/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-acceleration/diamond_2-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 17:52:05,548 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 17:52:05,550 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 17:52:05,580 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 17:52:05,581 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 17:52:05,583 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 17:52:05,585 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 17:52:05,588 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 17:52:05,590 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 17:52:05,594 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 17:52:05,594 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 17:52:05,595 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 17:52:05,595 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 17:52:05,597 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 17:52:05,598 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 17:52:05,599 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 17:52:05,601 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 17:52:05,602 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 17:52:05,603 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 17:52:05,608 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 17:52:05,609 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 17:52:05,610 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 17:52:05,612 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 17:52:05,613 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 17:52:05,614 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 17:52:05,618 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 17:52:05,619 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 17:52:05,619 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 17:52:05,625 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 17:52:05,638 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 17:52:05,639 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 17:52:05,641 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 17:52:05,641 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 17:52:05,641 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 17:52:05,641 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 17:52:05,641 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 17:52:05,641 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 17:52:05,641 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 17:52:05,641 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 17:52:05,642 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 17:52:05,642 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 17:52:05,642 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 17:52:05,642 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 17:52:05,643 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 17:52:05,643 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 17:52:05,643 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 17:52:05,643 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 17:52:05,643 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 17:52:05,643 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 17:52:05,643 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 17:52:05,644 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 17:52:05,644 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 17:52:05,910 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 17:52:05,928 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 17:52:05,930 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 17:52:05,930 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 17:52:05,931 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 17:52:05,931 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/diamond_2-2.c [2021-05-02 17:52:05,976 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/476b99564/a3a59adf04894210953e0b201f2f6bdf/FLAG5560e4dac [2021-05-02 17:52:06,325 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 17:52:06,325 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/diamond_2-2.c [2021-05-02 17:52:06,330 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/476b99564/a3a59adf04894210953e0b201f2f6bdf/FLAG5560e4dac [2021-05-02 17:52:06,340 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/476b99564/a3a59adf04894210953e0b201f2f6bdf [2021-05-02 17:52:06,342 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 17:52:06,343 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 17:52:06,345 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 17:52:06,345 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 17:52:06,347 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 17:52:06,348 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:52:06" (1/1) ... [2021-05-02 17:52:06,348 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3f6ae272 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:52:06, skipping insertion in model container [2021-05-02 17:52:06,348 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:52:06" (1/1) ... [2021-05-02 17:52:06,352 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 17:52:06,362 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 17:52:06,449 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-acceleration/diamond_2-2.c[373,386] [2021-05-02 17:52:06,461 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:52:06,466 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 17:52:06,473 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-acceleration/diamond_2-2.c[373,386] [2021-05-02 17:52:06,479 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:52:06,487 INFO L208 MainTranslator]: Completed translation [2021-05-02 17:52:06,487 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:52:06 WrapperNode [2021-05-02 17:52:06,487 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 17:52:06,488 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 17:52:06,488 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 17:52:06,488 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 17:52:06,497 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:52:06" (1/1) ... [2021-05-02 17:52:06,497 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:52:06" (1/1) ... [2021-05-02 17:52:06,544 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:52:06" (1/1) ... [2021-05-02 17:52:06,544 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:52:06" (1/1) ... [2021-05-02 17:52:06,547 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:52:06" (1/1) ... [2021-05-02 17:52:06,556 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:52:06" (1/1) ... [2021-05-02 17:52:06,559 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:52:06" (1/1) ... [2021-05-02 17:52:06,560 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 17:52:06,561 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 17:52:06,561 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 17:52:06,561 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 17:52:06,564 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:52:06" (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 17:52:06,627 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 17:52:06,627 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 17:52:06,627 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 17:52:06,627 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 17:52:06,627 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 17:52:06,628 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 17:52:06,628 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 17:52:06,628 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 17:52:06,628 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 17:52:06,628 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2021-05-02 17:52:06,628 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 17:52:06,629 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 17:52:06,629 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 17:52:06,629 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 17:52:06,629 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 17:52:06,629 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 17:52:06,629 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 17:52:06,630 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 17:52:06,912 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 17:52:06,912 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 17:52:06,913 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:52:06 BoogieIcfgContainer [2021-05-02 17:52:06,914 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 17:52:06,914 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 17:52:06,914 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 17:52:06,915 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 17:52:06,916 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:52:06" (1/1) ... [2021-05-02 17:52:06,936 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 05:52:06 BasicIcfg [2021-05-02 17:52:06,937 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 17:52:06,938 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 17:52:06,938 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 17:52:06,940 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 17:52:06,941 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 05:52:06" (1/4) ... [2021-05-02 17:52:06,942 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@162c0975 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:52:06, skipping insertion in model container [2021-05-02 17:52:06,943 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:52:06" (2/4) ... [2021-05-02 17:52:06,943 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@162c0975 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:52:06, skipping insertion in model container [2021-05-02 17:52:06,943 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:52:06" (3/4) ... [2021-05-02 17:52:06,944 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@162c0975 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 05:52:06, skipping insertion in model container [2021-05-02 17:52:06,944 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 05:52:06" (4/4) ... [2021-05-02 17:52:06,945 INFO L111 eAbstractionObserver]: Analyzing ICFG diamond_2-2.cJordan [2021-05-02 17:52:06,949 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 17:52:06,952 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 17:52:06,962 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 17:52:06,980 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 17:52:06,980 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 17:52:06,980 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 17:52:06,980 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 17:52:06,980 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 17:52:06,980 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 17:52:06,980 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 17:52:06,980 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 17:52:06,991 INFO L276 IsEmpty]: Start isEmpty. Operand has 28 states, 20 states have (on average 1.7) internal successors, (34), 21 states have internal predecessors, (34), 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 17:52:06,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 17:52:06,999 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:07,000 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:07,000 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:07,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:07,004 INFO L82 PathProgramCache]: Analyzing trace with hash -935980469, now seen corresponding path program 1 times [2021-05-02 17:52:07,009 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:07,009 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1701717610] [2021-05-02 17:52:07,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:07,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:07,181 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:07,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:07,190 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 17:52:07,191 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:07,191 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1701717610] [2021-05-02 17:52:07,191 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1701717610] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:52:07,192 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:52:07,192 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 17:52:07,192 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351159366] [2021-05-02 17:52:07,195 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 17:52:07,195 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:07,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 17:52:07,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:52:07,204 INFO L87 Difference]: Start difference. First operand has 28 states, 20 states have (on average 1.7) internal successors, (34), 21 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:07,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:07,230 INFO L93 Difference]: Finished difference Result 28 states and 38 transitions. [2021-05-02 17:52:07,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 17:52:07,232 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 17:52:07,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:07,236 INFO L225 Difference]: With dead ends: 28 [2021-05-02 17:52:07,236 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 17:52:07,237 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 40.6ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:52:07,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 17:52:07,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-05-02 17:52:07,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 17 states have internal predecessors, (28), 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 17:52:07,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 32 transitions. [2021-05-02 17:52:07,255 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 32 transitions. Word has length 11 [2021-05-02 17:52:07,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:07,255 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 32 transitions. [2021-05-02 17:52:07,256 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:07,256 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 32 transitions. [2021-05-02 17:52:07,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 17:52:07,256 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:07,256 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:07,256 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 17:52:07,257 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:07,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:07,257 INFO L82 PathProgramCache]: Analyzing trace with hash -935056948, now seen corresponding path program 1 times [2021-05-02 17:52:07,257 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:07,257 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [692601395] [2021-05-02 17:52:07,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:07,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:07,320 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:07,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:07,328 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 17:52:07,328 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:07,328 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [692601395] [2021-05-02 17:52:07,328 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [692601395] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:52:07,328 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:52:07,328 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 17:52:07,328 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1242436304] [2021-05-02 17:52:07,329 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 17:52:07,329 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:07,330 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 17:52:07,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 17:52:07,330 INFO L87 Difference]: Start difference. First operand 22 states and 32 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:07,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:07,401 INFO L93 Difference]: Finished difference Result 24 states and 35 transitions. [2021-05-02 17:52:07,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 17:52:07,402 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 17:52:07,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:07,404 INFO L225 Difference]: With dead ends: 24 [2021-05-02 17:52:07,404 INFO L226 Difference]: Without dead ends: 24 [2021-05-02 17:52:07,404 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 42.3ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 17:52:07,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-02 17:52:07,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2021-05-02 17:52:07,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 18 states have internal predecessors, (29), 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 17:52:07,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 33 transitions. [2021-05-02 17:52:07,411 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 33 transitions. Word has length 11 [2021-05-02 17:52:07,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:07,412 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 33 transitions. [2021-05-02 17:52:07,412 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:07,412 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 33 transitions. [2021-05-02 17:52:07,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 17:52:07,412 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:07,413 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:07,413 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 17:52:07,413 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:07,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:07,414 INFO L82 PathProgramCache]: Analyzing trace with hash 982716702, now seen corresponding path program 1 times [2021-05-02 17:52:07,415 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:07,415 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1685373486] [2021-05-02 17:52:07,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:07,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:07,655 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:07,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:07,679 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:07,679 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:07,680 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1685373486] [2021-05-02 17:52:07,680 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1685373486] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:07,680 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1630381207] [2021-05-02 17:52:07,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 17:52:07,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:07,737 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 17:52:07,740 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:07,852 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:07,868 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:07,868 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1630381207] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:07,869 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:07,869 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2021-05-02 17:52:07,869 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1880616571] [2021-05-02 17:52:07,870 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 17:52:07,870 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:07,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 17:52:07,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-05-02 17:52:07,872 INFO L87 Difference]: Start difference. First operand 23 states and 33 transitions. Second operand has 15 states, 15 states have (on average 1.4) internal successors, (21), 14 states have internal predecessors, (21), 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 17:52:09,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:09,560 INFO L93 Difference]: Finished difference Result 139 states and 254 transitions. [2021-05-02 17:52:09,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 17:52:09,561 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.4) internal successors, (21), 14 states have internal predecessors, (21), 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 17:52:09,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:09,562 INFO L225 Difference]: With dead ends: 139 [2021-05-02 17:52:09,562 INFO L226 Difference]: Without dead ends: 139 [2021-05-02 17:52:09,563 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 470.2ms TimeCoverageRelationStatistics Valid=108, Invalid=594, Unknown=0, NotChecked=0, Total=702 [2021-05-02 17:52:09,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-05-02 17:52:09,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 131. [2021-05-02 17:52:09,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 126 states have (on average 1.8650793650793651) internal successors, (235), 126 states have internal predecessors, (235), 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 17:52:09,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 239 transitions. [2021-05-02 17:52:09,571 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 239 transitions. Word has length 22 [2021-05-02 17:52:09,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:09,571 INFO L480 AbstractCegarLoop]: Abstraction has 131 states and 239 transitions. [2021-05-02 17:52:09,572 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.4) internal successors, (21), 14 states have internal predecessors, (21), 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 17:52:09,572 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 239 transitions. [2021-05-02 17:52:09,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 17:52:09,572 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:09,573 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:09,788 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 17:52:09,788 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:09,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:09,789 INFO L82 PathProgramCache]: Analyzing trace with hash -824737761, now seen corresponding path program 1 times [2021-05-02 17:52:09,789 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:09,789 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1187593198] [2021-05-02 17:52:09,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:09,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:09,840 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:09,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:09,861 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 17:52:09,861 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:09,861 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1187593198] [2021-05-02 17:52:09,861 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1187593198] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:52:09,861 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:52:09,861 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 17:52:09,861 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [660701792] [2021-05-02 17:52:09,862 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 17:52:09,862 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:09,862 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 17:52:09,862 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 17:52:09,862 INFO L87 Difference]: Start difference. First operand 131 states and 239 transitions. Second operand has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 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 17:52:09,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:09,936 INFO L93 Difference]: Finished difference Result 46 states and 58 transitions. [2021-05-02 17:52:09,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 17:52:09,937 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 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 22 [2021-05-02 17:52:09,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:09,938 INFO L225 Difference]: With dead ends: 46 [2021-05-02 17:52:09,938 INFO L226 Difference]: Without dead ends: 46 [2021-05-02 17:52:09,938 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 28.3ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 17:52:09,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-02 17:52:09,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2021-05-02 17:52:09,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.325) internal successors, (53), 40 states have internal predecessors, (53), 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 17:52:09,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 57 transitions. [2021-05-02 17:52:09,941 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 57 transitions. Word has length 22 [2021-05-02 17:52:09,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:09,941 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 57 transitions. [2021-05-02 17:52:09,941 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 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 17:52:09,941 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 57 transitions. [2021-05-02 17:52:09,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 17:52:09,942 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:09,942 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:09,942 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 17:52:09,942 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:09,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:09,942 INFO L82 PathProgramCache]: Analyzing trace with hash -1804698785, now seen corresponding path program 1 times [2021-05-02 17:52:09,942 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:09,942 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1985620957] [2021-05-02 17:52:09,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:09,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:09,969 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:09,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:09,973 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 17:52:09,973 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:09,973 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1985620957] [2021-05-02 17:52:09,973 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1985620957] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:52:09,973 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:52:09,973 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 17:52:09,973 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [125758438] [2021-05-02 17:52:09,973 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 17:52:09,974 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:09,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 17:52:09,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 17:52:09,974 INFO L87 Difference]: Start difference. First operand 45 states and 57 transitions. Second operand has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 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 17:52:10,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:10,055 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2021-05-02 17:52:10,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 17:52:10,055 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 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 22 [2021-05-02 17:52:10,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:10,056 INFO L225 Difference]: With dead ends: 46 [2021-05-02 17:52:10,056 INFO L226 Difference]: Without dead ends: 46 [2021-05-02 17:52:10,056 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 29.8ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 17:52:10,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-02 17:52:10,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2021-05-02 17:52:10,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.075) internal successors, (43), 40 states have internal predecessors, (43), 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 17:52:10,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2021-05-02 17:52:10,058 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 22 [2021-05-02 17:52:10,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:10,058 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2021-05-02 17:52:10,059 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 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 17:52:10,059 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2021-05-02 17:52:10,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 17:52:10,059 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:10,059 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:10,059 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-02 17:52:10,059 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:10,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:10,060 INFO L82 PathProgramCache]: Analyzing trace with hash 678413438, now seen corresponding path program 1 times [2021-05-02 17:52:10,060 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:10,060 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1611354701] [2021-05-02 17:52:10,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:10,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:10,175 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:10,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:10,181 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:10,181 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:10,181 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1611354701] [2021-05-02 17:52:10,181 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1611354701] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:10,181 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1387495832] [2021-05-02 17:52:10,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:10,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:10,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 17:52:10,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:10,354 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:10,371 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:10,378 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:10,407 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:10,408 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1387495832] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:10,408 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:10,408 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 10] total 14 [2021-05-02 17:52:10,408 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [411007046] [2021-05-02 17:52:10,408 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 17:52:10,408 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:10,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 17:52:10,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2021-05-02 17:52:10,409 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 11 states have internal predecessors, (32), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:10,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:10,692 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2021-05-02 17:52:10,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 17:52:10,692 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 11 states have internal predecessors, (32), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2021-05-02 17:52:10,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:10,692 INFO L225 Difference]: With dead ends: 47 [2021-05-02 17:52:10,692 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 17:52:10,693 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 19 SyntacticMatches, 7 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 291.4ms TimeCoverageRelationStatistics Valid=74, Invalid=388, Unknown=0, NotChecked=0, Total=462 [2021-05-02 17:52:10,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 17:52:10,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-02 17:52:10,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.0344827586206897) internal successors, (30), 29 states have internal predecessors, (30), 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 17:52:10,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2021-05-02 17:52:10,695 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 22 [2021-05-02 17:52:10,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:10,695 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2021-05-02 17:52:10,695 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 11 states have internal predecessors, (32), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:10,695 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2021-05-02 17:52:10,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 17:52:10,695 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:10,695 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:10,911 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:10,911 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:10,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:10,912 INFO L82 PathProgramCache]: Analyzing trace with hash -1364934004, now seen corresponding path program 2 times [2021-05-02 17:52:10,912 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:10,912 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [732790844] [2021-05-02 17:52:10,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:10,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:11,269 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:11,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:11,275 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:11,275 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:11,275 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [732790844] [2021-05-02 17:52:11,275 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [732790844] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:11,275 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1146275360] [2021-05-02 17:52:11,276 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:11,329 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:52:11,329 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:11,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 17:52:11,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:11,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:11,442 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:11,442 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1146275360] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:11,442 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:11,443 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-02 17:52:11,443 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1139313906] [2021-05-02 17:52:11,443 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 17:52:11,443 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:11,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 17:52:11,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2021-05-02 17:52:11,444 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand has 25 states, 25 states have (on average 1.28) internal successors, (32), 24 states have internal predecessors, (32), 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 17:52:12,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:12,303 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2021-05-02 17:52:12,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 17:52:12,303 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.28) internal successors, (32), 24 states have internal predecessors, (32), 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 33 [2021-05-02 17:52:12,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:12,304 INFO L225 Difference]: With dead ends: 46 [2021-05-02 17:52:12,304 INFO L226 Difference]: Without dead ends: 46 [2021-05-02 17:52:12,304 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 874.4ms TimeCoverageRelationStatistics Valid=173, Invalid=1897, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 17:52:12,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-02 17:52:12,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2021-05-02 17:52:12,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.025) internal successors, (41), 40 states have internal predecessors, (41), 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 17:52:12,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2021-05-02 17:52:12,306 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 33 [2021-05-02 17:52:12,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:12,307 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2021-05-02 17:52:12,307 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.28) internal successors, (32), 24 states have internal predecessors, (32), 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 17:52:12,307 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2021-05-02 17:52:12,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 17:52:12,307 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:12,307 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:12,512 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:12,513 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:12,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:12,514 INFO L82 PathProgramCache]: Analyzing trace with hash -677412770, now seen corresponding path program 3 times [2021-05-02 17:52:12,514 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:12,514 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1289468979] [2021-05-02 17:52:12,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:12,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:13,085 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:13,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:13,093 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:13,093 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:13,093 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1289468979] [2021-05-02 17:52:13,094 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1289468979] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:13,094 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [266145438] [2021-05-02 17:52:13,094 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 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 17:52:13,181 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 17:52:13,181 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:13,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 63 conjunts are in the unsatisfiable core [2021-05-02 17:52:13,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:13,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:13,297 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:13,298 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [266145438] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:13,298 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:13,298 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2021-05-02 17:52:13,298 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1162722969] [2021-05-02 17:52:13,299 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 17:52:13,299 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:13,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 17:52:13,300 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 17:52:13,301 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand has 35 states, 35 states have (on average 1.2285714285714286) internal successors, (43), 34 states have internal predecessors, (43), 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 17:52:14,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:14,818 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2021-05-02 17:52:14,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 17:52:14,818 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.2285714285714286) internal successors, (43), 34 states have internal predecessors, (43), 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 44 [2021-05-02 17:52:14,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:14,819 INFO L225 Difference]: With dead ends: 57 [2021-05-02 17:52:14,819 INFO L226 Difference]: Without dead ends: 57 [2021-05-02 17:52:14,820 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 469 ImplicationChecksByTransitivity, 1496.3ms TimeCoverageRelationStatistics Valid=253, Invalid=4037, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 17:52:14,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-02 17:52:14,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2021-05-02 17:52:14,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 51 states have (on average 1.0196078431372548) internal successors, (52), 51 states have internal predecessors, (52), 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 17:52:14,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2021-05-02 17:52:14,822 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 44 [2021-05-02 17:52:14,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:14,823 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2021-05-02 17:52:14,823 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 1.2285714285714286) internal successors, (43), 34 states have internal predecessors, (43), 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 17:52:14,823 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2021-05-02 17:52:14,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 17:52:14,823 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:14,823 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:15,032 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:15,033 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:15,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:15,033 INFO L82 PathProgramCache]: Analyzing trace with hash -1523168436, now seen corresponding path program 4 times [2021-05-02 17:52:15,034 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:15,034 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [570494492] [2021-05-02 17:52:15,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:15,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:15,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:15,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:15,957 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:15,957 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:15,957 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [570494492] [2021-05-02 17:52:15,957 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [570494492] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:15,957 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [156324621] [2021-05-02 17:52:15,957 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 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 17:52:16,011 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:52:16,011 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:16,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 89 conjunts are in the unsatisfiable core [2021-05-02 17:52:16,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:17,905 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:17,911 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:17,913 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:18,012 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:18,012 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [156324621] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:18,012 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:18,012 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 45] total 86 [2021-05-02 17:52:18,012 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2135757030] [2021-05-02 17:52:18,013 INFO L460 AbstractCegarLoop]: Interpolant automaton has 86 states [2021-05-02 17:52:18,013 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:18,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2021-05-02 17:52:18,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=288, Invalid=7022, Unknown=0, NotChecked=0, Total=7310 [2021-05-02 17:52:18,015 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand has 86 states, 86 states have (on average 1.1395348837209303) internal successors, (98), 84 states have internal predecessors, (98), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:20,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:20,786 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2021-05-02 17:52:20,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-02 17:52:20,786 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 86 states have (on average 1.1395348837209303) internal successors, (98), 84 states have internal predecessors, (98), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2021-05-02 17:52:20,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:20,787 INFO L225 Difference]: With dead ends: 68 [2021-05-02 17:52:20,787 INFO L226 Difference]: Without dead ends: 68 [2021-05-02 17:52:20,789 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3322 ImplicationChecksByTransitivity, 4106.7ms TimeCoverageRelationStatistics Valid=532, Invalid=15470, Unknown=0, NotChecked=0, Total=16002 [2021-05-02 17:52:20,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-05-02 17:52:20,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2021-05-02 17:52:20,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 62 states have (on average 1.0161290322580645) internal successors, (63), 62 states have internal predecessors, (63), 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 17:52:20,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2021-05-02 17:52:20,792 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 55 [2021-05-02 17:52:20,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:20,792 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2021-05-02 17:52:20,792 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 86 states, 86 states have (on average 1.1395348837209303) internal successors, (98), 84 states have internal predecessors, (98), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:20,792 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2021-05-02 17:52:20,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-02 17:52:20,793 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:20,793 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:21,007 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 17:52:21,008 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:21,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:21,008 INFO L82 PathProgramCache]: Analyzing trace with hash -242942050, now seen corresponding path program 5 times [2021-05-02 17:52:21,008 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:21,009 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [450744750] [2021-05-02 17:52:21,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:21,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:21,359 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:21,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:21,364 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2021-05-02 17:52:21,364 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:21,364 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [450744750] [2021-05-02 17:52:21,364 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [450744750] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:21,364 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [992620452] [2021-05-02 17:52:21,364 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 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 17:52:21,434 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-02 17:52:21,434 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:21,436 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 109 conjunts are in the unsatisfiable core [2021-05-02 17:52:21,438 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:22,894 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:22,895 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:22,898 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:22,957 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 115 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:22,958 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [992620452] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:22,958 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:22,958 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 55] total 60 [2021-05-02 17:52:22,958 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820410470] [2021-05-02 17:52:22,959 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2021-05-02 17:52:22,959 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:22,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-05-02 17:52:22,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=3338, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 17:52:22,960 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand has 60 states, 60 states have (on average 1.3166666666666667) internal successors, (79), 57 states have internal predecessors, (79), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:26,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:26,530 INFO L93 Difference]: Finished difference Result 65 states and 64 transitions. [2021-05-02 17:52:26,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-02 17:52:26,530 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 1.3166666666666667) internal successors, (79), 57 states have internal predecessors, (79), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 66 [2021-05-02 17:52:26,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:26,530 INFO L225 Difference]: With dead ends: 65 [2021-05-02 17:52:26,530 INFO L226 Difference]: Without dead ends: 0 [2021-05-02 17:52:26,532 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 16 SyntacticMatches, 48 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1782 ImplicationChecksByTransitivity, 3972.1ms TimeCoverageRelationStatistics Valid=519, Invalid=12137, Unknown=0, NotChecked=0, Total=12656 [2021-05-02 17:52:26,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-02 17:52:26,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-02 17:52:26,533 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 17:52:26,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-02 17:52:26,533 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 66 [2021-05-02 17:52:26,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:26,533 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-02 17:52:26,533 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 60 states, 60 states have (on average 1.3166666666666667) internal successors, (79), 57 states have internal predecessors, (79), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:26,533 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-02 17:52:26,533 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-02 17:52:26,738 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:26,741 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 05:52:26 BasicIcfg [2021-05-02 17:52:26,742 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 17:52:26,742 INFO L168 Benchmark]: Toolchain (without parser) took 20398.79 ms. Allocated memory was 189.8 MB in the beginning and 336.6 MB in the end (delta: 146.8 MB). Free memory was 155.4 MB in the beginning and 217.2 MB in the end (delta: -61.8 MB). Peak memory consumption was 86.2 MB. Max. memory is 8.0 GB. [2021-05-02 17:52:26,742 INFO L168 Benchmark]: CDTParser took 0.10 ms. Allocated memory is still 189.8 MB. Free memory is still 172.2 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 17:52:26,742 INFO L168 Benchmark]: CACSL2BoogieTranslator took 143.14 ms. Allocated memory is still 189.8 MB. Free memory was 155.2 MB in the beginning and 145.3 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-05-02 17:52:26,742 INFO L168 Benchmark]: Boogie Preprocessor took 71.88 ms. Allocated memory is still 189.8 MB. Free memory was 145.2 MB in the beginning and 173.6 MB in the end (delta: -28.3 MB). Peak memory consumption was 5.4 MB. Max. memory is 8.0 GB. [2021-05-02 17:52:26,742 INFO L168 Benchmark]: RCFGBuilder took 352.96 ms. Allocated memory is still 189.8 MB. Free memory was 173.6 MB in the beginning and 156.8 MB in the end (delta: 16.8 MB). Peak memory consumption was 16.8 MB. Max. memory is 8.0 GB. [2021-05-02 17:52:26,742 INFO L168 Benchmark]: IcfgTransformer took 22.73 ms. Allocated memory is still 189.8 MB. Free memory was 156.8 MB in the beginning and 155.7 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-05-02 17:52:26,742 INFO L168 Benchmark]: TraceAbstraction took 19803.37 ms. Allocated memory was 189.8 MB in the beginning and 336.6 MB in the end (delta: 146.8 MB). Free memory was 155.2 MB in the beginning and 217.2 MB in the end (delta: -62.0 MB). Peak memory consumption was 85.0 MB. Max. memory is 8.0 GB. [2021-05-02 17:52:26,743 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.10 ms. Allocated memory is still 189.8 MB. Free memory is still 172.2 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 143.14 ms. Allocated memory is still 189.8 MB. Free memory was 155.2 MB in the beginning and 145.3 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 71.88 ms. Allocated memory is still 189.8 MB. Free memory was 145.2 MB in the beginning and 173.6 MB in the end (delta: -28.3 MB). Peak memory consumption was 5.4 MB. Max. memory is 8.0 GB. * RCFGBuilder took 352.96 ms. Allocated memory is still 189.8 MB. Free memory was 173.6 MB in the beginning and 156.8 MB in the end (delta: 16.8 MB). Peak memory consumption was 16.8 MB. Max. memory is 8.0 GB. * IcfgTransformer took 22.73 ms. Allocated memory is still 189.8 MB. Free memory was 156.8 MB in the beginning and 155.7 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * TraceAbstraction took 19803.37 ms. Allocated memory was 189.8 MB in the beginning and 336.6 MB in the end (delta: 146.8 MB). Free memory was 155.2 MB in the beginning and 217.2 MB in the end (delta: -62.0 MB). Peak memory consumption was 85.0 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 8]: 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, 28 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 19760.7ms, OverallIterations: 10, TraceHistogramMax: 5, EmptinessCheckTime: 17.5ms, AutomataDifference: 10977.9ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 6.3ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 173 SDtfs, 286 SDslu, 632 SDs, 0 SdLazy, 11353 SolverSat, 622 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 3737.9ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 625 GetRequests, 167 SyntacticMatches, 59 SemanticMatches, 399 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5914 ImplicationChecksByTransitivity, 11352.6ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=131occurred in iteration=3, InterpolantAutomatonStates: 199, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 38.9ms AutomataMinimizationTime, 10 MinimizatonAttempts, 14 StatesRemovedByMinimization, 7 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 73.2ms SsaConstructionTime, 330.3ms SatisfiabilityAnalysisTime, 6783.4ms InterpolantComputationTime, 550 NumberOfCodeBlocks, 544 NumberOfCodeBlocksAsserted, 25 NumberOfCheckSat, 534 ConstructedInterpolants, 0 QuantifiedInterpolants, 4439 SizeOfPredicates, 6 NumberOfNonLiveVariables, 1134 ConjunctsInSsa, 357 ConjunctsInUnsatCore, 16 InterpolantComputations, 4 PerfectInterpolantSequences, 104/474 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...