35,180 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:35,228 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:35,229 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:35,230 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:35,230 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:35,251 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:36,921 WARN L205 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 8 [2021-05-06 05:02:36,923 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:36,924 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:36,927 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:36,938 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:36,951 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 16 proven. 13 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-06 05:02:36,951 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:02:36,952 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1142504707] [2021-05-06 05:02:36,952 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:02:36,952 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1170353879] [2021-05-06 05:02:36,952 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1170353879] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:02:36,952 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:02:36,952 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-06 05:02:36,952 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528866207] [2021-05-06 05:02:36,952 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 05:02:36,952 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:02:36,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 05:02:36,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-05-06 05:02:36,953 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand has 11 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 6 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-06 05:02:37,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:02:37,087 INFO L93 Difference]: Finished difference Result 52 states and 56 transitions. [2021-05-06 05:02:37,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 05:02:37,087 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 6 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 45 [2021-05-06 05:02:37,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:02:37,088 INFO L225 Difference]: With dead ends: 52 [2021-05-06 05:02:37,088 INFO L226 Difference]: Without dead ends: 46 [2021-05-06 05:02:37,088 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 1784.4ms TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-06 05:02:37,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-06 05:02:37,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2021-05-06 05:02:37,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 31 states have (on average 1.064516129032258) internal successors, (33), 31 states have internal predecessors, (33), 9 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 05:02:37,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2021-05-06 05:02:37,093 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 45 [2021-05-06 05:02:37,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:02:37,093 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2021-05-06 05:02:37,093 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 6 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-06 05:02:37,093 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2021-05-06 05:02:37,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-06 05:02:37,093 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:02:37,094 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:02:37,298 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:02:37,299 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:02:37,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:02:37,299 INFO L82 PathProgramCache]: Analyzing trace with hash -1448798205, now seen corresponding path program 1 times [2021-05-06 05:02:37,299 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:02:37,299 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1789401123] [2021-05-06 05:02:37,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:02:37,305 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:02:37,305 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [174405029] [2021-05-06 05:02:37,305 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 05:02:37,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:02:37,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 05:02:37,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:02:37,376 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:37,378 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:37,378 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:37,388 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:37,389 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:37,390 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:37,402 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:37,404 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:37,404 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:37,417 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:37,419 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:37,419 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:37,433 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:37,434 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:37,448 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 18 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:02:37,448 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:02:37,448 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1789401123] [2021-05-06 05:02:37,448 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:02:37,448 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [174405029] [2021-05-06 05:02:37,448 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [174405029] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:02:37,448 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:02:37,448 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 05:02:37,448 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061830038] [2021-05-06 05:02:37,449 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 05:02:37,449 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:02:37,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 05:02:37,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-06 05:02:37,449 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 6 states have internal predecessors, (32), 6 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 05:02:37,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:02:37,492 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2021-05-06 05:02:37,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 05:02:37,492 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 6 states have internal predecessors, (32), 6 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) Word has length 47 [2021-05-06 05:02:37,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:02:37,493 INFO L225 Difference]: With dead ends: 62 [2021-05-06 05:02:37,493 INFO L226 Difference]: Without dead ends: 52 [2021-05-06 05:02:37,493 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 27.0ms TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-05-06 05:02:37,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-06 05:02:37,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2021-05-06 05:02:37,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 36 states have (on average 1.0555555555555556) internal successors, (38), 36 states have internal predecessors, (38), 9 states have call successors, (9), 8 states have call predecessors, (9), 6 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 05:02:37,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2021-05-06 05:02:37,497 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 47 [2021-05-06 05:02:37,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:02:37,497 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2021-05-06 05:02:37,498 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 6 states have internal predecessors, (32), 6 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 05:02:37,498 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2021-05-06 05:02:37,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-06 05:02:37,498 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:02:37,498 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:02:37,718 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:02:37,718 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:02:37,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:02:37,719 INFO L82 PathProgramCache]: Analyzing trace with hash 468857897, now seen corresponding path program 3 times [2021-05-06 05:02:37,719 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:02:37,719 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1869500734] [2021-05-06 05:02:37,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:02:37,724 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:02:37,724 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1810531107] [2021-05-06 05:02:37,724 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 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 05:02:38,081 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-06 05:02:38,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:02:38,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-06 05:02:38,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:02:38,152 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:38,152 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:38,153 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:38,153 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:38,161 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:38,170 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:38,172 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:38,179 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:38,180 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:38,183 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:38,191 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:38,199 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 10 proven. 24 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-06 05:02:38,200 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:02:38,200 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1869500734] [2021-05-06 05:02:38,200 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:02:38,200 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1810531107] [2021-05-06 05:02:38,200 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1810531107] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:02:38,200 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:02:38,200 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-06 05:02:38,200 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810767595] [2021-05-06 05:02:38,200 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 05:02:38,201 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:02:38,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 05:02:38,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-05-06 05:02:38,201 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand has 9 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) [2021-05-06 05:02:38,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:02:38,269 INFO L93 Difference]: Finished difference Result 60 states and 64 transitions. [2021-05-06 05:02:38,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 05:02:38,270 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) Word has length 53 [2021-05-06 05:02:38,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:02:38,271 INFO L225 Difference]: With dead ends: 60 [2021-05-06 05:02:38,271 INFO L226 Difference]: Without dead ends: 54 [2021-05-06 05:02:38,271 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 48.6ms TimeCoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-05-06 05:02:38,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-06 05:02:38,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-05-06 05:02:38,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 37 states have (on average 1.054054054054054) internal successors, (39), 37 states have internal predecessors, (39), 10 states have call successors, (10), 8 states have call predecessors, (10), 6 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 05:02:38,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 57 transitions. [2021-05-06 05:02:38,276 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 57 transitions. Word has length 53 [2021-05-06 05:02:38,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:02:38,276 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 57 transitions. [2021-05-06 05:02:38,276 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 6 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) [2021-05-06 05:02:38,276 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 57 transitions. [2021-05-06 05:02:38,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 05:02:38,276 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:02:38,276 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:02:38,482 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-06 05:02:38,482 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:02:38,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:02:38,482 INFO L82 PathProgramCache]: Analyzing trace with hash -1953308764, now seen corresponding path program 2 times [2021-05-06 05:02:38,482 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:02:38,483 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1485527011] [2021-05-06 05:02:38,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:02:38,487 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:02:38,487 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1592610332] [2021-05-06 05:02:38,487 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 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 05:02:38,551 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 05:02:38,551 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:02:38,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-06 05:02:38,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:02:38,561 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:38,562 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:38,562 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:38,572 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:38,574 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:38,574 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:38,586 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:38,587 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:38,588 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:38,600 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:38,601 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:38,602 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:38,615 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:38,616 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:38,617 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:38,630 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:38,631 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:38,645 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 24 proven. 56 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:02:38,645 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:02:38,645 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1485527011] [2021-05-06 05:02:38,645 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:02:38,645 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1592610332] [2021-05-06 05:02:38,645 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1592610332] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:02:38,645 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:02:38,645 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-06 05:02:38,645 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1530529166] [2021-05-06 05:02:38,646 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 05:02:38,646 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:02:38,646 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 05:02:38,646 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-06 05:02:38,646 INFO L87 Difference]: Start difference. First operand 54 states and 57 transitions. Second operand has 8 states, 8 states have (on average 4.75) internal successors, (38), 7 states have internal predecessors, (38), 7 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 05:02:38,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:02:38,699 INFO L93 Difference]: Finished difference Result 70 states and 72 transitions. [2021-05-06 05:02:38,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 05:02:38,700 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.75) internal successors, (38), 7 states have internal predecessors, (38), 7 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) Word has length 55 [2021-05-06 05:02:38,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:02:38,700 INFO L225 Difference]: With dead ends: 70 [2021-05-06 05:02:38,700 INFO L226 Difference]: Without dead ends: 60 [2021-05-06 05:02:38,701 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 36.6ms TimeCoverageRelationStatistics Valid=51, Invalid=81, Unknown=0, NotChecked=0, Total=132 [2021-05-06 05:02:38,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-06 05:02:38,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-05-06 05:02:38,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 42 states have (on average 1.0476190476190477) internal successors, (44), 42 states have internal predecessors, (44), 10 states have call successors, (10), 9 states have call predecessors, (10), 7 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 05:02:38,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2021-05-06 05:02:38,705 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 55 [2021-05-06 05:02:38,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:02:38,705 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2021-05-06 05:02:38,705 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.75) internal successors, (38), 7 states have internal predecessors, (38), 7 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 05:02:38,706 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2021-05-06 05:02:38,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 05:02:38,706 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:02:38,706 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:02:38,923 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-06 05:02:38,923 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:02:38,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:02:38,924 INFO L82 PathProgramCache]: Analyzing trace with hash 1425669898, now seen corresponding path program 4 times [2021-05-06 05:02:38,924 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:02:38,924 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [535426889] [2021-05-06 05:02:38,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:02:38,929 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:02:38,929 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [303347274] [2021-05-06 05:02:38,929 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 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 05:02:39,004 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 05:02:39,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:02:39,005 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-06 05:02:39,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:02:39,087 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:39,087 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:39,088 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:39,088 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:39,096 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:39,106 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:39,107 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:39,114 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:39,115 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:39,118 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:39,126 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:39,135 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 12 proven. 40 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-05-06 05:02:39,136 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:02:39,136 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [535426889] [2021-05-06 05:02:39,136 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:02:39,136 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [303347274] [2021-05-06 05:02:39,136 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [303347274] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:02:39,136 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:02:39,136 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-06 05:02:39,136 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [39438529] [2021-05-06 05:02:39,136 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 05:02:39,136 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:02:39,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 05:02:39,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-05-06 05:02:39,137 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand has 10 states, 9 states have (on average 3.111111111111111) internal successors, (28), 9 states have internal predecessors, (28), 7 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2021-05-06 05:02:39,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:02:39,243 INFO L93 Difference]: Finished difference Result 68 states and 72 transitions. [2021-05-06 05:02:39,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 05:02:39,244 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 3.111111111111111) internal successors, (28), 9 states have internal predecessors, (28), 7 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) Word has length 61 [2021-05-06 05:02:39,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:02:39,244 INFO L225 Difference]: With dead ends: 68 [2021-05-06 05:02:39,244 INFO L226 Difference]: Without dead ends: 62 [2021-05-06 05:02:39,244 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 58.2ms TimeCoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2021-05-06 05:02:39,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-06 05:02:39,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2021-05-06 05:02:39,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 43 states have (on average 1.0465116279069768) internal successors, (45), 43 states have internal predecessors, (45), 11 states have call successors, (11), 9 states have call predecessors, (11), 7 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 05:02:39,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 65 transitions. [2021-05-06 05:02:39,249 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 65 transitions. Word has length 61 [2021-05-06 05:02:39,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:02:39,249 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 65 transitions. [2021-05-06 05:02:39,249 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 3.111111111111111) internal successors, (28), 9 states have internal predecessors, (28), 7 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2021-05-06 05:02:39,249 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 65 transitions. [2021-05-06 05:02:39,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-06 05:02:39,250 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:02:39,250 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:02:39,466 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-06 05:02:39,467 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:02:39,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:02:39,467 INFO L82 PathProgramCache]: Analyzing trace with hash -1579977147, now seen corresponding path program 3 times [2021-05-06 05:02:39,467 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:02:39,467 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1247661912] [2021-05-06 05:02:39,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:02:39,472 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:02:39,472 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2108610012] [2021-05-06 05:02:39,472 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:02:39,995 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-05-06 05:02:39,995 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:02:39,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-06 05:02:39,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:02:40,005 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:40,006 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:40,006 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:40,016 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:40,017 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:40,017 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:40,029 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:40,030 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:40,031 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:40,043 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:40,044 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:40,044 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:40,057 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:40,058 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:40,059 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:40,072 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:40,073 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:40,074 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:40,087 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:40,088 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:40,102 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 30 proven. 90 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:02:40,102 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:02:40,102 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1247661912] [2021-05-06 05:02:40,102 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:02:40,102 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2108610012] [2021-05-06 05:02:40,102 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2108610012] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:02:40,102 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:02:40,102 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-06 05:02:40,102 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178959067] [2021-05-06 05:02:40,102 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 05:02:40,102 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:02:40,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 05:02:40,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-06 05:02:40,103 INFO L87 Difference]: Start difference. First operand 62 states and 65 transitions. Second operand has 9 states, 9 states have (on average 4.888888888888889) internal successors, (44), 8 states have internal predecessors, (44), 8 states have call successors, (10), 8 states have call predecessors, (10), 7 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 05:02:40,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:02:40,167 INFO L93 Difference]: Finished difference Result 78 states and 80 transitions. [2021-05-06 05:02:40,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 05:02:40,168 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.888888888888889) internal successors, (44), 8 states have internal predecessors, (44), 8 states have call successors, (10), 8 states have call predecessors, (10), 7 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) Word has length 63 [2021-05-06 05:02:40,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:02:40,168 INFO L225 Difference]: With dead ends: 78 [2021-05-06 05:02:40,168 INFO L226 Difference]: Without dead ends: 68 [2021-05-06 05:02:40,169 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 47.8ms TimeCoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2021-05-06 05:02:40,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-05-06 05:02:40,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-05-06 05:02:40,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 48 states have (on average 1.0416666666666667) internal successors, (50), 48 states have internal predecessors, (50), 11 states have call successors, (11), 10 states have call predecessors, (11), 8 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 05:02:40,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2021-05-06 05:02:40,173 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 63 [2021-05-06 05:02:40,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:02:40,173 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2021-05-06 05:02:40,173 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 4.888888888888889) internal successors, (44), 8 states have internal predecessors, (44), 8 states have call successors, (10), 8 states have call predecessors, (10), 7 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 05:02:40,173 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2021-05-06 05:02:40,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-06 05:02:40,173 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:02:40,174 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:02:40,379 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:02:40,379 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:02:40,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:02:40,380 INFO L82 PathProgramCache]: Analyzing trace with hash -423798549, now seen corresponding path program 5 times [2021-05-06 05:02:40,380 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:02:40,380 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [632343953] [2021-05-06 05:02:40,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:02:40,385 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:02:40,385 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [510445338] [2021-05-06 05:02:40,385 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 05:02:40,911 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-06 05:02:40,911 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:02:40,912 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-06 05:02:40,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:02:41,024 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,025 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,026 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,026 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,033 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,043 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,044 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,052 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,054 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,064 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,073 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 14 proven. 60 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-05-06 05:02:41,074 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:02:41,074 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [632343953] [2021-05-06 05:02:41,074 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:02:41,074 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [510445338] [2021-05-06 05:02:41,074 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [510445338] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:02:41,074 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:02:41,074 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-06 05:02:41,074 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [532696211] [2021-05-06 05:02:41,074 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 05:02:41,074 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:02:41,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 05:02:41,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2021-05-06 05:02:41,075 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand has 11 states, 10 states have (on average 3.1) internal successors, (31), 10 states have internal predecessors, (31), 8 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) [2021-05-06 05:02:41,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:02:41,184 INFO L93 Difference]: Finished difference Result 76 states and 80 transitions. [2021-05-06 05:02:41,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 05:02:41,185 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 3.1) internal successors, (31), 10 states have internal predecessors, (31), 8 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) Word has length 69 [2021-05-06 05:02:41,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:02:41,185 INFO L225 Difference]: With dead ends: 76 [2021-05-06 05:02:41,185 INFO L226 Difference]: Without dead ends: 70 [2021-05-06 05:02:41,186 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 68.0ms TimeCoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2021-05-06 05:02:41,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-05-06 05:02:41,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2021-05-06 05:02:41,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 49 states have (on average 1.0408163265306123) internal successors, (51), 49 states have internal predecessors, (51), 12 states have call successors, (12), 10 states have call predecessors, (12), 8 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 05:02:41,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 73 transitions. [2021-05-06 05:02:41,190 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 73 transitions. Word has length 69 [2021-05-06 05:02:41,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:02:41,190 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 73 transitions. [2021-05-06 05:02:41,190 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 3.1) internal successors, (31), 10 states have internal predecessors, (31), 8 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) [2021-05-06 05:02:41,190 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 73 transitions. [2021-05-06 05:02:41,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-06 05:02:41,191 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:02:41,191 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:02:41,397 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:02:41,397 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:02:41,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:02:41,397 INFO L82 PathProgramCache]: Analyzing trace with hash -802694170, now seen corresponding path program 4 times [2021-05-06 05:02:41,398 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:02:41,398 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1911949386] [2021-05-06 05:02:41,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:02:41,402 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:02:41,402 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [877038200] [2021-05-06 05:02:41,402 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 05:02:41,484 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 05:02:41,484 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:02:41,485 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-06 05:02:41,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:02:41,492 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,493 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,494 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,503 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,504 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,504 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,516 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,517 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,517 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,529 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,530 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,530 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,543 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,544 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,544 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,557 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,559 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,559 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,573 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,574 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,574 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,603 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,604 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,617 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 36 proven. 132 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:02:41,618 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:02:41,618 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1911949386] [2021-05-06 05:02:41,618 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:02:41,618 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [877038200] [2021-05-06 05:02:41,618 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [877038200] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:02:41,618 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:02:41,618 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-06 05:02:41,620 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44464599] [2021-05-06 05:02:41,620 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 05:02:41,620 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:02:41,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 05:02:41,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-06 05:02:41,621 INFO L87 Difference]: Start difference. First operand 70 states and 73 transitions. Second operand has 10 states, 10 states have (on average 5.0) internal successors, (50), 9 states have internal predecessors, (50), 9 states have call successors, (11), 9 states have call predecessors, (11), 8 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 05:02:41,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:02:41,697 INFO L93 Difference]: Finished difference Result 86 states and 88 transitions. [2021-05-06 05:02:41,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 05:02:41,697 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 5.0) internal successors, (50), 9 states have internal predecessors, (50), 9 states have call successors, (11), 9 states have call predecessors, (11), 8 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) Word has length 71 [2021-05-06 05:02:41,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:02:41,698 INFO L225 Difference]: With dead ends: 86 [2021-05-06 05:02:41,698 INFO L226 Difference]: Without dead ends: 76 [2021-05-06 05:02:41,698 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 74.5ms TimeCoverageRelationStatistics Valid=92, Invalid=148, Unknown=0, NotChecked=0, Total=240 [2021-05-06 05:02:41,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-06 05:02:41,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2021-05-06 05:02:41,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 54 states have (on average 1.037037037037037) internal successors, (56), 54 states have internal predecessors, (56), 12 states have call successors, (12), 11 states have call predecessors, (12), 9 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 05:02:41,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2021-05-06 05:02:41,702 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 71 [2021-05-06 05:02:41,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:02:41,703 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2021-05-06 05:02:41,703 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 5.0) internal successors, (50), 9 states have internal predecessors, (50), 9 states have call successors, (11), 9 states have call predecessors, (11), 8 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 05:02:41,703 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2021-05-06 05:02:41,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-06 05:02:41,703 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:02:41,703 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 7, 7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:02:41,920 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:02:41,921 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:02:41,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:02:41,921 INFO L82 PathProgramCache]: Analyzing trace with hash 540885452, now seen corresponding path program 6 times [2021-05-06 05:02:41,921 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:02:41,921 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [102636141] [2021-05-06 05:02:41,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:02:41,933 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:02:41,933 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [509648719] [2021-05-06 05:02:41,933 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 05:02:43,371 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-06 05:02:43,371 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:02:43,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 32 conjunts are in the unsatisfiable core [2021-05-06 05:02:43,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:02:43,506 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:43,506 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:43,507 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:43,508 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:43,523 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:43,538 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:43,539 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:43,551 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:43,552 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:43,558 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:43,569 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:43,589 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 16 proven. 84 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-05-06 05:02:43,589 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:02:43,589 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [102636141] [2021-05-06 05:02:43,589 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:02:43,589 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [509648719] [2021-05-06 05:02:43,589 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [509648719] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:02:43,589 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:02:43,589 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-06 05:02:43,590 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2087351974] [2021-05-06 05:02:43,602 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 05:02:43,602 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:02:43,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 05:02:43,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2021-05-06 05:02:43,602 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand has 12 states, 11 states have (on average 3.090909090909091) internal successors, (34), 11 states have internal predecessors, (34), 9 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2021-05-06 05:02:43,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:02:43,800 INFO L93 Difference]: Finished difference Result 84 states and 88 transitions. [2021-05-06 05:02:43,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 05:02:43,800 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 3.090909090909091) internal successors, (34), 11 states have internal predecessors, (34), 9 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) Word has length 77 [2021-05-06 05:02:43,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:02:43,801 INFO L225 Difference]: With dead ends: 84 [2021-05-06 05:02:43,801 INFO L226 Difference]: Without dead ends: 78 [2021-05-06 05:02:43,802 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 106.6ms TimeCoverageRelationStatistics Valid=29, Invalid=153, Unknown=0, NotChecked=0, Total=182 [2021-05-06 05:02:43,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-05-06 05:02:43,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2021-05-06 05:02:43,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 55 states have (on average 1.0363636363636364) internal successors, (57), 55 states have internal predecessors, (57), 13 states have call successors, (13), 11 states have call predecessors, (13), 9 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-06 05:02:43,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 81 transitions. [2021-05-06 05:02:43,818 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 81 transitions. Word has length 77 [2021-05-06 05:02:43,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:02:43,818 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 81 transitions. [2021-05-06 05:02:43,818 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 11 states have (on average 3.090909090909091) internal successors, (34), 11 states have internal predecessors, (34), 9 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2021-05-06 05:02:43,818 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 81 transitions. [2021-05-06 05:02:43,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 05:02:43,819 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:02:43,820 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:02:44,026 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-06 05:02:44,027 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:02:44,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:02:44,028 INFO L82 PathProgramCache]: Analyzing trace with hash -1454305145, now seen corresponding path program 5 times [2021-05-06 05:02:44,028 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:02:44,028 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1137137325] [2021-05-06 05:02:44,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:02:44,039 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:02:44,039 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1406221042] [2021-05-06 05:02:44,039 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 05:02:45,170 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-05-06 05:02:45,170 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:02:45,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-06 05:02:45,174 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:02:45,182 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:45,183 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:45,190 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:45,200 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:45,210 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:45,210 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:45,228 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:45,229 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:45,229 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:45,250 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:45,265 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:45,266 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:45,280 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:45,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:45,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:45,310 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:45,312 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:45,312 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:45,326 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:45,327 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:45,328 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:45,356 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:45,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:45,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:45,376 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:45,393 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:45,407 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 42 proven. 182 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:02:45,407 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:02:45,407 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1137137325] [2021-05-06 05:02:45,407 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:02:45,407 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1406221042] [2021-05-06 05:02:45,407 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1406221042] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:02:45,407 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:02:45,407 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-06 05:02:45,407 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1001109642] [2021-05-06 05:02:45,408 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 05:02:45,409 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:02:45,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 05:02:45,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-06 05:02:45,409 INFO L87 Difference]: Start difference. First operand 78 states and 81 transitions. Second operand has 11 states, 11 states have (on average 5.090909090909091) internal successors, (56), 10 states have internal predecessors, (56), 10 states have call successors, (12), 10 states have call predecessors, (12), 9 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 05:02:45,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:02:45,526 INFO L93 Difference]: Finished difference Result 94 states and 96 transitions. [2021-05-06 05:02:45,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 05:02:45,526 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 5.090909090909091) internal successors, (56), 10 states have internal predecessors, (56), 10 states have call successors, (12), 10 states have call predecessors, (12), 9 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) Word has length 79 [2021-05-06 05:02:45,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:02:45,527 INFO L225 Difference]: With dead ends: 94 [2021-05-06 05:02:45,527 INFO L226 Difference]: Without dead ends: 84 [2021-05-06 05:02:45,528 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 91.3ms TimeCoverageRelationStatistics Valid=117, Invalid=189, Unknown=0, NotChecked=0, Total=306 [2021-05-06 05:02:45,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-05-06 05:02:45,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2021-05-06 05:02:45,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 60 states have (on average 1.0333333333333334) internal successors, (62), 60 states have internal predecessors, (62), 13 states have call successors, (13), 12 states have call predecessors, (13), 10 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-06 05:02:45,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2021-05-06 05:02:45,533 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 79 [2021-05-06 05:02:45,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:02:45,534 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2021-05-06 05:02:45,534 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 5.090909090909091) internal successors, (56), 10 states have internal predecessors, (56), 10 states have call successors, (12), 10 states have call predecessors, (12), 9 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 05:02:45,534 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2021-05-06 05:02:45,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 05:02:45,534 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:02:45,534 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 9, 8, 8, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:02:45,741 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-06 05:02:45,741 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:02:45,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:02:45,741 INFO L82 PathProgramCache]: Analyzing trace with hash -1082476115, now seen corresponding path program 7 times [2021-05-06 05:02:45,742 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:02:45,742 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1126873463] [2021-05-06 05:02:45,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:02:45,747 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:02:45,747 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [46533392] [2021-05-06 05:02:45,747 INFO L93 rtionOrderModulation]: Changing assertion order to 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 05:02:46,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:02:46,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 36 conjunts are in the unsatisfiable core [2021-05-06 05:02:46,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:02:46,596 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:46,597 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:46,598 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:46,598 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:46,605 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:46,617 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:46,618 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:46,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:46,625 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:46,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:46,637 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:46,649 INFO L134 CoverageAnalysis]: Checked inductivity of 274 backedges. 18 proven. 112 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-06 05:02:46,649 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:02:46,649 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1126873463] [2021-05-06 05:02:46,649 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:02:46,649 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [46533392] [2021-05-06 05:02:46,649 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [46533392] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:02:46,649 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:02:46,649 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-06 05:02:46,649 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1413744277] [2021-05-06 05:02:46,649 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 05:02:46,649 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:02:46,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 05:02:46,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2021-05-06 05:02:46,650 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand has 13 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 12 states have internal predecessors, (37), 10 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) [2021-05-06 05:02:46,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:02:46,798 INFO L93 Difference]: Finished difference Result 92 states and 96 transitions. [2021-05-06 05:02:46,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 05:02:46,799 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 12 states have internal predecessors, (37), 10 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) Word has length 85 [2021-05-06 05:02:46,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:02:46,799 INFO L225 Difference]: With dead ends: 92 [2021-05-06 05:02:46,799 INFO L226 Difference]: Without dead ends: 86 [2021-05-06 05:02:46,800 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 88.1ms TimeCoverageRelationStatistics Valid=31, Invalid=179, Unknown=0, NotChecked=0, Total=210 [2021-05-06 05:02:46,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-06 05:02:46,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2021-05-06 05:02:46,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 61 states have (on average 1.0327868852459017) internal successors, (63), 61 states have internal predecessors, (63), 14 states have call successors, (14), 12 states have call predecessors, (14), 10 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-06 05:02:46,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 89 transitions. [2021-05-06 05:02:46,804 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 89 transitions. Word has length 85 [2021-05-06 05:02:46,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:02:46,804 INFO L480 AbstractCegarLoop]: Abstraction has 86 states and 89 transitions. [2021-05-06 05:02:46,805 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 12 states have internal predecessors, (37), 10 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) [2021-05-06 05:02:46,805 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 89 transitions. [2021-05-06 05:02:46,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-05-06 05:02:46,805 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:02:46,805 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:02:47,020 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-05-06 05:02:47,020 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:02:47,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:02:47,020 INFO L82 PathProgramCache]: Analyzing trace with hash 1863324712, now seen corresponding path program 6 times [2021-05-06 05:02:47,021 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:02:47,021 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [653590280] [2021-05-06 05:02:47,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:02:47,025 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:02:47,025 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1535618180] [2021-05-06 05:02:47,025 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:02:47,422 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2021-05-06 05:02:47,422 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:02:47,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-06 05:02:47,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:02:47,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:47,433 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:47,433 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:47,443 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:47,444 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:47,444 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:47,457 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:47,458 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:47,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:47,472 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:47,473 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:47,473 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:47,485 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:47,486 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:47,486 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:47,499 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:47,500 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:47,500 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:47,514 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:47,515 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:47,515 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:47,529 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:47,530 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:47,531 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:47,546 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:47,547 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:47,547 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:47,563 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:47,564 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:47,578 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 48 proven. 240 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:02:47,578 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:02:47,578 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [653590280] [2021-05-06 05:02:47,578 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:02:47,578 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1535618180] [2021-05-06 05:02:47,578 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1535618180] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:02:47,578 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:02:47,578 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-06 05:02:47,579 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [698591200] [2021-05-06 05:02:47,579 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 05:02:47,579 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:02:47,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 05:02:47,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2021-05-06 05:02:47,581 INFO L87 Difference]: Start difference. First operand 86 states and 89 transitions. Second operand has 12 states, 12 states have (on average 5.166666666666667) internal successors, (62), 11 states have internal predecessors, (62), 11 states have call successors, (13), 11 states have call predecessors, (13), 10 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-06 05:02:47,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:02:47,705 INFO L93 Difference]: Finished difference Result 102 states and 104 transitions. [2021-05-06 05:02:47,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 05:02:47,706 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 5.166666666666667) internal successors, (62), 11 states have internal predecessors, (62), 11 states have call successors, (13), 11 states have call predecessors, (13), 10 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) Word has length 87 [2021-05-06 05:02:47,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:02:47,706 INFO L225 Difference]: With dead ends: 102 [2021-05-06 05:02:47,707 INFO L226 Difference]: Without dead ends: 92 [2021-05-06 05:02:47,707 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 88.1ms TimeCoverageRelationStatistics Valid=145, Invalid=235, Unknown=0, NotChecked=0, Total=380 [2021-05-06 05:02:47,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-05-06 05:02:47,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2021-05-06 05:02:47,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 66 states have (on average 1.0303030303030303) internal successors, (68), 66 states have internal predecessors, (68), 14 states have call successors, (14), 13 states have call predecessors, (14), 11 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-06 05:02:47,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2021-05-06 05:02:47,712 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 87 [2021-05-06 05:02:47,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:02:47,712 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2021-05-06 05:02:47,712 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 5.166666666666667) internal successors, (62), 11 states have internal predecessors, (62), 11 states have call successors, (13), 11 states have call predecessors, (13), 10 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-06 05:02:47,712 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2021-05-06 05:02:47,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-06 05:02:47,713 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:02:47,713 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 10, 9, 9, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:02:47,913 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-06 05:02:47,913 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:02:47,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:02:47,913 INFO L82 PathProgramCache]: Analyzing trace with hash -243875698, now seen corresponding path program 8 times [2021-05-06 05:02:47,914 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:02:47,914 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [993104516] [2021-05-06 05:02:47,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:02:47,919 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:02:47,919 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1230268099] [2021-05-06 05:02:47,919 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 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 05:12:00,315 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 05:12:00,316 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:12:00,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 40 conjunts are in the unsatisfiable core [2021-05-06 05:12:00,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:12:00,549 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:00,549 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:00,550 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:00,550 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:00,556 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:00,568 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:00,568 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:00,574 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:00,575 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:00,578 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:00,589 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:00,600 INFO L134 CoverageAnalysis]: Checked inductivity of 344 backedges. 20 proven. 144 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-05-06 05:12:00,601 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:12:00,601 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [993104516] [2021-05-06 05:12:00,601 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:12:00,601 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1230268099] [2021-05-06 05:12:00,601 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1230268099] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:12:00,601 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:12:00,601 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-05-06 05:12:00,601 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [460516432] [2021-05-06 05:12:00,601 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 05:12:00,601 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:12:00,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 05:12:00,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2021-05-06 05:12:00,602 INFO L87 Difference]: Start difference. First operand 92 states and 94 transitions. Second operand has 14 states, 13 states have (on average 3.076923076923077) internal successors, (40), 13 states have internal predecessors, (40), 11 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) [2021-05-06 05:12:00,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:12:00,767 INFO L93 Difference]: Finished difference Result 100 states and 104 transitions. [2021-05-06 05:12:00,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 05:12:00,767 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 3.076923076923077) internal successors, (40), 13 states have internal predecessors, (40), 11 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) Word has length 93 [2021-05-06 05:12:00,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:12:00,768 INFO L225 Difference]: With dead ends: 100 [2021-05-06 05:12:00,768 INFO L226 Difference]: Without dead ends: 94 [2021-05-06 05:12:00,768 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 93.8ms TimeCoverageRelationStatistics Valid=33, Invalid=207, Unknown=0, NotChecked=0, Total=240 [2021-05-06 05:12:00,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-05-06 05:12:00,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2021-05-06 05:12:00,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 67 states have (on average 1.0298507462686568) internal successors, (69), 67 states have internal predecessors, (69), 15 states have call successors, (15), 13 states have call predecessors, (15), 11 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-06 05:12:00,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 97 transitions. [2021-05-06 05:12:00,773 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 97 transitions. Word has length 93 [2021-05-06 05:12:00,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:12:00,773 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 97 transitions. [2021-05-06 05:12:00,773 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 13 states have (on average 3.076923076923077) internal successors, (40), 13 states have internal predecessors, (40), 11 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) [2021-05-06 05:12:00,774 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 97 transitions. [2021-05-06 05:12:00,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-06 05:12:00,774 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:12:00,774 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:12:00,996 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-06 05:12:00,997 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:12:00,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:12:00,997 INFO L82 PathProgramCache]: Analyzing trace with hash 304473801, now seen corresponding path program 7 times [2021-05-06 05:12:00,997 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:12:00,997 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [597860948] [2021-05-06 05:12:00,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:12:01,001 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:12:01,001 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [459089934] [2021-05-06 05:12:01,001 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:12:01,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:12:01,084 INFO L263 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-06 05:12:01,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:12:01,092 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:01,093 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:01,093 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:01,102 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:01,103 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:01,103 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:01,114 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:01,115 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:01,115 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:01,127 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:01,128 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:01,128 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:01,140 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:01,141 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:01,141 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:01,154 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:01,155 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:01,155 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:01,168 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:01,169 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:01,169 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:01,183 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:01,184 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:01,185 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:01,199 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:01,200 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:01,201 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:01,216 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:01,217 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:01,217 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:01,233 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:01,234 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:01,247 INFO L134 CoverageAnalysis]: Checked inductivity of 362 backedges. 54 proven. 306 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:12:01,247 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:12:01,248 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [597860948] [2021-05-06 05:12:01,248 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:12:01,248 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [459089934] [2021-05-06 05:12:01,248 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [459089934] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:12:01,248 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:12:01,248 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-06 05:12:01,248 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1934347377] [2021-05-06 05:12:01,248 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 05:12:01,248 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:12:01,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 05:12:01,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2021-05-06 05:12:01,249 INFO L87 Difference]: Start difference. First operand 94 states and 97 transitions. Second operand has 13 states, 13 states have (on average 5.230769230769231) internal successors, (68), 12 states have internal predecessors, (68), 12 states have call successors, (14), 12 states have call predecessors, (14), 11 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-06 05:12:01,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:12:01,364 INFO L93 Difference]: Finished difference Result 110 states and 112 transitions. [2021-05-06 05:12:01,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 05:12:01,365 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 5.230769230769231) internal successors, (68), 12 states have internal predecessors, (68), 12 states have call successors, (14), 12 states have call predecessors, (14), 11 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) Word has length 95 [2021-05-06 05:12:01,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:12:01,365 INFO L225 Difference]: With dead ends: 110 [2021-05-06 05:12:01,365 INFO L226 Difference]: Without dead ends: 100 [2021-05-06 05:12:01,366 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 102.5ms TimeCoverageRelationStatistics Valid=176, Invalid=286, Unknown=0, NotChecked=0, Total=462 [2021-05-06 05:12:01,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-05-06 05:12:01,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2021-05-06 05:12:01,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 72 states have (on average 1.0277777777777777) internal successors, (74), 72 states have internal predecessors, (74), 15 states have call successors, (15), 14 states have call predecessors, (15), 12 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-06 05:12:01,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 102 transitions. [2021-05-06 05:12:01,370 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 102 transitions. Word has length 95 [2021-05-06 05:12:01,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:12:01,371 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 102 transitions. [2021-05-06 05:12:01,371 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 5.230769230769231) internal successors, (68), 12 states have internal predecessors, (68), 12 states have call successors, (14), 12 states have call predecessors, (14), 11 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-06 05:12:01,371 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 102 transitions. [2021-05-06 05:12:01,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-06 05:12:01,371 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:12:01,371 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 10, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:12:01,588 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:12:01,588 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:12:01,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:12:01,588 INFO L82 PathProgramCache]: Analyzing trace with hash 1379030639, now seen corresponding path program 9 times [2021-05-06 05:12:01,588 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:12:01,588 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1240688674] [2021-05-06 05:12:01,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:12:01,593 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:12:01,593 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [823878352] [2021-05-06 05:12:01,593 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:12:15,645 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-06 05:12:15,646 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:12:15,664 INFO L263 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-06 05:12:15,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:12:15,854 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:15,854 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:15,855 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:15,855 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:15,861 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:15,875 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:15,876 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:15,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:15,883 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:15,885 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:15,897 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:15,910 INFO L134 CoverageAnalysis]: Checked inductivity of 422 backedges. 45 proven. 187 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-05-06 05:12:15,910 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:12:15,910 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1240688674] [2021-05-06 05:12:15,910 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:12:15,910 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [823878352] [2021-05-06 05:12:15,910 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [823878352] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:12:15,910 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:12:15,910 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2021-05-06 05:12:15,910 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377178720] [2021-05-06 05:12:15,910 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 05:12:15,911 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:12:15,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 05:12:15,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=271, Unknown=0, NotChecked=0, Total=306 [2021-05-06 05:12:15,911 INFO L87 Difference]: Start difference. First operand 100 states and 102 transitions. Second operand has 18 states, 17 states have (on average 2.7058823529411766) internal successors, (46), 16 states have internal predecessors, (46), 12 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 12 states have call predecessors, (13), 12 states have call successors, (13) [2021-05-06 05:12:16,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:12:16,211 INFO L93 Difference]: Finished difference Result 108 states and 112 transitions. [2021-05-06 05:12:16,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 05:12:16,211 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.7058823529411766) internal successors, (46), 16 states have internal predecessors, (46), 12 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 12 states have call predecessors, (13), 12 states have call successors, (13) Word has length 101 [2021-05-06 05:12:16,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:12:16,212 INFO L225 Difference]: With dead ends: 108 [2021-05-06 05:12:16,212 INFO L226 Difference]: Without dead ends: 102 [2021-05-06 05:12:16,212 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 156.1ms TimeCoverageRelationStatistics Valid=50, Invalid=370, Unknown=0, NotChecked=0, Total=420 [2021-05-06 05:12:16,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-05-06 05:12:16,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 102. [2021-05-06 05:12:16,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 73 states have (on average 1.0273972602739727) internal successors, (75), 73 states have internal predecessors, (75), 16 states have call successors, (16), 14 states have call predecessors, (16), 12 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-06 05:12:16,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 105 transitions. [2021-05-06 05:12:16,217 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 105 transitions. Word has length 101 [2021-05-06 05:12:16,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:12:16,217 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 105 transitions. [2021-05-06 05:12:16,217 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 17 states have (on average 2.7058823529411766) internal successors, (46), 16 states have internal predecessors, (46), 12 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 12 states have call predecessors, (13), 12 states have call successors, (13) [2021-05-06 05:12:16,217 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 105 transitions. [2021-05-06 05:12:16,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-05-06 05:12:16,217 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:12:16,217 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:12:16,431 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-05-06 05:12:16,432 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:12:16,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:12:16,432 INFO L82 PathProgramCache]: Analyzing trace with hash 844335210, now seen corresponding path program 8 times [2021-05-06 05:12:16,432 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:12:16,432 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [5785460] [2021-05-06 05:12:16,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:12:16,436 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:12:16,437 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1510250315] [2021-05-06 05:12:16,437 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:12:16,497 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 05:12:16,498 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:12:16,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-06 05:12:16,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:12:16,506 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,507 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,507 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,515 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,516 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,517 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,527 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,528 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,528 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,539 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,540 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,540 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,551 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,552 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,552 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,564 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,565 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,565 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,578 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,579 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,579 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,592 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,593 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,593 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,607 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,607 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,608 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,622 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,623 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,644 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,659 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,660 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,660 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,675 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,676 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:16,690 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 60 proven. 380 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 05:12:16,690 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:12:16,690 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [5785460] [2021-05-06 05:12:16,690 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:12:16,690 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1510250315] [2021-05-06 05:12:16,690 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1510250315] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:12:16,690 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:12:16,690 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-05-06 05:12:16,690 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1174832032] [2021-05-06 05:12:16,690 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 05:12:16,690 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:12:16,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 05:12:16,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2021-05-06 05:12:16,691 INFO L87 Difference]: Start difference. First operand 102 states and 105 transitions. Second operand has 14 states, 14 states have (on average 5.285714285714286) internal successors, (74), 13 states have internal predecessors, (74), 13 states have call successors, (15), 13 states have call predecessors, (15), 12 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-06 05:12:16,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:12:16,814 INFO L93 Difference]: Finished difference Result 118 states and 120 transitions. [2021-05-06 05:12:16,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 05:12:16,815 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 5.285714285714286) internal successors, (74), 13 states have internal predecessors, (74), 13 states have call successors, (15), 13 states have call predecessors, (15), 12 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) Word has length 103 [2021-05-06 05:12:16,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:12:16,815 INFO L225 Difference]: With dead ends: 118 [2021-05-06 05:12:16,815 INFO L226 Difference]: Without dead ends: 108 [2021-05-06 05:12:16,816 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 117.0ms TimeCoverageRelationStatistics Valid=210, Invalid=342, Unknown=0, NotChecked=0, Total=552 [2021-05-06 05:12:16,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-05-06 05:12:16,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2021-05-06 05:12:16,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 78 states have (on average 1.0256410256410255) internal successors, (80), 78 states have internal predecessors, (80), 16 states have call successors, (16), 15 states have call predecessors, (16), 13 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-06 05:12:16,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 110 transitions. [2021-05-06 05:12:16,820 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 110 transitions. Word has length 103 [2021-05-06 05:12:16,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:12:16,820 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 110 transitions. [2021-05-06 05:12:16,820 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 5.285714285714286) internal successors, (74), 13 states have internal predecessors, (74), 13 states have call successors, (15), 13 states have call predecessors, (15), 12 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-06 05:12:16,820 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 110 transitions. [2021-05-06 05:12:16,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-05-06 05:12:16,821 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:12:16,821 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 11, 11, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:12:17,034 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:12:17,034 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:12:17,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:12:17,034 INFO L82 PathProgramCache]: Analyzing trace with hash -324109488, now seen corresponding path program 10 times [2021-05-06 05:12:17,034 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:12:17,034 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1183685490] [2021-05-06 05:12:17,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:12:17,039 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:12:17,039 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1798149378] [2021-05-06 05:12:17,039 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 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:12:17,094 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 05:12:17,095 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:12:17,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 48 conjunts are in the unsatisfiable core [2021-05-06 05:12:17,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:12:17,276 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:17,276 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:17,277 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:17,277 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:17,283 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:17,296 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:17,297 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:17,302 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:17,303 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:17,305 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:17,317 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:12:17,329 INFO L134 CoverageAnalysis]: Checked inductivity of 508 backedges. 24 proven. 220 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2021-05-06 05:12:17,329 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:12:17,329 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1183685490] [2021-05-06 05:12:17,329 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:12:17,329 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1798149378] [2021-05-06 05:12:17,329 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1798149378] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:12:17,330 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:12:17,330 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-05-06 05:12:17,331 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271942439] [2021-05-06 05:12:17,331 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 05:12:17,331 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:12:17,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 05:12:17,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2021-05-06 05:12:17,332 INFO L87 Difference]: Start difference. First operand 108 states and 110 transitions. Second operand has 16 states, 15 states have (on average 3.066666666666667) internal successors, (46), 15 states have internal predecessors, (46), 13 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 13 states have call predecessors, (14), 13 states have call successors, (14) [2021-05-06 05:12:17,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:12:17,544 INFO L93 Difference]: Finished difference Result 116 states and 120 transitions. [2021-05-06 05:12:17,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 05:12:17,544 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 3.066666666666667) internal successors, (46), 15 states have internal predecessors, (46), 13 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 13 states have call predecessors, (14), 13 states have call successors, (14) Word has length 109 [2021-05-06 05:12:17,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:12:17,545 INFO L225 Difference]: With dead ends: 116 [2021-05-06 05:12:17,545 INFO L226 Difference]: Without dead ends: 110 [2021-05-06 05:12:17,545 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 118.8ms TimeCoverageRelationStatistics Valid=37, Invalid=269, Unknown=0, NotChecked=0, Total=306 [2021-05-06 05:12:17,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-05-06 05:12:17,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 110. [2021-05-06 05:12:17,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 79 states have (on average 1.0253164556962024) internal successors, (81), 79 states have internal predecessors, (81), 17 states have call successors, (17), 15 states have call predecessors, (17), 13 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-05-06 05:12:17,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 113 transitions. [2021-05-06 05:12:17,550 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 113 transitions. Word has length 109 [2021-05-06 05:12:17,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:12:17,550 INFO L480 AbstractCegarLoop]: Abstraction has 110 states and 113 transitions. [2021-05-06 05:12:17,550 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 15 states have (on average 3.066666666666667) internal successors, (46), 15 states have internal predecessors, (46), 13 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 13 states have call predecessors, (14), 13 states have call successors, (14) [2021-05-06 05:12:17,550 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 113 transitions. [2021-05-06 05:12:17,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-05-06 05:12:17,551 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:12:17,551 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:12:17,760 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-06 05:12:17,761 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:12:17,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:12:17,761 INFO L82 PathProgramCache]: Analyzing trace with hash 509212939, now seen corresponding path program 9 times [2021-05-06 05:12:17,761 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:12:17,761 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [374389093] [2021-05-06 05:12:17,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:12:17,768 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:12:17,768 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1238503226] [2021-05-06 05:12:17,768 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true