/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/loop-new/nested-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 18:22:37,987 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 18:22:37,990 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 18:22:38,030 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 18:22:38,094 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 18:22:38,126 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 18:22:38,126 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 18:22:38,129 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 18:22:38,130 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 18:22:38,130 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 18:22:38,130 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 18:22:38,130 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 18:22:38,130 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 18:22:38,130 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 18:22:38,130 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 18:22:38,131 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 18:22:38,131 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 18:22:38,132 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 18:22:38,132 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 18:22:38,132 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 18:22:38,132 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 18:22:38,132 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 18:22:38,132 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 18:22:38,132 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 18:22:38,133 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 18:22:38,133 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 18:22:38,134 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 18:22:38,134 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 18:22:38,453 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 18:22:38,474 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 18:22:38,477 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 18:22:38,478 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 18:22:38,478 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 18:22:38,479 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-new/nested-1.i [2021-05-02 18:22:38,536 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d5eb1407c/da631509b13548e7874ba7e2fdefb03a/FLAG7ad5c0058 [2021-05-02 18:22:39,009 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 18:22:39,010 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/nested-1.i [2021-05-02 18:22:39,015 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d5eb1407c/da631509b13548e7874ba7e2fdefb03a/FLAG7ad5c0058 [2021-05-02 18:22:39,037 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d5eb1407c/da631509b13548e7874ba7e2fdefb03a [2021-05-02 18:22:39,039 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 18:22:39,041 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 18:22:39,044 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 18:22:39,044 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 18:22:39,047 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 18:22:39,047 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:22:39" (1/1) ... [2021-05-02 18:22:39,048 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@282a8d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:22:39, skipping insertion in model container [2021-05-02 18:22:39,048 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:22:39" (1/1) ... [2021-05-02 18:22:39,054 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 18:22:39,067 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 18:22:39,175 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-new/nested-1.i[891,904] [2021-05-02 18:22:39,185 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:22:39,192 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 18:22:39,204 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-new/nested-1.i[891,904] [2021-05-02 18:22:39,212 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:22:39,228 INFO L208 MainTranslator]: Completed translation [2021-05-02 18:22:39,228 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:22:39 WrapperNode [2021-05-02 18:22:39,229 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 18:22:39,229 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 18:22:39,230 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 18:22:39,230 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 18:22:39,248 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:22:39" (1/1) ... [2021-05-02 18:22:39,248 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:22:39" (1/1) ... [2021-05-02 18:22:39,255 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:22:39" (1/1) ... [2021-05-02 18:22:39,255 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:22:39" (1/1) ... [2021-05-02 18:22:39,275 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:22:39" (1/1) ... [2021-05-02 18:22:39,279 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:22:39" (1/1) ... [2021-05-02 18:22:39,284 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:22:39" (1/1) ... [2021-05-02 18:22:39,288 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 18:22:39,290 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 18:22:39,290 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 18:22:39,290 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 18:22:39,291 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:22:39" (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 18:22:39,357 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 18:22:39,357 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 18:22:39,357 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 18:22:39,357 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 18:22:39,357 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 18:22:39,358 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 18:22:39,358 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 18:22:39,358 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 18:22:39,358 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 18:22:39,358 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 18:22:39,358 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 18:22:39,358 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 18:22:39,359 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 18:22:39,359 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 18:22:39,359 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 18:22:39,359 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 18:22:39,359 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 18:22:39,359 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 18:22:39,360 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 18:22:39,360 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 18:22:39,361 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 18:22:39,361 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 18:22:39,642 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 18:22:39,642 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 18:22:39,643 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:22:39 BoogieIcfgContainer [2021-05-02 18:22:39,644 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 18:22:39,644 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 18:22:39,644 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 18:22:39,645 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 18:22:39,647 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:22:39" (1/1) ... [2021-05-02 18:22:39,677 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:22:39 BasicIcfg [2021-05-02 18:22:39,677 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 18:22:39,679 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 18:22:39,679 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 18:22:39,700 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 18:22:39,700 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 06:22:39" (1/4) ... [2021-05-02 18:22:39,701 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7034e450 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:22:39, skipping insertion in model container [2021-05-02 18:22:39,701 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:22:39" (2/4) ... [2021-05-02 18:22:39,701 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7034e450 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:22:39, skipping insertion in model container [2021-05-02 18:22:39,701 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:22:39" (3/4) ... [2021-05-02 18:22:39,702 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7034e450 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 06:22:39, skipping insertion in model container [2021-05-02 18:22:39,702 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:22:39" (4/4) ... [2021-05-02 18:22:39,703 INFO L111 eAbstractionObserver]: Analyzing ICFG nested-1.iJordan [2021-05-02 18:22:39,707 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 18:22:39,710 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 18:22:39,725 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 18:22:39,752 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 18:22:39,752 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 18:22:39,752 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 18:22:39,752 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 18:22:39,752 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 18:22:39,752 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 18:22:39,753 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 18:22:39,753 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 18:22:39,772 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 16 states have (on average 1.5) internal successors, (24), 17 states have internal predecessors, (24), 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 18:22:39,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-02 18:22:39,779 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:22:39,780 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:22:39,780 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:22:39,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:22:39,786 INFO L82 PathProgramCache]: Analyzing trace with hash -675886467, now seen corresponding path program 1 times [2021-05-02 18:22:39,793 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:22:39,794 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1917776380] [2021-05-02 18:22:39,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:22:39,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:39,971 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:22:39,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:39,983 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 18:22:39,984 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:22:39,984 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1917776380] [2021-05-02 18:22:39,984 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1917776380] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:22:39,985 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:22:39,985 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 18:22:39,985 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [825253363] [2021-05-02 18:22:39,989 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 18:22:39,989 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:22:40,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 18:22:40,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 18:22:40,003 INFO L87 Difference]: Start difference. First operand has 24 states, 16 states have (on average 1.5) internal successors, (24), 17 states have internal predecessors, (24), 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 3.0) internal successors, (9), 2 states have internal predecessors, (9), 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 18:22:40,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:22:40,057 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2021-05-02 18:22:40,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 18:22:40,059 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 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 13 [2021-05-02 18:22:40,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:22:40,064 INFO L225 Difference]: With dead ends: 24 [2021-05-02 18:22:40,065 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 18:22:40,066 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 26.5ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 18:22:40,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 18:22:40,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-02 18:22:40,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 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 18:22:40,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2021-05-02 18:22:40,092 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2021-05-02 18:22:40,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:22:40,092 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2021-05-02 18:22:40,093 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 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 18:22:40,093 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2021-05-02 18:22:40,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-02 18:22:40,093 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:22:40,093 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:22:40,094 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 18:22:40,094 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:22:40,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:22:40,095 INFO L82 PathProgramCache]: Analyzing trace with hash -674962946, now seen corresponding path program 1 times [2021-05-02 18:22:40,095 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:22:40,095 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1516334544] [2021-05-02 18:22:40,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:22:40,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:40,176 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:22:40,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:40,186 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 18:22:40,186 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:22:40,186 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1516334544] [2021-05-02 18:22:40,186 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1516334544] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:22:40,187 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:22:40,187 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 18:22:40,187 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [96394676] [2021-05-02 18:22:40,188 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 18:22:40,188 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:22:40,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 18:22:40,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 18:22:40,189 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 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 18:22:40,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:22:40,281 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2021-05-02 18:22:40,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 18:22:40,281 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 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 13 [2021-05-02 18:22:40,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:22:40,282 INFO L225 Difference]: With dead ends: 21 [2021-05-02 18:22:40,282 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 18:22:40,283 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 92.0ms TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-05-02 18:22:40,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 18:22:40,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2021-05-02 18:22:40,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 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 18:22:40,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2021-05-02 18:22:40,286 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2021-05-02 18:22:40,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:22:40,286 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2021-05-02 18:22:40,287 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 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 18:22:40,287 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2021-05-02 18:22:40,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-02 18:22:40,287 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:22:40,287 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:22:40,287 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 18:22:40,288 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:22:40,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:22:40,288 INFO L82 PathProgramCache]: Analyzing trace with hash 457794465, now seen corresponding path program 1 times [2021-05-02 18:22:40,288 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:22:40,289 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1673715270] [2021-05-02 18:22:40,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:22:40,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:40,343 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:22:40,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:40,351 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:22:40,351 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:22:40,351 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1673715270] [2021-05-02 18:22:40,352 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1673715270] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:22:40,352 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:22:40,352 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 18:22:40,352 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20752673] [2021-05-02 18:22:40,352 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 18:22:40,353 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:22:40,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 18:22:40,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 18:22:40,353 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (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 18:22:40,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:22:40,443 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2021-05-02 18:22:40,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 18:22:40,444 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (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 16 [2021-05-02 18:22:40,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:22:40,444 INFO L225 Difference]: With dead ends: 20 [2021-05-02 18:22:40,444 INFO L226 Difference]: Without dead ends: 20 [2021-05-02 18:22:40,445 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 68.6ms TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-05-02 18:22:40,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-02 18:22:40,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2021-05-02 18:22:40,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 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 18:22:40,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-05-02 18:22:40,448 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 16 [2021-05-02 18:22:40,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:22:40,448 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-05-02 18:22:40,448 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (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 18:22:40,448 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-05-02 18:22:40,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 18:22:40,449 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:22:40,449 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:22:40,449 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 18:22:40,449 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:22:40,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:22:40,450 INFO L82 PathProgramCache]: Analyzing trace with hash 1209290173, now seen corresponding path program 1 times [2021-05-02 18:22:40,450 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:22:40,450 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1466259085] [2021-05-02 18:22:40,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:22:40,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:40,535 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:22:40,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:40,543 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:22:40,543 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:22:40,543 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1466259085] [2021-05-02 18:22:40,543 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1466259085] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:40,544 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [459803717] [2021-05-02 18:22:40,544 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 18:22:40,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:40,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 18:22:40,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:22:40,679 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:40,689 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:40,725 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:40,739 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:22:40,740 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [459803717] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:40,740 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:22:40,740 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 8 [2021-05-02 18:22:40,740 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1613338571] [2021-05-02 18:22:40,741 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 18:22:40,741 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:22:40,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 18:22:40,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-02 18:22:40,742 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 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 18:22:40,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:22:40,855 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2021-05-02 18:22:40,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 18:22:40,856 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 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 18 [2021-05-02 18:22:40,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:22:40,856 INFO L225 Difference]: With dead ends: 22 [2021-05-02 18:22:40,856 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 18:22:40,857 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 120.8ms TimeCoverageRelationStatistics Valid=43, Invalid=67, Unknown=0, NotChecked=0, Total=110 [2021-05-02 18:22:40,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 18:22:40,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2021-05-02 18:22:40,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 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 18:22:40,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2021-05-02 18:22:40,860 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2021-05-02 18:22:40,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:22:40,860 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2021-05-02 18:22:40,861 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 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 18:22:40,861 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2021-05-02 18:22:40,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 18:22:40,861 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:22:40,861 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:22:41,080 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:22:41,081 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:22:41,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:22:41,082 INFO L82 PathProgramCache]: Analyzing trace with hash 1842159833, now seen corresponding path program 2 times [2021-05-02 18:22:41,082 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:22:41,083 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [281158971] [2021-05-02 18:22:41,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:22:41,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:41,168 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:22:41,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:41,176 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:22:41,176 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:22:41,177 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [281158971] [2021-05-02 18:22:41,177 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [281158971] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:41,177 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [646580204] [2021-05-02 18:22:41,177 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 18:22:41,234 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:22:41,234 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:22:41,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 18:22:41,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:22:41,277 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:41,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:41,311 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:41,317 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:41,336 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:41,352 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:22:41,353 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [646580204] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:41,353 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:22:41,354 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 10 [2021-05-02 18:22:41,355 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1853780480] [2021-05-02 18:22:41,357 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 18:22:41,357 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:22:41,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 18:22:41,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-05-02 18:22:41,359 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand has 10 states, 10 states have (on average 2.3) internal successors, (23), 9 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 18:22:41,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:22:41,506 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2021-05-02 18:22:41,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 18:22:41,506 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.3) internal successors, (23), 9 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 20 [2021-05-02 18:22:41,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:22:41,508 INFO L225 Difference]: With dead ends: 24 [2021-05-02 18:22:41,513 INFO L226 Difference]: Without dead ends: 24 [2021-05-02 18:22:41,513 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 159.2ms TimeCoverageRelationStatistics Valid=69, Invalid=113, Unknown=0, NotChecked=0, Total=182 [2021-05-02 18:22:41,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-02 18:22:41,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2021-05-02 18:22:41,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 states have internal predecessors, (20), 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 18:22:41,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2021-05-02 18:22:41,520 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2021-05-02 18:22:41,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:22:41,520 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2021-05-02 18:22:41,520 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.3) internal successors, (23), 9 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 18:22:41,520 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2021-05-02 18:22:41,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 18:22:41,521 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:22:41,521 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:22:41,736 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:22:41,737 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:22:41,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:22:41,737 INFO L82 PathProgramCache]: Analyzing trace with hash 144547061, now seen corresponding path program 3 times [2021-05-02 18:22:41,737 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:22:41,737 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1505472491] [2021-05-02 18:22:41,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:22:41,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:41,843 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:22:41,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:41,850 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:22:41,850 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:22:41,850 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1505472491] [2021-05-02 18:22:41,850 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1505472491] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:41,850 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [300334061] [2021-05-02 18:22:41,850 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 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 18:22:41,901 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 18:22:41,901 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:22:41,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 18:22:41,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:22:41,963 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:41,970 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:41,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:42,014 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 18:22:42,014 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [300334061] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:42,014 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:22:42,015 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5] total 11 [2021-05-02 18:22:42,015 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [550839360] [2021-05-02 18:22:42,015 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 18:22:42,015 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:22:42,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 18:22:42,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-05-02 18:22:42,016 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 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 18:22:42,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:22:42,619 INFO L93 Difference]: Finished difference Result 49 states and 52 transitions. [2021-05-02 18:22:42,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 18:22:42,620 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 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 22 [2021-05-02 18:22:42,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:22:42,624 INFO L225 Difference]: With dead ends: 49 [2021-05-02 18:22:42,624 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 18:22:42,625 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 532.9ms TimeCoverageRelationStatistics Valid=243, Invalid=459, Unknown=0, NotChecked=0, Total=702 [2021-05-02 18:22:42,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 18:22:42,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 36. [2021-05-02 18:22:42,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.096774193548387) internal successors, (34), 31 states have internal predecessors, (34), 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 18:22:42,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2021-05-02 18:22:42,638 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 22 [2021-05-02 18:22:42,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:22:42,638 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2021-05-02 18:22:42,640 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 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 18:22:42,640 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2021-05-02 18:22:42,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 18:22:42,641 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:22:42,641 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:22:42,853 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:22:42,853 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:22:42,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:22:42,853 INFO L82 PathProgramCache]: Analyzing trace with hash -1592776674, now seen corresponding path program 4 times [2021-05-02 18:22:42,854 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:22:42,854 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [997270331] [2021-05-02 18:22:42,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:22:42,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:42,959 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:22:42,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:42,978 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 43 proven. 16 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-05-02 18:22:42,978 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:22:42,979 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [997270331] [2021-05-02 18:22:42,979 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [997270331] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:42,979 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [753901159] [2021-05-02 18:22:42,979 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 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 18:22:43,030 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:22:43,030 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:22:43,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 18:22:43,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:22:43,059 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:43,061 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:43,084 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:43,090 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:43,110 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:43,119 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:43,135 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:43,137 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:43,157 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:43,191 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 43 proven. 16 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-05-02 18:22:43,191 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [753901159] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:43,191 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:22:43,191 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 14 [2021-05-02 18:22:43,192 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2044680709] [2021-05-02 18:22:43,192 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 18:22:43,192 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:22:43,194 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 18:22:43,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2021-05-02 18:22:43,194 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand has 14 states, 14 states have (on average 2.5) internal successors, (35), 13 states have internal predecessors, (35), 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 18:22:43,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:22:43,418 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2021-05-02 18:22:43,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 18:22:43,418 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.5) internal successors, (35), 13 states have internal predecessors, (35), 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 35 [2021-05-02 18:22:43,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:22:43,419 INFO L225 Difference]: With dead ends: 42 [2021-05-02 18:22:43,419 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 18:22:43,420 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 221.1ms TimeCoverageRelationStatistics Valid=139, Invalid=241, Unknown=0, NotChecked=0, Total=380 [2021-05-02 18:22:43,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 18:22:43,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2021-05-02 18:22:43,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.0857142857142856) internal successors, (38), 35 states have internal predecessors, (38), 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 18:22:43,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2021-05-02 18:22:43,423 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 35 [2021-05-02 18:22:43,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:22:43,423 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2021-05-02 18:22:43,423 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.5) internal successors, (35), 13 states have internal predecessors, (35), 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 18:22:43,423 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2021-05-02 18:22:43,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 18:22:43,424 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:22:43,424 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:22:43,632 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:22:43,634 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:22:43,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:22:43,634 INFO L82 PathProgramCache]: Analyzing trace with hash -1595810, now seen corresponding path program 5 times [2021-05-02 18:22:43,634 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:22:43,634 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1084696520] [2021-05-02 18:22:43,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:22:43,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:43,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:22:43,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:43,717 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 63 proven. 25 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-05-02 18:22:43,717 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:22:43,718 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1084696520] [2021-05-02 18:22:43,718 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1084696520] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:43,718 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1336486501] [2021-05-02 18:22:43,718 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:22:43,776 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2021-05-02 18:22:43,776 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:22:43,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 18:22:43,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:22:43,810 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:43,812 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:43,838 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:43,841 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:43,858 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:43,860 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:43,876 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:43,879 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:43,895 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:43,899 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:43,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:43,948 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 63 proven. 25 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-05-02 18:22:43,948 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1336486501] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:43,949 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:22:43,949 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 16 [2021-05-02 18:22:43,949 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1085885539] [2021-05-02 18:22:43,949 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 18:22:43,949 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:22:43,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 18:22:43,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=148, Unknown=0, NotChecked=0, Total=240 [2021-05-02 18:22:43,950 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand has 16 states, 16 states have (on average 2.4375) internal successors, (39), 15 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 18:22:44,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:22:44,156 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2021-05-02 18:22:44,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 18:22:44,156 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.4375) internal successors, (39), 15 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 39 [2021-05-02 18:22:44,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:22:44,157 INFO L225 Difference]: With dead ends: 46 [2021-05-02 18:22:44,157 INFO L226 Difference]: Without dead ends: 46 [2021-05-02 18:22:44,157 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 226.6ms TimeCoverageRelationStatistics Valid=183, Invalid=323, Unknown=0, NotChecked=0, Total=506 [2021-05-02 18:22:44,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-02 18:22:44,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 44. [2021-05-02 18:22:44,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 39 states have (on average 1.0769230769230769) internal successors, (42), 39 states have internal predecessors, (42), 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 18:22:44,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2021-05-02 18:22:44,160 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 39 [2021-05-02 18:22:44,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:22:44,160 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2021-05-02 18:22:44,160 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.4375) internal successors, (39), 15 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 18:22:44,161 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2021-05-02 18:22:44,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 18:22:44,161 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:22:44,161 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:22:44,364 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:22:44,365 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:22:44,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:22:44,379 INFO L82 PathProgramCache]: Analyzing trace with hash 1113735838, now seen corresponding path program 6 times [2021-05-02 18:22:44,379 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:22:44,379 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1155018217] [2021-05-02 18:22:44,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:22:44,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:44,470 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:22:44,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:44,475 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 87 proven. 36 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-05-02 18:22:44,475 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:22:44,475 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1155018217] [2021-05-02 18:22:44,475 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1155018217] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:44,475 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [913273314] [2021-05-02 18:22:44,476 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:22:44,523 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-02 18:22:44,524 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:22:44,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 18:22:44,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:22:44,584 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:44,586 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:44,629 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:44,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:44,650 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:44,659 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 89 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-05-02 18:22:44,659 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [913273314] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:44,660 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:22:44,660 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 6] total 15 [2021-05-02 18:22:44,660 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1617896724] [2021-05-02 18:22:44,660 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 18:22:44,660 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:22:44,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 18:22:44,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=155, Unknown=0, NotChecked=0, Total=210 [2021-05-02 18:22:44,661 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand has 15 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 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 18:22:45,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:22:45,818 INFO L93 Difference]: Finished difference Result 85 states and 89 transitions. [2021-05-02 18:22:45,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 18:22:45,818 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 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 43 [2021-05-02 18:22:45,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:22:45,819 INFO L225 Difference]: With dead ends: 85 [2021-05-02 18:22:45,819 INFO L226 Difference]: Without dead ends: 85 [2021-05-02 18:22:45,820 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 552 ImplicationChecksByTransitivity, 1068.4ms TimeCoverageRelationStatistics Valid=739, Invalid=1517, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 18:22:45,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-05-02 18:22:45,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 65. [2021-05-02 18:22:45,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 60 states have (on average 1.0666666666666667) internal successors, (64), 60 states have internal predecessors, (64), 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 18:22:45,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2021-05-02 18:22:45,824 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 43 [2021-05-02 18:22:45,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:22:45,825 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2021-05-02 18:22:45,825 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 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 18:22:45,825 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2021-05-02 18:22:45,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-02 18:22:45,826 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:22:45,826 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:22:46,028 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:22:46,029 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:22:46,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:22:46,029 INFO L82 PathProgramCache]: Analyzing trace with hash 403155077, now seen corresponding path program 7 times [2021-05-02 18:22:46,030 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:22:46,030 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [44087203] [2021-05-02 18:22:46,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:22:46,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:46,157 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:22:46,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:46,166 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 229 proven. 49 refuted. 0 times theorem prover too weak. 217 trivial. 0 not checked. [2021-05-02 18:22:46,166 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:22:46,166 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [44087203] [2021-05-02 18:22:46,166 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [44087203] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:46,166 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1260736519] [2021-05-02 18:22:46,167 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:22:46,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:46,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 18:22:46,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:22:46,264 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:46,266 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:46,284 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:46,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:46,302 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:46,303 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:46,323 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:46,326 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:46,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:46,349 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:46,366 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:46,368 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:46,389 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:46,390 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:46,409 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:46,458 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 229 proven. 49 refuted. 0 times theorem prover too weak. 217 trivial. 0 not checked. [2021-05-02 18:22:46,459 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1260736519] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:46,459 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:22:46,459 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 20 [2021-05-02 18:22:46,459 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1053880963] [2021-05-02 18:22:46,460 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 18:22:46,460 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:22:46,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 18:22:46,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=235, Unknown=0, NotChecked=0, Total=380 [2021-05-02 18:22:46,461 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand has 20 states, 20 states have (on average 2.35) internal successors, (47), 19 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 18:22:46,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:22:46,860 INFO L93 Difference]: Finished difference Result 74 states and 77 transitions. [2021-05-02 18:22:46,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 18:22:46,861 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.35) internal successors, (47), 19 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 64 [2021-05-02 18:22:46,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:22:46,861 INFO L225 Difference]: With dead ends: 74 [2021-05-02 18:22:46,861 INFO L226 Difference]: Without dead ends: 74 [2021-05-02 18:22:46,862 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 180 ImplicationChecksByTransitivity, 393.7ms TimeCoverageRelationStatistics Valid=289, Invalid=523, Unknown=0, NotChecked=0, Total=812 [2021-05-02 18:22:46,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-05-02 18:22:46,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 71. [2021-05-02 18:22:46,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 66 states have (on average 1.0606060606060606) internal successors, (70), 66 states have internal predecessors, (70), 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 18:22:46,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2021-05-02 18:22:46,867 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2021-05-02 18:22:46,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:22:46,867 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2021-05-02 18:22:46,867 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.35) internal successors, (47), 19 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 18:22:46,867 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2021-05-02 18:22:46,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-02 18:22:46,868 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:22:46,868 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:22:47,069 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 18:22:47,069 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:22:47,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:22:47,070 INFO L82 PathProgramCache]: Analyzing trace with hash -687986335, now seen corresponding path program 8 times [2021-05-02 18:22:47,070 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:22:47,070 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [471609010] [2021-05-02 18:22:47,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:22:47,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:47,216 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:22:47,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:47,220 INFO L134 CoverageAnalysis]: Checked inductivity of 636 backedges. 293 proven. 64 refuted. 0 times theorem prover too weak. 279 trivial. 0 not checked. [2021-05-02 18:22:47,221 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:22:47,221 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [471609010] [2021-05-02 18:22:47,221 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [471609010] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:47,221 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1897886798] [2021-05-02 18:22:47,221 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:22:47,299 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:22:47,299 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:22:47,300 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 18:22:47,302 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:22:47,326 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:47,327 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:47,352 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:47,354 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:47,369 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:47,374 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:47,392 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:47,393 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:47,410 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:47,413 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:47,430 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:47,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:47,456 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:47,458 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:47,479 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:47,480 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:47,500 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:47,551 INFO L134 CoverageAnalysis]: Checked inductivity of 636 backedges. 293 proven. 64 refuted. 0 times theorem prover too weak. 279 trivial. 0 not checked. [2021-05-02 18:22:47,551 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1897886798] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:47,551 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:22:47,551 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-05-02 18:22:47,552 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2098787435] [2021-05-02 18:22:47,552 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 18:22:47,553 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:22:47,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 18:22:47,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=286, Unknown=0, NotChecked=0, Total=462 [2021-05-02 18:22:47,553 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 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 18:22:47,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:22:47,855 INFO L93 Difference]: Finished difference Result 80 states and 83 transitions. [2021-05-02 18:22:47,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 18:22:47,856 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 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 70 [2021-05-02 18:22:47,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:22:47,857 INFO L225 Difference]: With dead ends: 80 [2021-05-02 18:22:47,857 INFO L226 Difference]: Without dead ends: 80 [2021-05-02 18:22:47,857 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 381.2ms TimeCoverageRelationStatistics Valid=351, Invalid=641, Unknown=0, NotChecked=0, Total=992 [2021-05-02 18:22:47,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-05-02 18:22:47,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 77. [2021-05-02 18:22:47,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 72 states have (on average 1.0555555555555556) internal successors, (76), 72 states have internal predecessors, (76), 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 18:22:47,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2021-05-02 18:22:47,860 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2021-05-02 18:22:47,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:22:47,860 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2021-05-02 18:22:47,860 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 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 18:22:47,860 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2021-05-02 18:22:47,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-02 18:22:47,861 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:22:47,861 INFO L523 BasicCegarLoop]: trace histogram [27, 27, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:22:48,081 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-05-02 18:22:48,081 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:22:48,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:22:48,082 INFO L82 PathProgramCache]: Analyzing trace with hash 1763054909, now seen corresponding path program 9 times [2021-05-02 18:22:48,082 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:22:48,082 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [142897094] [2021-05-02 18:22:48,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:22:48,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:48,222 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:22:48,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:48,227 INFO L134 CoverageAnalysis]: Checked inductivity of 795 backedges. 365 proven. 81 refuted. 0 times theorem prover too weak. 349 trivial. 0 not checked. [2021-05-02 18:22:48,227 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:22:48,227 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [142897094] [2021-05-02 18:22:48,227 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [142897094] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:48,228 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [60003418] [2021-05-02 18:22:48,228 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 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:22:48,310 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2021-05-02 18:22:48,310 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:22:48,311 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-02 18:22:48,313 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:22:48,397 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:48,399 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:48,425 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:48,427 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:48,444 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:48,446 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:48,461 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:48,464 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:48,480 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:48,481 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:48,498 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:48,499 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:48,517 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:48,518 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:48,537 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:48,539 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:48,558 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:48,560 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:48,579 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:48,586 INFO L134 CoverageAnalysis]: Checked inductivity of 795 backedges. 367 proven. 81 refuted. 0 times theorem prover too weak. 347 trivial. 0 not checked. [2021-05-02 18:22:48,586 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [60003418] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:48,586 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:22:48,586 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-05-02 18:22:48,586 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091240524] [2021-05-02 18:22:48,587 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 18:22:48,587 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:22:48,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 18:22:48,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=342, Unknown=0, NotChecked=0, Total=552 [2021-05-02 18:22:48,587 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand has 24 states, 24 states have (on average 2.5) internal successors, (60), 23 states have internal predecessors, (60), 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 18:22:48,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:22:48,931 INFO L93 Difference]: Finished difference Result 86 states and 89 transitions. [2021-05-02 18:22:48,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 18:22:48,932 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.5) internal successors, (60), 23 states have internal predecessors, (60), 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 76 [2021-05-02 18:22:48,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:22:48,932 INFO L225 Difference]: With dead ends: 86 [2021-05-02 18:22:48,932 INFO L226 Difference]: Without dead ends: 86 [2021-05-02 18:22:48,933 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 305 ImplicationChecksByTransitivity, 446.3ms TimeCoverageRelationStatistics Valid=435, Invalid=825, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 18:22:48,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-02 18:22:48,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 83. [2021-05-02 18:22:48,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 78 states have (on average 1.0512820512820513) internal successors, (82), 78 states have internal predecessors, (82), 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 18:22:48,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2021-05-02 18:22:48,939 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2021-05-02 18:22:48,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:22:48,939 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2021-05-02 18:22:48,939 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 2.5) internal successors, (60), 23 states have internal predecessors, (60), 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 18:22:48,939 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2021-05-02 18:22:48,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-02 18:22:48,940 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:22:48,940 INFO L523 BasicCegarLoop]: trace histogram [30, 30, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:22:49,147 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:22:49,147 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:22:49,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:22:49,147 INFO L82 PathProgramCache]: Analyzing trace with hash -1302189031, now seen corresponding path program 10 times [2021-05-02 18:22:49,147 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:22:49,147 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1207035403] [2021-05-02 18:22:49,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:22:49,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:49,224 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:22:49,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:49,231 INFO L134 CoverageAnalysis]: Checked inductivity of 972 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2021-05-02 18:22:49,231 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:22:49,232 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1207035403] [2021-05-02 18:22:49,232 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1207035403] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:49,232 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1087579594] [2021-05-02 18:22:49,232 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 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:22:49,289 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:22:49,290 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:22:49,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 18:22:49,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:22:49,350 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:49,351 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:49,418 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:49,420 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:49,475 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:49,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:49,492 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:49,499 INFO L134 CoverageAnalysis]: Checked inductivity of 972 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2021-05-02 18:22:49,499 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1087579594] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:49,500 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:22:49,500 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 12 [2021-05-02 18:22:49,500 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1365997807] [2021-05-02 18:22:49,500 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 18:22:49,500 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:22:49,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 18:22:49,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=81, Unknown=0, NotChecked=0, Total=132 [2021-05-02 18:22:49,501 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand has 12 states, 12 states have (on average 3.5) internal successors, (42), 11 states have internal predecessors, (42), 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 18:22:49,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:22:49,678 INFO L93 Difference]: Finished difference Result 128 states and 133 transitions. [2021-05-02 18:22:49,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 18:22:49,679 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.5) internal successors, (42), 11 states have internal predecessors, (42), 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 82 [2021-05-02 18:22:49,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:22:49,680 INFO L225 Difference]: With dead ends: 128 [2021-05-02 18:22:49,680 INFO L226 Difference]: Without dead ends: 128 [2021-05-02 18:22:49,680 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 168.9ms TimeCoverageRelationStatistics Valid=101, Invalid=171, Unknown=0, NotChecked=0, Total=272 [2021-05-02 18:22:49,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-05-02 18:22:49,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 106. [2021-05-02 18:22:49,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 101 states have (on average 1.0495049504950495) internal successors, (106), 101 states have internal predecessors, (106), 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 18:22:49,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 110 transitions. [2021-05-02 18:22:49,684 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 110 transitions. Word has length 82 [2021-05-02 18:22:49,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:22:49,685 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 110 transitions. [2021-05-02 18:22:49,685 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.5) internal successors, (42), 11 states have internal predecessors, (42), 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 18:22:49,685 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 110 transitions. [2021-05-02 18:22:49,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-05-02 18:22:49,686 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:22:49,686 INFO L523 BasicCegarLoop]: trace histogram [40, 40, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:22:49,890 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:22:49,891 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:22:49,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:22:49,891 INFO L82 PathProgramCache]: Analyzing trace with hash 1525941566, now seen corresponding path program 11 times [2021-05-02 18:22:49,891 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:22:49,891 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [519729816] [2021-05-02 18:22:49,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:22:49,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:50,001 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:22:50,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:50,008 INFO L134 CoverageAnalysis]: Checked inductivity of 1742 backedges. 0 proven. 1342 refuted. 0 times theorem prover too weak. 400 trivial. 0 not checked. [2021-05-02 18:22:50,008 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:22:50,008 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [519729816] [2021-05-02 18:22:50,008 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [519729816] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:50,008 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1547733385] [2021-05-02 18:22:50,008 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:22:50,112 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 35 check-sat command(s) [2021-05-02 18:22:50,112 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:22:50,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 18:22:50,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:22:50,179 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:50,180 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:50,243 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:50,245 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:50,295 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:50,296 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:50,348 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:50,349 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:50,362 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:50,368 INFO L134 CoverageAnalysis]: Checked inductivity of 1742 backedges. 0 proven. 1342 refuted. 0 times theorem prover too weak. 400 trivial. 0 not checked. [2021-05-02 18:22:50,369 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1547733385] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:50,369 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:22:50,369 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 14 [2021-05-02 18:22:50,369 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [955891215] [2021-05-02 18:22:50,369 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 18:22:50,369 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:22:50,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 18:22:50,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2021-05-02 18:22:50,370 INFO L87 Difference]: Start difference. First operand 106 states and 110 transitions. Second operand has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 13 states have internal predecessors, (52), 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 18:22:50,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:22:50,529 INFO L93 Difference]: Finished difference Result 151 states and 157 transitions. [2021-05-02 18:22:50,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 18:22:50,530 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 13 states have internal predecessors, (52), 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 105 [2021-05-02 18:22:50,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:22:50,530 INFO L225 Difference]: With dead ends: 151 [2021-05-02 18:22:50,530 INFO L226 Difference]: Without dead ends: 151 [2021-05-02 18:22:50,531 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 184.0ms TimeCoverageRelationStatistics Valid=139, Invalid=241, Unknown=0, NotChecked=0, Total=380 [2021-05-02 18:22:50,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-05-02 18:22:50,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 129. [2021-05-02 18:22:50,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 124 states have (on average 1.0483870967741935) internal successors, (130), 124 states have internal predecessors, (130), 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 18:22:50,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 134 transitions. [2021-05-02 18:22:50,540 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 134 transitions. Word has length 105 [2021-05-02 18:22:50,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:22:50,540 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 134 transitions. [2021-05-02 18:22:50,540 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 13 states have internal predecessors, (52), 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 18:22:50,540 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 134 transitions. [2021-05-02 18:22:50,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-05-02 18:22:50,541 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:22:50,541 INFO L523 BasicCegarLoop]: trace histogram [50, 50, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:22:50,748 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 18:22:50,749 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:22:50,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:22:50,749 INFO L82 PathProgramCache]: Analyzing trace with hash 1570222713, now seen corresponding path program 12 times [2021-05-02 18:22:50,749 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:22:50,749 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1433286990] [2021-05-02 18:22:50,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:22:50,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:50,890 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:22:50,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:50,894 INFO L134 CoverageAnalysis]: Checked inductivity of 2735 backedges. 0 proven. 2235 refuted. 0 times theorem prover too weak. 500 trivial. 0 not checked. [2021-05-02 18:22:50,894 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:22:50,894 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1433286990] [2021-05-02 18:22:50,894 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1433286990] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:50,895 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [524427838] [2021-05-02 18:22:50,895 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:22:51,016 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 46 check-sat command(s) [2021-05-02 18:22:51,016 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:22:51,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 18:22:51,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:22:51,075 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:51,076 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:51,123 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:51,125 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:51,171 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:51,173 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:51,222 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:51,223 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:51,272 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:51,274 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:51,289 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:51,296 INFO L134 CoverageAnalysis]: Checked inductivity of 2735 backedges. 0 proven. 2235 refuted. 0 times theorem prover too weak. 500 trivial. 0 not checked. [2021-05-02 18:22:51,297 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [524427838] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:51,297 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:22:51,297 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 16 [2021-05-02 18:22:51,297 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1657720548] [2021-05-02 18:22:51,298 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 18:22:51,298 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:22:51,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 18:22:51,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=148, Unknown=0, NotChecked=0, Total=240 [2021-05-02 18:22:51,298 INFO L87 Difference]: Start difference. First operand 129 states and 134 transitions. Second operand has 16 states, 16 states have (on average 3.875) internal successors, (62), 15 states have internal predecessors, (62), 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 18:22:51,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:22:51,519 INFO L93 Difference]: Finished difference Result 174 states and 181 transitions. [2021-05-02 18:22:51,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 18:22:51,519 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.875) internal successors, (62), 15 states have internal predecessors, (62), 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 128 [2021-05-02 18:22:51,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:22:51,520 INFO L225 Difference]: With dead ends: 174 [2021-05-02 18:22:51,520 INFO L226 Difference]: Without dead ends: 174 [2021-05-02 18:22:51,522 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 256.0ms TimeCoverageRelationStatistics Valid=183, Invalid=323, Unknown=0, NotChecked=0, Total=506 [2021-05-02 18:22:51,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2021-05-02 18:22:51,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 152. [2021-05-02 18:22:51,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 147 states have (on average 1.0476190476190477) internal successors, (154), 147 states have internal predecessors, (154), 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 18:22:51,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 158 transitions. [2021-05-02 18:22:51,531 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 158 transitions. Word has length 128 [2021-05-02 18:22:51,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:22:51,532 INFO L480 AbstractCegarLoop]: Abstraction has 152 states and 158 transitions. [2021-05-02 18:22:51,532 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.875) internal successors, (62), 15 states have internal predecessors, (62), 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 18:22:51,532 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 158 transitions. [2021-05-02 18:22:51,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2021-05-02 18:22:51,535 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:22:51,535 INFO L523 BasicCegarLoop]: trace histogram [60, 60, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:22:51,759 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 18:22:51,759 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:22:51,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:22:51,759 INFO L82 PathProgramCache]: Analyzing trace with hash 897405662, now seen corresponding path program 13 times [2021-05-02 18:22:51,759 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:22:51,760 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1349974940] [2021-05-02 18:22:51,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:22:51,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:51,901 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:22:51,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:51,907 INFO L134 CoverageAnalysis]: Checked inductivity of 3951 backedges. 0 proven. 3351 refuted. 0 times theorem prover too weak. 600 trivial. 0 not checked. [2021-05-02 18:22:51,908 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:22:51,908 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1349974940] [2021-05-02 18:22:51,908 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1349974940] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:51,908 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [813884753] [2021-05-02 18:22:51,908 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:22:52,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:52,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 421 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 18:22:52,021 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:22:52,077 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:52,078 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:52,126 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:52,128 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:52,173 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:52,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:52,221 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:52,222 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:52,268 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:52,270 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:52,316 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:52,317 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:52,332 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:52,339 INFO L134 CoverageAnalysis]: Checked inductivity of 3951 backedges. 0 proven. 3351 refuted. 0 times theorem prover too weak. 600 trivial. 0 not checked. [2021-05-02 18:22:52,339 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [813884753] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:52,339 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:22:52,339 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 18 [2021-05-02 18:22:52,339 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570983185] [2021-05-02 18:22:52,340 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 18:22:52,340 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:22:52,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 18:22:52,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=189, Unknown=0, NotChecked=0, Total=306 [2021-05-02 18:22:52,340 INFO L87 Difference]: Start difference. First operand 152 states and 158 transitions. Second operand has 18 states, 18 states have (on average 4.0) internal successors, (72), 17 states have internal predecessors, (72), 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 18:22:52,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:22:52,595 INFO L93 Difference]: Finished difference Result 197 states and 205 transitions. [2021-05-02 18:22:52,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 18:22:52,595 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 4.0) internal successors, (72), 17 states have internal predecessors, (72), 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 151 [2021-05-02 18:22:52,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:22:52,596 INFO L225 Difference]: With dead ends: 197 [2021-05-02 18:22:52,596 INFO L226 Difference]: Without dead ends: 197 [2021-05-02 18:22:52,597 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 290.3ms TimeCoverageRelationStatistics Valid=233, Invalid=417, Unknown=0, NotChecked=0, Total=650 [2021-05-02 18:22:52,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2021-05-02 18:22:52,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 175. [2021-05-02 18:22:52,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 170 states have (on average 1.0470588235294118) internal successors, (178), 170 states have internal predecessors, (178), 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 18:22:52,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 182 transitions. [2021-05-02 18:22:52,601 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 182 transitions. Word has length 151 [2021-05-02 18:22:52,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:22:52,601 INFO L480 AbstractCegarLoop]: Abstraction has 175 states and 182 transitions. [2021-05-02 18:22:52,601 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 4.0) internal successors, (72), 17 states have internal predecessors, (72), 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 18:22:52,601 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 182 transitions. [2021-05-02 18:22:52,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2021-05-02 18:22:52,603 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:22:52,603 INFO L523 BasicCegarLoop]: trace histogram [70, 70, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:22:52,808 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 18:22:52,809 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:22:52,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:22:52,809 INFO L82 PathProgramCache]: Analyzing trace with hash -1310650151, now seen corresponding path program 14 times [2021-05-02 18:22:52,809 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:22:52,809 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [131001585] [2021-05-02 18:22:52,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:22:52,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:52,956 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:22:52,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:52,962 INFO L134 CoverageAnalysis]: Checked inductivity of 5390 backedges. 0 proven. 4690 refuted. 0 times theorem prover too weak. 700 trivial. 0 not checked. [2021-05-02 18:22:52,962 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:22:52,962 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [131001585] [2021-05-02 18:22:52,962 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [131001585] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:52,962 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [408628062] [2021-05-02 18:22:52,962 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:22:53,091 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:22:53,092 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:22:53,094 INFO L263 TraceCheckSpWp]: Trace formula consists of 477 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 18:22:53,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:22:53,159 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:53,161 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:53,207 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:53,208 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:53,257 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:53,258 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:53,306 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:53,308 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:53,357 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:53,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:53,406 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:53,408 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:53,457 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:53,458 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:53,476 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:53,484 INFO L134 CoverageAnalysis]: Checked inductivity of 5390 backedges. 0 proven. 4690 refuted. 0 times theorem prover too weak. 700 trivial. 0 not checked. [2021-05-02 18:22:53,484 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [408628062] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:53,484 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:22:53,484 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 20 [2021-05-02 18:22:53,484 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [384647882] [2021-05-02 18:22:53,485 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 18:22:53,485 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:22:53,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 18:22:53,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=235, Unknown=0, NotChecked=0, Total=380 [2021-05-02 18:22:53,486 INFO L87 Difference]: Start difference. First operand 175 states and 182 transitions. Second operand has 20 states, 20 states have (on average 4.1) internal successors, (82), 19 states have internal predecessors, (82), 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 18:22:53,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:22:53,787 INFO L93 Difference]: Finished difference Result 220 states and 229 transitions. [2021-05-02 18:22:53,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 18:22:53,787 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 4.1) internal successors, (82), 19 states have internal predecessors, (82), 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 174 [2021-05-02 18:22:53,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:22:53,788 INFO L225 Difference]: With dead ends: 220 [2021-05-02 18:22:53,788 INFO L226 Difference]: Without dead ends: 220 [2021-05-02 18:22:53,789 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 168 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 180 ImplicationChecksByTransitivity, 343.1ms TimeCoverageRelationStatistics Valid=289, Invalid=523, Unknown=0, NotChecked=0, Total=812 [2021-05-02 18:22:53,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2021-05-02 18:22:53,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 198. [2021-05-02 18:22:53,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 198 states, 193 states have (on average 1.0466321243523315) internal successors, (202), 193 states have internal predecessors, (202), 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 18:22:53,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 206 transitions. [2021-05-02 18:22:53,793 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 206 transitions. Word has length 174 [2021-05-02 18:22:53,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:22:53,793 INFO L480 AbstractCegarLoop]: Abstraction has 198 states and 206 transitions. [2021-05-02 18:22:53,793 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 4.1) internal successors, (82), 19 states have internal predecessors, (82), 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 18:22:53,794 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 206 transitions. [2021-05-02 18:22:53,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2021-05-02 18:22:53,795 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:22:53,795 INFO L523 BasicCegarLoop]: trace histogram [80, 80, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:22:54,012 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:22:54,013 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:22:54,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:22:54,013 INFO L82 PathProgramCache]: Analyzing trace with hash 840943742, now seen corresponding path program 15 times [2021-05-02 18:22:54,013 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:22:54,013 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1349100177] [2021-05-02 18:22:54,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:22:54,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:54,188 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:22:54,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:54,194 INFO L134 CoverageAnalysis]: Checked inductivity of 7052 backedges. 0 proven. 6252 refuted. 0 times theorem prover too weak. 800 trivial. 0 not checked. [2021-05-02 18:22:54,194 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:22:54,194 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1349100177] [2021-05-02 18:22:54,194 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1349100177] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:54,194 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1156274670] [2021-05-02 18:22:54,195 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:22:54,408 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 69 check-sat command(s) [2021-05-02 18:22:54,408 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:22:54,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 533 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 18:22:54,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:22:54,471 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:54,473 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:54,520 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:54,521 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:54,569 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:54,570 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:54,619 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:54,621 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:54,667 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:54,669 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:54,717 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:54,718 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:54,772 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:54,773 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:54,822 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:54,824 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:54,844 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:54,854 INFO L134 CoverageAnalysis]: Checked inductivity of 7052 backedges. 0 proven. 6252 refuted. 0 times theorem prover too weak. 800 trivial. 0 not checked. [2021-05-02 18:22:54,854 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1156274670] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:54,854 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:22:54,854 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-05-02 18:22:54,854 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429129444] [2021-05-02 18:22:54,855 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 18:22:54,855 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:22:54,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 18:22:54,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=286, Unknown=0, NotChecked=0, Total=462 [2021-05-02 18:22:54,856 INFO L87 Difference]: Start difference. First operand 198 states and 206 transitions. Second operand has 22 states, 22 states have (on average 4.181818181818182) internal successors, (92), 21 states have internal predecessors, (92), 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 18:22:55,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:22:55,234 INFO L93 Difference]: Finished difference Result 243 states and 253 transitions. [2021-05-02 18:22:55,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 18:22:55,235 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 4.181818181818182) internal successors, (92), 21 states have internal predecessors, (92), 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 197 [2021-05-02 18:22:55,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:22:55,236 INFO L225 Difference]: With dead ends: 243 [2021-05-02 18:22:55,236 INFO L226 Difference]: Without dead ends: 243 [2021-05-02 18:22:55,237 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 414.4ms TimeCoverageRelationStatistics Valid=351, Invalid=641, Unknown=0, NotChecked=0, Total=992 [2021-05-02 18:22:55,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2021-05-02 18:22:55,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 221. [2021-05-02 18:22:55,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 221 states, 216 states have (on average 1.0462962962962963) internal successors, (226), 216 states have internal predecessors, (226), 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 18:22:55,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 221 states to 221 states and 230 transitions. [2021-05-02 18:22:55,242 INFO L78 Accepts]: Start accepts. Automaton has 221 states and 230 transitions. Word has length 197 [2021-05-02 18:22:55,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:22:55,243 INFO L480 AbstractCegarLoop]: Abstraction has 221 states and 230 transitions. [2021-05-02 18:22:55,243 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 4.181818181818182) internal successors, (92), 21 states have internal predecessors, (92), 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 18:22:55,243 INFO L276 IsEmpty]: Start isEmpty. Operand 221 states and 230 transitions. [2021-05-02 18:22:55,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 221 [2021-05-02 18:22:55,245 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:22:55,245 INFO L523 BasicCegarLoop]: trace histogram [90, 90, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:22:55,457 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 18:22:55,458 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:22:55,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:22:55,458 INFO L82 PathProgramCache]: Analyzing trace with hash -700168391, now seen corresponding path program 16 times [2021-05-02 18:22:55,458 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:22:55,458 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1153962890] [2021-05-02 18:22:55,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:22:55,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:55,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:22:55,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:22:55,665 INFO L134 CoverageAnalysis]: Checked inductivity of 8937 backedges. 0 proven. 8037 refuted. 0 times theorem prover too weak. 900 trivial. 0 not checked. [2021-05-02 18:22:55,665 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:22:55,665 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1153962890] [2021-05-02 18:22:55,666 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1153962890] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:55,666 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1967233742] [2021-05-02 18:22:55,666 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:22:55,798 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:22:55,798 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:22:55,801 INFO L263 TraceCheckSpWp]: Trace formula consists of 589 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-02 18:22:55,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:22:55,859 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:55,861 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:55,905 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:55,906 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:55,956 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:55,961 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:56,011 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:56,013 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:56,060 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:56,061 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:56,108 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:56,109 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:56,157 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:56,159 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:56,207 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:56,209 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:56,253 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:56,254 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:56,271 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:22:56,279 INFO L134 CoverageAnalysis]: Checked inductivity of 8937 backedges. 0 proven. 8037 refuted. 0 times theorem prover too weak. 900 trivial. 0 not checked. [2021-05-02 18:22:56,280 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1967233742] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:22:56,280 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:22:56,280 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2021-05-02 18:22:56,280 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [677077717] [2021-05-02 18:22:56,280 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 18:22:56,281 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:22:56,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 18:22:56,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=342, Unknown=0, NotChecked=0, Total=552 [2021-05-02 18:22:56,281 INFO L87 Difference]: Start difference. First operand 221 states and 230 transitions. Second operand has 24 states, 24 states have (on average 4.25) internal successors, (102), 23 states have internal predecessors, (102), 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 18:22:56,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:22:56,712 INFO L93 Difference]: Finished difference Result 266 states and 277 transitions. [2021-05-02 18:22:56,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 18:22:56,713 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 4.25) internal successors, (102), 23 states have internal predecessors, (102), 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 220 [2021-05-02 18:22:56,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:22:56,714 INFO L225 Difference]: With dead ends: 266 [2021-05-02 18:22:56,714 INFO L226 Difference]: Without dead ends: 266 [2021-05-02 18:22:56,715 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 212 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 305 ImplicationChecksByTransitivity, 498.6ms TimeCoverageRelationStatistics Valid=435, Invalid=825, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 18:22:56,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2021-05-02 18:22:56,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 244. [2021-05-02 18:22:56,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 244 states, 239 states have (on average 1.0460251046025104) internal successors, (250), 239 states have internal predecessors, (250), 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 18:22:56,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 254 transitions. [2021-05-02 18:22:56,719 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 254 transitions. Word has length 220 [2021-05-02 18:22:56,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:22:56,719 INFO L480 AbstractCegarLoop]: Abstraction has 244 states and 254 transitions. [2021-05-02 18:22:56,719 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 4.25) internal successors, (102), 23 states have internal predecessors, (102), 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 18:22:56,719 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 254 transitions. [2021-05-02 18:22:56,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2021-05-02 18:22:56,721 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:22:56,721 INFO L523 BasicCegarLoop]: trace histogram [100, 100, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:22:56,943 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:22:56,944 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:22:56,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:22:56,944 INFO L82 PathProgramCache]: Analyzing trace with hash -1558878690, now seen corresponding path program 17 times [2021-05-02 18:22:56,944 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:22:56,944 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1180417220] [2021-05-02 18:22:56,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:22:57,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:01,153 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:23:01,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:23:01,163 INFO L134 CoverageAnalysis]: Checked inductivity of 11045 backedges. 10917 proven. 119 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 18:23:01,163 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:23:01,163 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1180417220] [2021-05-02 18:23:01,163 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1180417220] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:23:01,163 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [622400460] [2021-05-02 18:23:01,164 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:01,385 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 81 check-sat command(s) [2021-05-02 18:23:01,386 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:23:01,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 645 conjuncts, 107 conjunts are in the unsatisfiable core [2021-05-02 18:23:01,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:23:01,411 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,413 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,416 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,417 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,423 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,424 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,427 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,428 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,431 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,435 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,437 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,440 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,441 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,445 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,447 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,450 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,451 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,458 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,460 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,467 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,469 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,472 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,473 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,478 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,481 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,483 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,486 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,487 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,492 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,493 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,497 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,501 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,505 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,506 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,510 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,511 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,514 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,515 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,522 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,523 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,527 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,528 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,531 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,532 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,535 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,536 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,540 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,541 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,544 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,545 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,548 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,550 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,553 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,554 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,558 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,559 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,561 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,565 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,573 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,574 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,579 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,580 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,585 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,588 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,589 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,593 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,594 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,597 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,599 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,602 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,603 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,607 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,608 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,611 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,612 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,620 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,621 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,629 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,631 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,634 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,636 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,642 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,643 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,646 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,647 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,651 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,652 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,656 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,657 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,660 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,661 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,665 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,666 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,670 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,671 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,674 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,675 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,683 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,684 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,689 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,692 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,694 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,697 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,698 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,702 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,703 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,706 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,707 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,711 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,712 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,718 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,719 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,722 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,724 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,727 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,728 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,736 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,737 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,742 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,745 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,747 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,750 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,751 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,755 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,757 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,760 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,761 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,765 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,766 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,778 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,779 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,783 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,784 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,789 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,796 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,798 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,802 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,803 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,807 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,808 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,811 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,812 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,816 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,817 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,821 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,822 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,826 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,827 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,830 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,831 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,839 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,840 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,847 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,848 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,855 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,856 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,860 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,861 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,864 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,865 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,869 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,870 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,874 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,878 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,879 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,883 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,884 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,887 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,888 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,892 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,893 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,896 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,898 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,905 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,906 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,910 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,911 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,914 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,915 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,919 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,923 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,924 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,929 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,930 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,934 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,935 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,940 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,941 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,945 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,946 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,949 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,951 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,959 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:01,961 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:23:02,068 INFO L134 CoverageAnalysis]: Checked inductivity of 11045 backedges. 11036 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 18:23:02,069 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [622400460] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:23:02,069 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 18:23:02,069 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [105] imperfect sequences [106] total 109 [2021-05-02 18:23:02,069 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1219407927] [2021-05-02 18:23:02,069 INFO L460 AbstractCegarLoop]: Interpolant automaton has 105 states [2021-05-02 18:23:02,069 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:23:02,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2021-05-02 18:23:02,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5268, Invalid=6504, Unknown=0, NotChecked=0, Total=11772 [2021-05-02 18:23:02,073 INFO L87 Difference]: Start difference. First operand 244 states and 254 transitions. Second operand has 105 states, 105 states have (on average 2.276190476190476) internal successors, (239), 104 states have internal predecessors, (239), 2 states have call successors, (3), 2 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 18:23:02,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:23:02,659 INFO L93 Difference]: Finished difference Result 9782 states and 10242 transitions. [2021-05-02 18:23:02,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2021-05-02 18:23:02,660 INFO L78 Accepts]: Start accepts. Automaton has has 105 states, 105 states have (on average 2.276190476190476) internal successors, (239), 104 states have internal predecessors, (239), 2 states have call successors, (3), 2 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 243 [2021-05-02 18:23:02,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:23:02,660 INFO L225 Difference]: With dead ends: 9782 [2021-05-02 18:23:02,661 INFO L226 Difference]: Without dead ends: 0 [2021-05-02 18:23:02,663 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 242 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 795 ImplicationChecksByTransitivity, 4119.1ms TimeCoverageRelationStatistics Valid=5274, Invalid=6716, Unknown=0, NotChecked=0, Total=11990 [2021-05-02 18:23:02,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-02 18:23:02,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-02 18:23:02,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-02 18:23:02,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-02 18:23:02,663 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 243 [2021-05-02 18:23:02,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:23:02,664 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-02 18:23:02,664 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 105 states, 105 states have (on average 2.276190476190476) internal successors, (239), 104 states have internal predecessors, (239), 2 states have call successors, (3), 2 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 18:23:02,664 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-02 18:23:02,664 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-02 18:23:02,880 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:23:02,886 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 06:23:02 BasicIcfg [2021-05-02 18:23:02,886 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 18:23:02,886 INFO L168 Benchmark]: Toolchain (without parser) took 23845.48 ms. Allocated memory was 201.3 MB in the beginning and 421.5 MB in the end (delta: 220.2 MB). Free memory was 166.8 MB in the beginning and 247.0 MB in the end (delta: -80.2 MB). Peak memory consumption was 141.6 MB. Max. memory is 8.0 GB. [2021-05-02 18:23:02,886 INFO L168 Benchmark]: CDTParser took 0.12 ms. Allocated memory is still 201.3 MB. Free memory is still 183.4 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 18:23:02,887 INFO L168 Benchmark]: CACSL2BoogieTranslator took 185.23 ms. Allocated memory is still 201.3 MB. Free memory was 166.5 MB in the beginning and 156.9 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-05-02 18:23:02,887 INFO L168 Benchmark]: Boogie Preprocessor took 58.86 ms. Allocated memory is still 201.3 MB. Free memory was 156.8 MB in the beginning and 185.0 MB in the end (delta: -28.2 MB). Peak memory consumption was 3.3 MB. Max. memory is 8.0 GB. [2021-05-02 18:23:02,887 INFO L168 Benchmark]: RCFGBuilder took 354.13 ms. Allocated memory is still 201.3 MB. Free memory was 184.6 MB in the beginning and 169.7 MB in the end (delta: 15.0 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. [2021-05-02 18:23:02,887 INFO L168 Benchmark]: IcfgTransformer took 33.26 ms. Allocated memory is still 201.3 MB. Free memory was 169.7 MB in the beginning and 168.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-02 18:23:02,887 INFO L168 Benchmark]: TraceAbstraction took 23207.09 ms. Allocated memory was 201.3 MB in the beginning and 421.5 MB in the end (delta: 220.2 MB). Free memory was 167.9 MB in the beginning and 247.0 MB in the end (delta: -79.2 MB). Peak memory consumption was 142.5 MB. Max. memory is 8.0 GB. [2021-05-02 18:23:02,887 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.12 ms. Allocated memory is still 201.3 MB. Free memory is still 183.4 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 185.23 ms. Allocated memory is still 201.3 MB. Free memory was 166.5 MB in the beginning and 156.9 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 58.86 ms. Allocated memory is still 201.3 MB. Free memory was 156.8 MB in the beginning and 185.0 MB in the end (delta: -28.2 MB). Peak memory consumption was 3.3 MB. Max. memory is 8.0 GB. * RCFGBuilder took 354.13 ms. Allocated memory is still 201.3 MB. Free memory was 184.6 MB in the beginning and 169.7 MB in the end (delta: 15.0 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. * IcfgTransformer took 33.26 ms. Allocated memory is still 201.3 MB. Free memory was 169.7 MB in the beginning and 168.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * TraceAbstraction took 23207.09 ms. Allocated memory was 201.3 MB in the beginning and 421.5 MB in the end (delta: 220.2 MB). Free memory was 167.9 MB in the beginning and 247.0 MB in the end (delta: -79.2 MB). Peak memory consumption was 142.5 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 19]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 23131.2ms, OverallIterations: 20, TraceHistogramMax: 100, EmptinessCheckTime: 35.8ms, AutomataDifference: 6320.1ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 11.8ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 655 SDtfs, 1643 SDslu, 1900 SDs, 0 SdLazy, 2061 SolverSat, 437 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1512.2ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 2138 GetRequests, 1628 SyntacticMatches, 0 SemanticMatches, 510 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3434 ImplicationChecksByTransitivity, 10012.6ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=244occurred in iteration=19, InterpolantAutomatonStates: 323, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 104.8ms AutomataMinimizationTime, 20 MinimizatonAttempts, 206 StatesRemovedByMinimization, 18 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 396.0ms SsaConstructionTime, 1297.9ms SatisfiabilityAnalysisTime, 10667.8ms InterpolantComputationTime, 3416 NumberOfCodeBlocks, 3365 NumberOfCodeBlocksAsserted, 305 NumberOfCheckSat, 3379 ConstructedInterpolants, 0 QuantifiedInterpolants, 16173 SizeOfPredicates, 33 NumberOfNonLiveVariables, 4879 ConjunctsInSsa, 236 ConjunctsInUnsatCore, 37 InterpolantComputations, 4 PerfectInterpolantSequences, 34349/88241 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! Received shutdown request...