/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/loops/sum01_bug02.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 11:51:20,929 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 11:51:20,931 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 11:51:20,960 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 11:51:21,031 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 11:51:21,032 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 11:51:21,032 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 11:51:21,035 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 [2021-05-02 11:51:21,063 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 11:51:21,064 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 11:51:21,066 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 11:51:21,066 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 11:51:21,066 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 11:51:21,066 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 11:51:21,066 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 11:51:21,066 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 11:51:21,067 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 11:51:21,067 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 11:51:21,067 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 11:51:21,067 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 11:51:21,068 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 11:51:21,068 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 11:51:21,068 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 11:51:21,068 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 11:51:21,068 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 11:51:21,068 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 11:51:21,068 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 11:51:21,068 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 11:51:21,069 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 11:51:21,069 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 11:51:21,069 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 11:51:21,069 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 11:51:21,069 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 11:51:21,069 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 11:51:21,069 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 11:51:21,069 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 11:51:21,070 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 11:51:21,304 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 11:51:21,317 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 11:51:21,326 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 11:51:21,327 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 11:51:21,327 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 11:51:21,328 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum01_bug02.i [2021-05-02 11:51:21,384 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/11a17cb91/f638c29665cc4edfbc74e944a7ff3f35/FLAG0fb2fda1c [2021-05-02 11:51:21,683 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 11:51:21,683 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01_bug02.i [2021-05-02 11:51:21,688 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/11a17cb91/f638c29665cc4edfbc74e944a7ff3f35/FLAG0fb2fda1c [2021-05-02 11:51:22,125 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/11a17cb91/f638c29665cc4edfbc74e944a7ff3f35 [2021-05-02 11:51:22,128 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 11:51:22,129 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 11:51:22,131 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 11:51:22,131 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 11:51:22,133 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 11:51:22,134 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:51:22" (1/1) ... [2021-05-02 11:51:22,135 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@265d5885 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:22, skipping insertion in model container [2021-05-02 11:51:22,135 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:51:22" (1/1) ... [2021-05-02 11:51:22,140 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 11:51:22,148 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 11:51:22,241 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01_bug02.i[812,825] [2021-05-02 11:51:22,247 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 11:51:22,252 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 11:51:22,270 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01_bug02.i[812,825] [2021-05-02 11:51:22,272 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 11:51:22,293 INFO L208 MainTranslator]: Completed translation [2021-05-02 11:51:22,293 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:22 WrapperNode [2021-05-02 11:51:22,293 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 11:51:22,294 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 11:51:22,294 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 11:51:22,294 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 11:51:22,300 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:22" (1/1) ... [2021-05-02 11:51:22,300 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:22" (1/1) ... [2021-05-02 11:51:22,304 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:22" (1/1) ... [2021-05-02 11:51:22,304 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:22" (1/1) ... [2021-05-02 11:51:22,307 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:22" (1/1) ... [2021-05-02 11:51:22,309 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:22" (1/1) ... [2021-05-02 11:51:22,310 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:22" (1/1) ... [2021-05-02 11:51:22,311 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 11:51:22,311 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 11:51:22,311 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 11:51:22,312 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 11:51:22,312 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:22" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 11:51:22,385 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 11:51:22,386 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 11:51:22,386 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 11:51:22,386 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 11:51:22,386 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 11:51:22,386 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 11:51:22,386 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 11:51:22,386 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 11:51:22,386 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 11:51:22,386 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 11:51:22,386 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 11:51:22,386 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 11:51:22,386 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2021-05-02 11:51:22,387 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 11:51:22,387 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 11:51:22,387 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 11:51:22,387 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 11:51:22,387 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 11:51:22,387 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 11:51:22,387 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 11:51:22,542 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 11:51:22,543 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 11:51:22,544 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:51:22 BoogieIcfgContainer [2021-05-02 11:51:22,544 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 11:51:22,545 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 11:51:22,545 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 11:51:22,547 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 11:51:22,548 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 11:51:22" (1/3) ... [2021-05-02 11:51:22,549 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3f6006dd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:51:22, skipping insertion in model container [2021-05-02 11:51:22,549 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:22" (2/3) ... [2021-05-02 11:51:22,565 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3f6006dd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:51:22, skipping insertion in model container [2021-05-02 11:51:22,565 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:51:22" (3/3) ... [2021-05-02 11:51:22,566 INFO L111 eAbstractionObserver]: Analyzing ICFG sum01_bug02.i [2021-05-02 11:51:22,570 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 11:51:22,572 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 11:51:22,583 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 11:51:22,598 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 11:51:22,598 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 11:51:22,598 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 11:51:22,598 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 11:51:22,599 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 11:51:22,599 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 11:51:22,599 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 11:51:22,599 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 11:51:22,622 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 11:51:22,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 11:51:22,625 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:22,625 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:22,625 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:22,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:22,629 INFO L82 PathProgramCache]: Analyzing trace with hash -872495525, now seen corresponding path program 1 times [2021-05-02 11:51:22,634 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:22,634 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1887301685] [2021-05-02 11:51:22,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:22,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:22,763 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:22,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:22,774 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:22,775 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:22,775 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1887301685] [2021-05-02 11:51:22,775 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1887301685] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:51:22,776 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 11:51:22,776 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 11:51:22,776 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [792660319] [2021-05-02 11:51:22,779 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 11:51:22,779 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:22,786 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 11:51:22,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 11:51:22,788 INFO L87 Difference]: Start difference. First operand has 21 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:22,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:22,818 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2021-05-02 11:51:22,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 11:51:22,820 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 11:51:22,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:22,823 INFO L225 Difference]: With dead ends: 32 [2021-05-02 11:51:22,823 INFO L226 Difference]: Without dead ends: 15 [2021-05-02 11:51:22,825 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 19.0ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 11:51:22,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-05-02 11:51:22,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-05-02 11:51:22,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:22,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-05-02 11:51:22,846 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2021-05-02 11:51:22,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:22,847 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-05-02 11:51:22,847 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:22,847 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-05-02 11:51:22,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 11:51:22,847 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:22,848 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:22,848 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 11:51:22,848 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:22,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:22,849 INFO L82 PathProgramCache]: Analyzing trace with hash -884501298, now seen corresponding path program 1 times [2021-05-02 11:51:22,849 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:22,849 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1597969132] [2021-05-02 11:51:22,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:22,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:22,920 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:22,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:22,927 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:22,928 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:22,928 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1597969132] [2021-05-02 11:51:22,928 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1597969132] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:51:22,928 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 11:51:22,928 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 11:51:22,928 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [282691823] [2021-05-02 11:51:22,929 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 11:51:22,929 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:22,930 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 11:51:22,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 11:51:22,930 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:23,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:23,028 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2021-05-02 11:51:23,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 11:51:23,028 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 11:51:23,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:23,029 INFO L225 Difference]: With dead ends: 24 [2021-05-02 11:51:23,029 INFO L226 Difference]: Without dead ends: 19 [2021-05-02 11:51:23,030 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 79.3ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-02 11:51:23,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-02 11:51:23,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-05-02 11:51:23,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:23,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2021-05-02 11:51:23,034 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 11 [2021-05-02 11:51:23,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:23,034 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2021-05-02 11:51:23,034 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:23,034 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2021-05-02 11:51:23,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 11:51:23,035 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:23,035 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:23,035 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 11:51:23,035 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:23,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:23,035 INFO L82 PathProgramCache]: Analyzing trace with hash 60854025, now seen corresponding path program 1 times [2021-05-02 11:51:23,036 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:23,036 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [139382921] [2021-05-02 11:51:23,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:23,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:23,210 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:23,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:23,235 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:23,236 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:23,236 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [139382921] [2021-05-02 11:51:23,236 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [139382921] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:23,236 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1591558540] [2021-05-02 11:51:23,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:51:23,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:23,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 11:51:23,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:51:23,364 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:23,388 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:23,390 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:23,417 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:23,446 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:23,447 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1591558540] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:23,447 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:51:23,448 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 15 [2021-05-02 11:51:23,448 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80904567] [2021-05-02 11:51:23,448 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 11:51:23,448 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:23,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 11:51:23,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-02 11:51:23,453 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 15 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 states have internal predecessors, (18), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:23,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:23,675 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2021-05-02 11:51:23,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 11:51:23,675 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 states have internal predecessors, (18), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 11:51:23,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:23,677 INFO L225 Difference]: With dead ends: 34 [2021-05-02 11:51:23,677 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 11:51:23,677 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 261.8ms TimeCoverageRelationStatistics Valid=84, Invalid=378, Unknown=0, NotChecked=0, Total=462 [2021-05-02 11:51:23,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 11:51:23,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 24. [2021-05-02 11:51:23,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 19 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:23,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2021-05-02 11:51:23,684 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 15 [2021-05-02 11:51:23,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:23,684 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2021-05-02 11:51:23,684 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 states have internal predecessors, (18), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:23,685 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2021-05-02 11:51:23,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 11:51:23,686 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:23,686 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:23,893 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 11:51:23,893 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:23,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:23,894 INFO L82 PathProgramCache]: Analyzing trace with hash 371979204, now seen corresponding path program 2 times [2021-05-02 11:51:23,894 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:23,894 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1867665733] [2021-05-02 11:51:23,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:23,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:24,026 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:24,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:24,031 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:24,031 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:24,032 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1867665733] [2021-05-02 11:51:24,032 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1867665733] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:24,032 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [331247192] [2021-05-02 11:51:24,032 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 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:51:24,061 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 11:51:24,062 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:51:24,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 11:51:24,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:51:24,066 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:24,068 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:24,073 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:24,074 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:24,087 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:24,088 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:24,089 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:24,090 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:24,091 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:24,093 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:24,094 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:24,206 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:24,235 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:24,237 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:24,242 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:24,246 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:24,250 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:24,285 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:24,286 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [331247192] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:24,286 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:51:24,286 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 20 [2021-05-02 11:51:24,286 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924643965] [2021-05-02 11:51:24,287 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 11:51:24,287 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:24,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 11:51:24,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=324, Unknown=0, NotChecked=0, Total=380 [2021-05-02 11:51:24,288 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 20 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 17 states have internal predecessors, (25), 3 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 11:51:25,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:25,154 INFO L93 Difference]: Finished difference Result 47 states and 54 transitions. [2021-05-02 11:51:25,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 11:51:25,155 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 17 states have internal predecessors, (25), 3 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 19 [2021-05-02 11:51:25,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:25,155 INFO L225 Difference]: With dead ends: 47 [2021-05-02 11:51:25,156 INFO L226 Difference]: Without dead ends: 41 [2021-05-02 11:51:25,156 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 815.6ms TimeCoverageRelationStatistics Valid=196, Invalid=994, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 11:51:25,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-02 11:51:25,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 32. [2021-05-02 11:51:25,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.2222222222222223) internal successors, (33), 27 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:25,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 37 transitions. [2021-05-02 11:51:25,161 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 37 transitions. Word has length 19 [2021-05-02 11:51:25,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:25,161 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 37 transitions. [2021-05-02 11:51:25,161 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 17 states have internal predecessors, (25), 3 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 11:51:25,161 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 37 transitions. [2021-05-02 11:51:25,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 11:51:25,161 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:25,161 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:25,377 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:51:25,378 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:25,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:25,378 INFO L82 PathProgramCache]: Analyzing trace with hash -437367422, now seen corresponding path program 1 times [2021-05-02 11:51:25,378 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:25,378 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2124665597] [2021-05-02 11:51:25,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:25,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:25,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:25,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:25,445 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:25,445 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:25,445 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2124665597] [2021-05-02 11:51:25,445 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2124665597] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:25,445 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [917349276] [2021-05-02 11:51:25,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:51:25,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:25,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 11:51:25,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:51:25,496 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:25,498 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:25,508 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:25,509 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:25,540 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:25,549 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:25,549 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [917349276] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:25,549 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:51:25,549 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 9 [2021-05-02 11:51:25,549 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [847291983] [2021-05-02 11:51:25,549 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 11:51:25,549 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:25,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 11:51:25,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=43, Unknown=0, NotChecked=0, Total=72 [2021-05-02 11:51:25,550 INFO L87 Difference]: Start difference. First operand 32 states and 37 transitions. Second operand has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 8 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:25,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:25,626 INFO L93 Difference]: Finished difference Result 41 states and 47 transitions. [2021-05-02 11:51:25,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 11:51:25,626 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 8 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-05-02 11:51:25,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:25,627 INFO L225 Difference]: With dead ends: 41 [2021-05-02 11:51:25,627 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 11:51:25,627 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 87.7ms TimeCoverageRelationStatistics Valid=53, Invalid=79, Unknown=0, NotChecked=0, Total=132 [2021-05-02 11:51:25,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 11:51:25,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-05-02 11:51:25,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 23 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:25,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2021-05-02 11:51:25,631 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 19 [2021-05-02 11:51:25,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:25,631 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2021-05-02 11:51:25,631 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 8 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:25,631 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2021-05-02 11:51:25,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 11:51:25,631 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:25,632 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:25,841 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:51:25,841 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:25,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:25,841 INFO L82 PathProgramCache]: Analyzing trace with hash 1181932733, now seen corresponding path program 2 times [2021-05-02 11:51:25,842 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:25,842 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1547133467] [2021-05-02 11:51:25,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:25,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:25,916 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:25,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:25,924 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:25,924 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:25,924 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1547133467] [2021-05-02 11:51:25,924 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1547133467] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:25,924 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [637441288] [2021-05-02 11:51:25,924 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 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:51:25,975 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 11:51:25,975 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:51:25,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 11:51:25,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:51:26,009 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:26,012 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:26,034 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:26,037 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:26,062 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:26,064 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:26,076 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:26,079 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:26,100 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:26,127 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:26,128 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [637441288] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:26,128 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:51:26,128 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 13 [2021-05-02 11:51:26,128 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [844222838] [2021-05-02 11:51:26,128 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 11:51:26,128 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:26,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 11:51:26,129 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=92, Unknown=0, NotChecked=0, Total=156 [2021-05-02 11:51:26,129 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 12 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:26,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:26,283 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2021-05-02 11:51:26,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 11:51:26,283 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 12 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-02 11:51:26,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:26,284 INFO L225 Difference]: With dead ends: 37 [2021-05-02 11:51:26,284 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 11:51:26,284 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 182.1ms TimeCoverageRelationStatistics Valid=119, Invalid=187, Unknown=0, NotChecked=0, Total=306 [2021-05-02 11:51:26,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 11:51:26,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-05-02 11:51:26,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 23 states have internal predecessors, (25), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:26,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2021-05-02 11:51:26,290 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 23 [2021-05-02 11:51:26,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:26,290 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2021-05-02 11:51:26,290 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 12 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:26,291 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2021-05-02 11:51:26,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 11:51:26,291 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:26,291 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:26,497 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:51:26,497 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:26,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:26,497 INFO L82 PathProgramCache]: Analyzing trace with hash -678101830, now seen corresponding path program 3 times [2021-05-02 11:51:26,497 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:26,497 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [602785638] [2021-05-02 11:51:26,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:26,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:26,633 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:26,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:26,644 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 11:51:26,644 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:26,644 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [602785638] [2021-05-02 11:51:26,644 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [602785638] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:26,644 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [965970205] [2021-05-02 11:51:26,644 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:51:26,685 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-02 11:51:26,685 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:51:26,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 11:51:26,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:51:26,850 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:26,874 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:26,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:26,884 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:26,886 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:26,889 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:26,917 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:26,917 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [965970205] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:26,917 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:51:26,917 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 24 [2021-05-02 11:51:26,917 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084321757] [2021-05-02 11:51:26,918 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 11:51:26,918 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:26,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 11:51:26,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=482, Unknown=0, NotChecked=0, Total=552 [2021-05-02 11:51:26,918 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand has 24 states, 22 states have (on average 1.6363636363636365) internal successors, (36), 21 states have internal predecessors, (36), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:27,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:27,851 INFO L93 Difference]: Finished difference Result 49 states and 54 transitions. [2021-05-02 11:51:27,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 11:51:27,852 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 22 states have (on average 1.6363636363636365) internal successors, (36), 21 states have internal predecessors, (36), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2021-05-02 11:51:27,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:27,853 INFO L225 Difference]: With dead ends: 49 [2021-05-02 11:51:27,853 INFO L226 Difference]: Without dead ends: 43 [2021-05-02 11:51:27,853 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 488 ImplicationChecksByTransitivity, 920.1ms TimeCoverageRelationStatistics Valid=238, Invalid=1742, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 11:51:27,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-02 11:51:27,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 29. [2021-05-02 11:51:27,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.125) internal successors, (27), 24 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:27,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2021-05-02 11:51:27,859 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 27 [2021-05-02 11:51:27,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:27,859 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2021-05-02 11:51:27,859 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 22 states have (on average 1.6363636363636365) internal successors, (36), 21 states have internal predecessors, (36), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:27,859 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2021-05-02 11:51:27,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 11:51:27,860 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:27,860 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:28,064 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 11:51:28,065 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:28,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:28,066 INFO L82 PathProgramCache]: Analyzing trace with hash -1487448456, now seen corresponding path program 3 times [2021-05-02 11:51:28,066 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:28,066 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1396317856] [2021-05-02 11:51:28,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:28,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:28,127 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:28,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:28,133 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 10 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:28,133 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:28,133 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1396317856] [2021-05-02 11:51:28,133 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1396317856] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:28,133 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [811077548] [2021-05-02 11:51:28,133 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 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:51:28,169 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-02 11:51:28,169 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:51:28,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 11:51:28,171 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:51:28,200 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:28,201 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:28,211 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:28,212 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:28,226 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:28,227 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:28,237 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:28,241 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:28,266 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:28,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:28,296 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:28,297 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:28,332 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:28,344 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 10 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:28,345 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [811077548] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:28,345 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:51:28,345 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 17 [2021-05-02 11:51:28,345 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837796808] [2021-05-02 11:51:28,345 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 11:51:28,345 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:28,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 11:51:28,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=161, Unknown=0, NotChecked=0, Total=272 [2021-05-02 11:51:28,346 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 16 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:28,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:28,565 INFO L93 Difference]: Finished difference Result 43 states and 47 transitions. [2021-05-02 11:51:28,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 11:51:28,565 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 16 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2021-05-02 11:51:28,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:28,567 INFO L225 Difference]: With dead ends: 43 [2021-05-02 11:51:28,567 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 11:51:28,568 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 228.4ms TimeCoverageRelationStatistics Valid=209, Invalid=343, Unknown=0, NotChecked=0, Total=552 [2021-05-02 11:51:28,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 11:51:28,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2021-05-02 11:51:28,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 28 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:28,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2021-05-02 11:51:28,577 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 27 [2021-05-02 11:51:28,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:28,578 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2021-05-02 11:51:28,578 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 16 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:28,578 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2021-05-02 11:51:28,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 11:51:28,579 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:28,579 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:28,792 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:51:28,793 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:28,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:28,793 INFO L82 PathProgramCache]: Analyzing trace with hash -1448969549, now seen corresponding path program 4 times [2021-05-02 11:51:28,793 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:28,793 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1034740709] [2021-05-02 11:51:28,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:28,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:28,888 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:28,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:28,898 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 13 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:28,898 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:28,898 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1034740709] [2021-05-02 11:51:28,898 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1034740709] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:28,898 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [888442763] [2021-05-02 11:51:28,898 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 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:51:28,928 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 11:51:28,928 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:51:28,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 11:51:28,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:51:28,955 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:28,956 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:28,965 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:28,966 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:28,981 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:28,982 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:28,992 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:28,993 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:29,006 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:29,007 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:29,017 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:29,018 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:29,032 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:29,033 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:29,046 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:29,047 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:29,062 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:29,069 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 13 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:29,070 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [888442763] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:29,070 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:51:29,070 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 21 [2021-05-02 11:51:29,070 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [864135019] [2021-05-02 11:51:29,070 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 11:51:29,070 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:29,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 11:51:29,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=250, Unknown=0, NotChecked=0, Total=420 [2021-05-02 11:51:29,071 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand has 21 states, 21 states have (on average 2.238095238095238) internal successors, (47), 20 states have internal predecessors, (47), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:29,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:29,345 INFO L93 Difference]: Finished difference Result 48 states and 52 transitions. [2021-05-02 11:51:29,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 11:51:29,345 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.238095238095238) internal successors, (47), 20 states have internal predecessors, (47), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2021-05-02 11:51:29,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:29,346 INFO L225 Difference]: With dead ends: 48 [2021-05-02 11:51:29,346 INFO L226 Difference]: Without dead ends: 39 [2021-05-02 11:51:29,346 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 315.4ms TimeCoverageRelationStatistics Valid=336, Invalid=594, Unknown=0, NotChecked=0, Total=930 [2021-05-02 11:51:29,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-02 11:51:29,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2021-05-02 11:51:29,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.09375) internal successors, (35), 32 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:29,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2021-05-02 11:51:29,351 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 31 [2021-05-02 11:51:29,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:29,351 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2021-05-02 11:51:29,351 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.238095238095238) internal successors, (47), 20 states have internal predecessors, (47), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:29,352 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2021-05-02 11:51:29,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 11:51:29,352 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:29,352 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:29,567 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 11:51:29,567 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:29,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:29,567 INFO L82 PathProgramCache]: Analyzing trace with hash -1929705106, now seen corresponding path program 5 times [2021-05-02 11:51:29,567 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:29,568 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [956659624] [2021-05-02 11:51:29,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:29,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 11:51:29,578 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 11:51:29,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 11:51:29,588 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 11:51:29,600 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-05-02 11:51:29,600 INFO L624 BasicCegarLoop]: Counterexample might be feasible [2021-05-02 11:51:29,600 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-05-02 11:51:29,619 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 11:51:29 BoogieIcfgContainer [2021-05-02 11:51:29,619 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 11:51:29,620 INFO L168 Benchmark]: Toolchain (without parser) took 7490.95 ms. Allocated memory was 202.4 MB in the beginning and 294.6 MB in the end (delta: 92.3 MB). Free memory was 166.4 MB in the beginning and 248.8 MB in the end (delta: -82.4 MB). Peak memory consumption was 11.8 MB. Max. memory is 8.0 GB. [2021-05-02 11:51:29,620 INFO L168 Benchmark]: CDTParser took 0.09 ms. Allocated memory is still 202.4 MB. Free memory was 182.6 MB in the beginning and 182.5 MB in the end (delta: 86.1 kB). There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 11:51:29,620 INFO L168 Benchmark]: CACSL2BoogieTranslator took 162.77 ms. Allocated memory is still 202.4 MB. Free memory was 166.2 MB in the beginning and 184.9 MB in the end (delta: -18.7 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-05-02 11:51:29,620 INFO L168 Benchmark]: Boogie Preprocessor took 16.97 ms. Allocated memory is still 202.4 MB. Free memory was 184.9 MB in the beginning and 183.3 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-05-02 11:51:29,620 INFO L168 Benchmark]: RCFGBuilder took 232.31 ms. Allocated memory is still 202.4 MB. Free memory was 183.3 MB in the beginning and 168.6 MB in the end (delta: 14.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. [2021-05-02 11:51:29,620 INFO L168 Benchmark]: TraceAbstraction took 7074.35 ms. Allocated memory was 202.4 MB in the beginning and 294.6 MB in the end (delta: 92.3 MB). Free memory was 168.1 MB in the beginning and 248.8 MB in the end (delta: -80.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. [2021-05-02 11:51:29,620 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.09 ms. Allocated memory is still 202.4 MB. Free memory was 182.6 MB in the beginning and 182.5 MB in the end (delta: 86.1 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 162.77 ms. Allocated memory is still 202.4 MB. Free memory was 166.2 MB in the beginning and 184.9 MB in the end (delta: -18.7 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 16.97 ms. Allocated memory is still 202.4 MB. Free memory was 184.9 MB in the beginning and 183.3 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 232.31 ms. Allocated memory is still 202.4 MB. Free memory was 183.3 MB in the beginning and 168.6 MB in the end (delta: 14.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 7074.35 ms. Allocated memory was 202.4 MB in the beginning and 294.6 MB in the end (delta: 92.3 MB). Free memory was 168.1 MB in the beginning and 248.8 MB in the end (delta: -80.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 16]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L23] int i, j=10, n=__VERIFIER_nondet_uint(), sn=0; [L23] int i, j=10, n=__VERIFIER_nondet_uint(), sn=0; [L24] i=1 VAL [i=1, j=10, n=0, n=6] [L24] COND TRUE i<=n VAL [i=1, j=10, n=6, n=0] [L25] COND TRUE i