/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/divbin2_unwindbound10.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 20:01:37,980 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 20:01:37,981 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 20:01:38,006 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 20:01:38,006 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 20:01:38,008 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 20:01:38,011 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 20:01:38,015 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 20:01:38,017 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 20:01:38,021 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 20:01:38,022 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 20:01:38,022 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 20:01:38,023 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 20:01:38,023 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 20:01:38,024 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 20:01:38,024 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 20:01:38,025 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 20:01:38,025 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 20:01:38,026 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 20:01:38,036 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 20:01:38,037 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 20:01:38,038 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 20:01:38,038 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 20:01:38,039 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 20:01:38,040 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 20:01:38,045 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 20:01:38,046 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 20:01:38,046 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 20:01:38,048 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 20:01:38,054 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 20:01:38,054 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 20:01:38,055 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 20:01:38,055 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 20:01:38,055 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 20:01:38,056 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 20:01:38,056 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 20:01:38,056 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 20:01:38,056 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 20:01:38,056 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 20:01:38,056 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 20:01:38,056 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 20:01:38,056 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 20:01:38,056 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 20:01:38,057 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 20:01:38,057 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 20:01:38,057 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 20:01:38,057 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 20:01:38,057 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 20:01:38,057 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 20:01:38,057 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 20:01:38,058 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 20:01:38,058 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 20:01:38,289 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 20:01:38,308 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 20:01:38,310 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 20:01:38,311 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 20:01:38,312 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 20:01:38,313 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/divbin2_unwindbound10.i [2021-05-02 20:01:38,360 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2b40e523a/366d07a4e6994e289cf9fed0f5ba7fb7/FLAGb590806ea [2021-05-02 20:01:38,730 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 20:01:38,731 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/divbin2_unwindbound10.i [2021-05-02 20:01:38,740 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2b40e523a/366d07a4e6994e289cf9fed0f5ba7fb7/FLAGb590806ea [2021-05-02 20:01:38,754 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2b40e523a/366d07a4e6994e289cf9fed0f5ba7fb7 [2021-05-02 20:01:38,762 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 20:01:38,765 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 20:01:38,767 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 20:01:38,767 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 20:01:38,770 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 20:01:38,770 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 08:01:38" (1/1) ... [2021-05-02 20:01:38,771 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7270ca1a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:01:38, skipping insertion in model container [2021-05-02 20:01:38,771 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 08:01:38" (1/1) ... [2021-05-02 20:01:38,776 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 20:01:38,789 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 20:01:38,891 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/divbin2_unwindbound10.i[959,972] [2021-05-02 20:01:38,901 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 20:01:38,907 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 20:01:38,947 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/divbin2_unwindbound10.i[959,972] [2021-05-02 20:01:38,967 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 20:01:38,980 INFO L208 MainTranslator]: Completed translation [2021-05-02 20:01:38,981 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:01:38 WrapperNode [2021-05-02 20:01:38,981 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 20:01:38,982 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 20:01:38,982 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 20:01:38,982 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 20:01:38,990 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:01:38" (1/1) ... [2021-05-02 20:01:38,990 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:01:38" (1/1) ... [2021-05-02 20:01:38,994 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:01:38" (1/1) ... [2021-05-02 20:01:38,994 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:01:38" (1/1) ... [2021-05-02 20:01:38,997 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:01:38" (1/1) ... [2021-05-02 20:01:39,000 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:01:38" (1/1) ... [2021-05-02 20:01:39,001 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:01:38" (1/1) ... [2021-05-02 20:01:39,002 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 20:01:39,003 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 20:01:39,003 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 20:01:39,003 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 20:01:39,004 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:01:38" (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 20:01:39,061 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 20:01:39,061 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 20:01:39,062 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 20:01:39,062 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 20:01:39,062 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 20:01:39,062 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 20:01:39,062 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 20:01:39,062 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 20:01:39,062 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 20:01:39,063 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 20:01:39,063 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 20:01:39,063 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 20:01:39,063 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_int [2021-05-02 20:01:39,063 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 20:01:39,064 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 20:01:39,064 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 20:01:39,064 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 20:01:39,064 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 20:01:39,064 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 20:01:39,064 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 20:01:39,066 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 20:01:39,066 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 20:01:39,338 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 20:01:39,338 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 20:01:39,339 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 08:01:39 BoogieIcfgContainer [2021-05-02 20:01:39,339 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 20:01:39,339 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 20:01:39,339 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 20:01:39,340 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 20:01:39,342 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 08:01:39" (1/1) ... [2021-05-02 20:01:39,369 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 08:01:39 BasicIcfg [2021-05-02 20:01:39,369 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 20:01:39,370 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 20:01:39,370 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 20:01:39,377 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 20:01:39,378 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 08:01:38" (1/4) ... [2021-05-02 20:01:39,378 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3c7723c0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 08:01:39, skipping insertion in model container [2021-05-02 20:01:39,378 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:01:38" (2/4) ... [2021-05-02 20:01:39,378 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3c7723c0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 08:01:39, skipping insertion in model container [2021-05-02 20:01:39,378 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 08:01:39" (3/4) ... [2021-05-02 20:01:39,379 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3c7723c0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 08:01:39, skipping insertion in model container [2021-05-02 20:01:39,379 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 08:01:39" (4/4) ... [2021-05-02 20:01:39,382 INFO L111 eAbstractionObserver]: Analyzing ICFG divbin2_unwindbound10.iJordan [2021-05-02 20:01:39,386 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 20:01:39,389 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 20:01:39,401 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 20:01:39,421 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 20:01:39,422 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 20:01:39,422 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 20:01:39,422 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 20:01:39,422 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 20:01:39,422 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 20:01:39,422 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 20:01:39,422 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 20:01:39,434 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 18 states have internal predecessors, (26), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 20:01:39,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 20:01:39,440 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:01:39,440 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:01:39,441 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:01:39,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:01:39,444 INFO L82 PathProgramCache]: Analyzing trace with hash 2097950667, now seen corresponding path program 1 times [2021-05-02 20:01:39,450 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:01:39,451 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1733885560] [2021-05-02 20:01:39,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:01:39,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:01:39,624 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 20:01:39,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:01:39,642 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 20:01:39,642 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:01:39,643 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1733885560] [2021-05-02 20:01:39,643 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1733885560] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:01:39,643 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:01:39,643 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 20:01:39,644 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352245944] [2021-05-02 20:01:39,648 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 20:01:39,648 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:01:39,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 20:01:39,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 20:01:39,660 INFO L87 Difference]: Start difference. First operand has 26 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 18 states have internal predecessors, (26), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 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 20:01:39,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:01:39,724 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2021-05-02 20:01:39,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 20:01:39,726 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 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 12 [2021-05-02 20:01:39,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:01:39,732 INFO L225 Difference]: With dead ends: 27 [2021-05-02 20:01:39,732 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 20:01:39,733 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 38.6ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 20:01:39,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 20:01:39,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2021-05-02 20:01:39,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:01:39,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 26 transitions. [2021-05-02 20:01:39,757 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 26 transitions. Word has length 12 [2021-05-02 20:01:39,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:01:39,757 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 26 transitions. [2021-05-02 20:01:39,758 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 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 20:01:39,758 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 26 transitions. [2021-05-02 20:01:39,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 20:01:39,758 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:01:39,758 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:01:39,759 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 20:01:39,759 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:01:39,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:01:39,760 INFO L82 PathProgramCache]: Analyzing trace with hash 923003056, now seen corresponding path program 1 times [2021-05-02 20:01:39,760 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:01:39,760 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [931272907] [2021-05-02 20:01:39,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:01:39,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:01:39,867 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 20:01:39,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:01:39,876 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 20:01:39,876 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:01:39,876 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [931272907] [2021-05-02 20:01:39,876 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [931272907] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:01:39,876 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:01:39,876 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 20:01:39,876 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [465551430] [2021-05-02 20:01:39,877 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 20:01:39,877 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:01:39,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 20:01:39,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 20:01:39,878 INFO L87 Difference]: Start difference. First operand 21 states and 26 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 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 20:01:39,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:01:39,936 INFO L93 Difference]: Finished difference Result 23 states and 28 transitions. [2021-05-02 20:01:39,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 20:01:39,936 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 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) Word has length 14 [2021-05-02 20:01:39,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:01:39,937 INFO L225 Difference]: With dead ends: 23 [2021-05-02 20:01:39,937 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 20:01:39,938 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 54.6ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:01:39,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 20:01:39,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-05-02 20:01:39,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:01:39,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 28 transitions. [2021-05-02 20:01:39,941 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 28 transitions. Word has length 14 [2021-05-02 20:01:39,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:01:39,941 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 28 transitions. [2021-05-02 20:01:39,941 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 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 20:01:39,941 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 28 transitions. [2021-05-02 20:01:39,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 20:01:39,941 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:01:39,942 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:01:39,942 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 20:01:39,942 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:01:39,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:01:39,942 INFO L82 PathProgramCache]: Analyzing trace with hash 1207414063, now seen corresponding path program 1 times [2021-05-02 20:01:39,942 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:01:39,943 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [105209769] [2021-05-02 20:01:39,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:01:39,951 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:01:39,951 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1236599944] [2021-05-02 20:01:39,951 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 20:01:39,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:01:39,997 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 20:01:40,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:01:40,026 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:40,030 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:40,031 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:40,043 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:40,046 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:40,047 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:40,058 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:40,060 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:40,080 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 20:01:40,081 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:01:40,081 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [105209769] [2021-05-02 20:01:40,081 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:01:40,081 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1236599944] [2021-05-02 20:01:40,081 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1236599944] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:01:40,081 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:01:40,082 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 20:01:40,082 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1685227125] [2021-05-02 20:01:40,082 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 20:01:40,082 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:01:40,082 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 20:01:40,082 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 20:01:40,083 INFO L87 Difference]: Start difference. First operand 23 states and 28 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 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 20:01:40,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:01:40,097 INFO L93 Difference]: Finished difference Result 27 states and 33 transitions. [2021-05-02 20:01:40,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 20:01:40,099 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 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) Word has length 15 [2021-05-02 20:01:40,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:01:40,099 INFO L225 Difference]: With dead ends: 27 [2021-05-02 20:01:40,099 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 20:01:40,100 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 7.3ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 20:01:40,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 20:01:40,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2021-05-02 20:01:40,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 19 states have (on average 1.368421052631579) internal successors, (26), 20 states have internal predecessors, (26), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:01:40,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2021-05-02 20:01:40,102 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 15 [2021-05-02 20:01:40,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:01:40,102 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2021-05-02 20:01:40,102 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 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 20:01:40,103 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2021-05-02 20:01:40,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 20:01:40,103 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:01:40,103 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:01:40,317 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 20:01:40,317 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:01:40,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:01:40,318 INFO L82 PathProgramCache]: Analyzing trace with hash 1208546121, now seen corresponding path program 1 times [2021-05-02 20:01:40,318 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:01:40,318 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [991191145] [2021-05-02 20:01:40,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:01:40,325 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:01:40,326 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [771848827] [2021-05-02 20:01:40,326 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 20:01:40,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:01:40,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 20:01:40,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:01:40,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:40,464 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:40,494 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 20:01:40,494 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:01:40,494 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [991191145] [2021-05-02 20:01:40,494 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:01:40,494 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [771848827] [2021-05-02 20:01:40,494 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [771848827] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:01:40,494 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:01:40,494 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 20:01:40,494 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1594825317] [2021-05-02 20:01:40,495 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 20:01:40,495 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:01:40,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 20:01:40,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:01:40,495 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 20:01:40,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:01:40,536 INFO L93 Difference]: Finished difference Result 33 states and 40 transitions. [2021-05-02 20:01:40,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 20:01:40,537 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 20:01:40,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:01:40,539 INFO L225 Difference]: With dead ends: 33 [2021-05-02 20:01:40,539 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 20:01:40,539 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 30.7ms TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 20:01:40,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 20:01:40,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 20:01:40,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 24 states have internal predecessors, (30), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:01:40,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 38 transitions. [2021-05-02 20:01:40,547 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 38 transitions. Word has length 15 [2021-05-02 20:01:40,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:01:40,548 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 38 transitions. [2021-05-02 20:01:40,548 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 20:01:40,548 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 38 transitions. [2021-05-02 20:01:40,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 20:01:40,550 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:01:40,550 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:01:40,765 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:01:40,765 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:01:40,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:01:40,766 INFO L82 PathProgramCache]: Analyzing trace with hash 1227316531, now seen corresponding path program 1 times [2021-05-02 20:01:40,766 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:01:40,766 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1909073922] [2021-05-02 20:01:40,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:01:40,783 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:01:40,783 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1676389910] [2021-05-02 20:01:40,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:01:40,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:01:40,830 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 20:01:40,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:01:40,841 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:40,843 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:40,844 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:40,849 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:40,851 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:40,852 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:40,862 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:40,864 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:40,876 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:01:40,876 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:01:40,876 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1909073922] [2021-05-02 20:01:40,876 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:01:40,876 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1676389910] [2021-05-02 20:01:40,876 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1676389910] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:01:40,876 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:01:40,876 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-02 20:01:40,876 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807211697] [2021-05-02 20:01:40,877 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 20:01:40,877 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:01:40,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 20:01:40,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 20:01:40,877 INFO L87 Difference]: Start difference. First operand 32 states and 38 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 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 20:01:40,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:01:40,902 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2021-05-02 20:01:40,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 20:01:40,903 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 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) Word has length 17 [2021-05-02 20:01:40,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:01:40,903 INFO L225 Difference]: With dead ends: 34 [2021-05-02 20:01:40,903 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 20:01:40,903 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 11.6ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:01:40,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 20:01:40,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-02 20:01:40,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 25 states have (on average 1.28) internal successors, (32), 26 states have internal predecessors, (32), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:01:40,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2021-05-02 20:01:40,906 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 17 [2021-05-02 20:01:40,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:01:40,906 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2021-05-02 20:01:40,906 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 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 20:01:40,906 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2021-05-02 20:01:40,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 20:01:40,907 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:01:40,907 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:01:41,122 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:01:41,123 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:01:41,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:01:41,123 INFO L82 PathProgramCache]: Analyzing trace with hash 2051197196, now seen corresponding path program 1 times [2021-05-02 20:01:41,123 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:01:41,123 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [773484831] [2021-05-02 20:01:41,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:01:41,130 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:01:41,130 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1308132069] [2021-05-02 20:01:41,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:01:41,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:01:41,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 20:01:41,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:01:41,173 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:41,176 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:41,177 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:41,187 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:41,191 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:41,193 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:41,211 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:41,215 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:41,215 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:41,228 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:41,231 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:41,244 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:01:41,244 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:01:41,244 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [773484831] [2021-05-02 20:01:41,245 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:01:41,245 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1308132069] [2021-05-02 20:01:41,245 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1308132069] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:01:41,245 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:01:41,245 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 20:01:41,245 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [355092342] [2021-05-02 20:01:41,245 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 20:01:41,245 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:01:41,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 20:01:41,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:01:41,246 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 20:01:41,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:01:41,273 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2021-05-02 20:01:41,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 20:01:41,273 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2021-05-02 20:01:41,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:01:41,274 INFO L225 Difference]: With dead ends: 39 [2021-05-02 20:01:41,275 INFO L226 Difference]: Without dead ends: 39 [2021-05-02 20:01:41,276 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 14.2ms TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-05-02 20:01:41,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-02 20:01:41,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2021-05-02 20:01:41,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 29 states have (on average 1.3103448275862069) internal successors, (38), 30 states have internal predecessors, (38), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:01:41,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2021-05-02 20:01:41,283 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 18 [2021-05-02 20:01:41,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:01:41,286 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2021-05-02 20:01:41,286 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 20:01:41,286 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2021-05-02 20:01:41,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 20:01:41,286 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:01:41,286 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:01:41,487 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:01:41,487 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:01:41,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:01:41,488 INFO L82 PathProgramCache]: Analyzing trace with hash 2052329254, now seen corresponding path program 1 times [2021-05-02 20:01:41,488 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:01:41,488 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [626260204] [2021-05-02 20:01:41,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:01:41,494 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:01:41,494 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1590068628] [2021-05-02 20:01:41,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 20:01:41,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:01:41,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 20:01:41,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:01:41,612 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:41,614 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:41,627 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:01:41,627 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:01:41,627 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [626260204] [2021-05-02 20:01:41,628 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:01:41,628 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1590068628] [2021-05-02 20:01:41,628 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1590068628] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:01:41,628 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:01:41,628 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 20:01:41,628 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384232204] [2021-05-02 20:01:41,628 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 20:01:41,628 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:01:41,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 20:01:41,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:01:41,629 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 20:01:41,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:01:41,683 INFO L93 Difference]: Finished difference Result 50 states and 61 transitions. [2021-05-02 20:01:41,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 20:01:41,685 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2021-05-02 20:01:41,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:01:41,686 INFO L225 Difference]: With dead ends: 50 [2021-05-02 20:01:41,687 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 20:01:41,687 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 22.4ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-02 20:01:41,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 20:01:41,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2021-05-02 20:01:41,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 35 states have (on average 1.2571428571428571) internal successors, (44), 36 states have internal predecessors, (44), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 20:01:41,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2021-05-02 20:01:41,691 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 18 [2021-05-02 20:01:41,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:01:41,691 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2021-05-02 20:01:41,692 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 20:01:41,692 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2021-05-02 20:01:41,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 20:01:41,692 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:01:41,692 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:01:41,897 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 20:01:41,897 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:01:41,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:01:41,898 INFO L82 PathProgramCache]: Analyzing trace with hash 462666167, now seen corresponding path program 1 times [2021-05-02 20:01:41,898 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:01:41,898 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1823846360] [2021-05-02 20:01:41,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:01:41,918 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:01:41,918 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1307790790] [2021-05-02 20:01:41,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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) [2021-05-02 20:01:41,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:01:41,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 20:01:41,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:01:42,259 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:01:42,260 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:01:42,260 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1823846360] [2021-05-02 20:01:42,260 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:01:42,260 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1307790790] [2021-05-02 20:01:42,260 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1307790790] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:01:42,260 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:01:42,260 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 20:01:42,260 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1649234316] [2021-05-02 20:01:42,260 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 20:01:42,261 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:01:42,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 20:01:42,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 20:01:42,261 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:01:42,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:01:42,284 INFO L93 Difference]: Finished difference Result 43 states and 49 transitions. [2021-05-02 20:01:42,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 20:01:42,285 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 24 [2021-05-02 20:01:42,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:01:42,285 INFO L225 Difference]: With dead ends: 43 [2021-05-02 20:01:42,285 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 20:01:42,285 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 31.4ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 20:01:42,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 20:01:42,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-05-02 20:01:42,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 27 states have internal predecessors, (33), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:01:42,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 41 transitions. [2021-05-02 20:01:42,287 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 41 transitions. Word has length 24 [2021-05-02 20:01:42,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:01:42,287 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 41 transitions. [2021-05-02 20:01:42,287 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:01:42,288 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 41 transitions. [2021-05-02 20:01:42,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 20:01:42,288 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:01:42,288 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:01:42,504 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:01:42,505 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:01:42,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:01:42,505 INFO L82 PathProgramCache]: Analyzing trace with hash -269721504, now seen corresponding path program 1 times [2021-05-02 20:01:42,505 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:01:42,505 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [233251592] [2021-05-02 20:01:42,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:01:42,561 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:01:42,562 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [319682073] [2021-05-02 20:01:42,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:01:42,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:01:42,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 20:01:42,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:01:42,658 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:42,667 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:42,670 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:42,682 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:42,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:42,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:42,704 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:42,708 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:42,708 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:42,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:42,728 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:42,729 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:42,754 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:42,758 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:42,795 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:01:42,796 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:01:42,796 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [233251592] [2021-05-02 20:01:42,796 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:01:42,796 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [319682073] [2021-05-02 20:01:42,796 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [319682073] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:01:42,796 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:01:42,796 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 20:01:42,796 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [839082997] [2021-05-02 20:01:42,796 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 20:01:42,796 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:01:42,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 20:01:42,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 20:01:42,798 INFO L87 Difference]: Start difference. First operand 35 states and 41 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:01:42,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:01:42,831 INFO L93 Difference]: Finished difference Result 53 states and 63 transitions. [2021-05-02 20:01:42,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 20:01:42,832 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 27 [2021-05-02 20:01:42,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:01:42,832 INFO L225 Difference]: With dead ends: 53 [2021-05-02 20:01:42,832 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 20:01:42,833 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 36.4ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 20:01:42,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 20:01:42,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 47. [2021-05-02 20:01:42,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 36 states have (on average 1.25) internal successors, (45), 37 states have internal predecessors, (45), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 20:01:42,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2021-05-02 20:01:42,865 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 27 [2021-05-02 20:01:42,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:01:42,865 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2021-05-02 20:01:42,865 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:01:42,865 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2021-05-02 20:01:42,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 20:01:42,866 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:01:42,866 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:01:43,082 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:01:43,082 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:01:43,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:01:43,083 INFO L82 PathProgramCache]: Analyzing trace with hash -268589446, now seen corresponding path program 1 times [2021-05-02 20:01:43,083 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:01:43,083 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [886545736] [2021-05-02 20:01:43,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:01:43,090 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:01:43,091 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [624538299] [2021-05-02 20:01:43,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:01:43,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:01:43,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 20:01:43,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:01:43,303 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:43,307 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:43,377 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:43,379 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:43,399 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:01:43,400 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:01:43,400 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [886545736] [2021-05-02 20:01:43,400 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:01:43,400 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [624538299] [2021-05-02 20:01:43,400 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [624538299] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:01:43,400 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:01:43,400 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 20:01:43,400 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1469645301] [2021-05-02 20:01:43,400 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 20:01:43,400 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:01:43,401 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 20:01:43,401 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-05-02 20:01:43,401 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:01:43,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:01:43,608 INFO L93 Difference]: Finished difference Result 62 states and 71 transitions. [2021-05-02 20:01:43,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 20:01:43,608 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 27 [2021-05-02 20:01:43,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:01:43,609 INFO L225 Difference]: With dead ends: 62 [2021-05-02 20:01:43,609 INFO L226 Difference]: Without dead ends: 61 [2021-05-02 20:01:43,609 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 135.4ms TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-02 20:01:43,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-02 20:01:43,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53. [2021-05-02 20:01:43,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 40 states have (on average 1.225) internal successors, (49), 41 states have internal predecessors, (49), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 20:01:43,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 61 transitions. [2021-05-02 20:01:43,612 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 61 transitions. Word has length 27 [2021-05-02 20:01:43,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:01:43,612 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 61 transitions. [2021-05-02 20:01:43,612 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 10 states have internal predecessors, (21), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:01:43,612 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 61 transitions. [2021-05-02 20:01:43,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 20:01:43,613 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:01:43,613 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:01:43,823 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 20:01:43,823 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:01:43,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:01:43,824 INFO L82 PathProgramCache]: Analyzing trace with hash -1346351076, now seen corresponding path program 1 times [2021-05-02 20:01:43,824 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:01:43,824 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1375861439] [2021-05-02 20:01:43,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:01:43,831 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:01:43,831 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1227639682] [2021-05-02 20:01:43,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:01:43,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:01:43,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 20:01:43,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:01:43,918 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:43,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:43,921 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:43,927 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:43,928 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:43,929 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:43,936 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:43,938 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:43,938 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:43,952 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:43,974 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:43,995 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 20:01:43,995 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:01:43,995 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1375861439] [2021-05-02 20:01:43,995 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:01:43,995 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1227639682] [2021-05-02 20:01:43,995 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1227639682] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:01:43,995 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:01:43,995 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 20:01:43,996 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943215732] [2021-05-02 20:01:43,996 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 20:01:43,996 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:01:43,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 20:01:43,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:01:43,997 INFO L87 Difference]: Start difference. First operand 53 states and 61 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:01:44,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:01:44,038 INFO L93 Difference]: Finished difference Result 55 states and 63 transitions. [2021-05-02 20:01:44,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 20:01:44,038 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 29 [2021-05-02 20:01:44,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:01:44,039 INFO L225 Difference]: With dead ends: 55 [2021-05-02 20:01:44,039 INFO L226 Difference]: Without dead ends: 55 [2021-05-02 20:01:44,039 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 35.2ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-02 20:01:44,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-02 20:01:44,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-05-02 20:01:44,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 42 states have (on average 1.2142857142857142) internal successors, (51), 43 states have internal predecessors, (51), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 20:01:44,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 63 transitions. [2021-05-02 20:01:44,050 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 63 transitions. Word has length 29 [2021-05-02 20:01:44,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:01:44,050 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 63 transitions. [2021-05-02 20:01:44,050 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:01:44,050 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 63 transitions. [2021-05-02 20:01:44,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 20:01:44,054 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:01:44,055 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:01:44,281 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:01:44,281 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:01:44,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:01:44,281 INFO L82 PathProgramCache]: Analyzing trace with hash -1031563075, now seen corresponding path program 2 times [2021-05-02 20:01:44,282 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:01:44,282 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1953835652] [2021-05-02 20:01:44,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:01:44,288 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:01:44,288 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [116298981] [2021-05-02 20:01:44,288 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 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:01:44,367 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 20:01:44,367 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:01:44,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 20:01:44,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:01:44,376 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:44,378 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:44,378 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:44,382 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:44,383 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:44,384 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:44,391 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:44,392 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:44,393 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:44,401 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:44,403 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:44,403 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:44,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:44,413 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:44,414 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:44,430 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:44,431 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:44,441 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:01:44,441 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:01:44,441 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1953835652] [2021-05-02 20:01:44,441 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:01:44,442 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [116298981] [2021-05-02 20:01:44,442 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [116298981] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:01:44,442 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:01:44,442 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 20:01:44,442 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643012613] [2021-05-02 20:01:44,442 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 20:01:44,442 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:01:44,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 20:01:44,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 20:01:44,443 INFO L87 Difference]: Start difference. First operand 55 states and 63 transitions. Second operand has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:01:44,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:01:44,482 INFO L93 Difference]: Finished difference Result 74 states and 87 transitions. [2021-05-02 20:01:44,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 20:01:44,482 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 30 [2021-05-02 20:01:44,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:01:44,483 INFO L225 Difference]: With dead ends: 74 [2021-05-02 20:01:44,483 INFO L226 Difference]: Without dead ends: 74 [2021-05-02 20:01:44,483 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 29.1ms TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-05-02 20:01:44,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-05-02 20:01:44,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 68. [2021-05-02 20:01:44,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 53 states have (on average 1.2264150943396226) internal successors, (65), 54 states have internal predecessors, (65), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 20:01:44,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 79 transitions. [2021-05-02 20:01:44,487 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 79 transitions. Word has length 30 [2021-05-02 20:01:44,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:01:44,487 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 79 transitions. [2021-05-02 20:01:44,487 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:01:44,487 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 79 transitions. [2021-05-02 20:01:44,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 20:01:44,488 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:01:44,488 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:01:44,696 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:01:44,697 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:01:44,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:01:44,698 INFO L82 PathProgramCache]: Analyzing trace with hash -1030431017, now seen corresponding path program 2 times [2021-05-02 20:01:44,698 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:01:44,698 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1233184203] [2021-05-02 20:01:44,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:01:44,704 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:01:44,704 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1645026173] [2021-05-02 20:01:44,704 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 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:01:44,795 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 20:01:44,795 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:01:44,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 20:01:44,797 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:01:44,847 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:44,848 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:44,867 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:44,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:44,933 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:44,935 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:44,951 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:01:44,951 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:01:44,951 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1233184203] [2021-05-02 20:01:44,951 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:01:44,951 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1645026173] [2021-05-02 20:01:44,951 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1645026173] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:01:44,951 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:01:44,951 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 20:01:44,952 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615277923] [2021-05-02 20:01:44,952 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 20:01:44,952 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:01:44,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 20:01:44,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-05-02 20:01:44,952 INFO L87 Difference]: Start difference. First operand 68 states and 79 transitions. Second operand has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:01:45,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:01:45,102 INFO L93 Difference]: Finished difference Result 93 states and 109 transitions. [2021-05-02 20:01:45,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 20:01:45,103 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 30 [2021-05-02 20:01:45,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:01:45,103 INFO L225 Difference]: With dead ends: 93 [2021-05-02 20:01:45,103 INFO L226 Difference]: Without dead ends: 92 [2021-05-02 20:01:45,104 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 74.3ms TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 20:01:45,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-05-02 20:01:45,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 88. [2021-05-02 20:01:45,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 68 states have (on average 1.1911764705882353) internal successors, (81), 70 states have internal predecessors, (81), 11 states have call successors, (11), 9 states have call predecessors, (11), 8 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 20:01:45,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 101 transitions. [2021-05-02 20:01:45,108 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 101 transitions. Word has length 30 [2021-05-02 20:01:45,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:01:45,108 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 101 transitions. [2021-05-02 20:01:45,108 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:01:45,108 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 101 transitions. [2021-05-02 20:01:45,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 20:01:45,109 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:01:45,109 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:01:45,317 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 20:01:45,317 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:01:45,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:01:45,317 INFO L82 PathProgramCache]: Analyzing trace with hash 1111952806, now seen corresponding path program 3 times [2021-05-02 20:01:45,317 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:01:45,317 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1689343398] [2021-05-02 20:01:45,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:01:45,323 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:01:45,323 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [776859299] [2021-05-02 20:01:45,323 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 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:01:46,295 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 20:01:46,296 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:01:46,299 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 20:01:46,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:01:46,365 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:46,367 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:46,485 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:46,492 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:46,562 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 11 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 20:01:46,562 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:01:46,562 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1689343398] [2021-05-02 20:01:46,563 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:01:46,563 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [776859299] [2021-05-02 20:01:46,563 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [776859299] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:01:46,563 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:01:46,563 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 20:01:46,563 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [398073592] [2021-05-02 20:01:46,563 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 20:01:46,563 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:01:46,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 20:01:46,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:01:46,564 INFO L87 Difference]: Start difference. First operand 88 states and 101 transitions. Second operand has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:01:46,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:01:46,612 INFO L93 Difference]: Finished difference Result 71 states and 78 transitions. [2021-05-02 20:01:46,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 20:01:46,612 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 36 [2021-05-02 20:01:46,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:01:46,630 INFO L225 Difference]: With dead ends: 71 [2021-05-02 20:01:46,631 INFO L226 Difference]: Without dead ends: 54 [2021-05-02 20:01:46,631 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 35.4ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:01:46,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-02 20:01:46,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 46. [2021-05-02 20:01:46,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 35 states have (on average 1.2) internal successors, (42), 36 states have internal predecessors, (42), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 20:01:46,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 52 transitions. [2021-05-02 20:01:46,635 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 52 transitions. Word has length 36 [2021-05-02 20:01:46,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:01:46,635 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 52 transitions. [2021-05-02 20:01:46,635 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:01:46,635 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 52 transitions. [2021-05-02 20:01:46,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 20:01:46,635 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:01:46,635 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:01:46,840 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 20:01:46,840 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:01:46,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:01:46,841 INFO L82 PathProgramCache]: Analyzing trace with hash 954968015, now seen corresponding path program 3 times [2021-05-02 20:01:46,841 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:01:46,841 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1956687483] [2021-05-02 20:01:46,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:01:46,846 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:01:46,846 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [497256595] [2021-05-02 20:01:46,846 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 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:01:47,342 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 20:01:47,342 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:01:47,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 20:01:47,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:01:47,356 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:47,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:47,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:47,362 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:47,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:47,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:47,371 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:47,372 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:47,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:47,380 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:47,381 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:47,382 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:47,390 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:47,391 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:47,392 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:47,407 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:47,408 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:47,408 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:47,424 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:47,426 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:47,435 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 4 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:01:47,435 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:01:47,435 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1956687483] [2021-05-02 20:01:47,435 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:01:47,435 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [497256595] [2021-05-02 20:01:47,435 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [497256595] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:01:47,435 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:01:47,435 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 20:01:47,436 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [760661335] [2021-05-02 20:01:47,436 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 20:01:47,436 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:01:47,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 20:01:47,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 20:01:47,436 INFO L87 Difference]: Start difference. First operand 46 states and 52 transitions. Second operand has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 8 states have internal predecessors, (31), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:01:47,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:01:47,479 INFO L93 Difference]: Finished difference Result 87 states and 101 transitions. [2021-05-02 20:01:47,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 20:01:47,479 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 8 states have internal predecessors, (31), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 39 [2021-05-02 20:01:47,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:01:47,480 INFO L225 Difference]: With dead ends: 87 [2021-05-02 20:01:47,480 INFO L226 Difference]: Without dead ends: 87 [2021-05-02 20:01:47,481 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 33.1ms TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-05-02 20:01:47,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-02 20:01:47,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 67. [2021-05-02 20:01:47,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 52 states have (on average 1.1923076923076923) internal successors, (62), 53 states have internal predecessors, (62), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 20:01:47,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 76 transitions. [2021-05-02 20:01:47,485 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 76 transitions. Word has length 39 [2021-05-02 20:01:47,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:01:47,486 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 76 transitions. [2021-05-02 20:01:47,486 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 8 states have internal predecessors, (31), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:01:47,486 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 76 transitions. [2021-05-02 20:01:47,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 20:01:47,487 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:01:47,487 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:01:47,692 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 20:01:47,692 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:01:47,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:01:47,692 INFO L82 PathProgramCache]: Analyzing trace with hash 956100073, now seen corresponding path program 4 times [2021-05-02 20:01:47,692 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:01:47,692 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [986158765] [2021-05-02 20:01:47,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:01:47,699 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:01:47,699 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [62674691] [2021-05-02 20:01:47,699 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 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:01:47,922 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 20:01:47,922 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:01:47,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 45 conjunts are in the unsatisfiable core [2021-05-02 20:01:47,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:01:48,026 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:48,028 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:48,137 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:48,144 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:48,229 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:48,233 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:48,267 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 3 proven. 24 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 20:01:48,268 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:01:48,268 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [986158765] [2021-05-02 20:01:48,268 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:01:48,268 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [62674691] [2021-05-02 20:01:48,268 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [62674691] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:01:48,282 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:01:48,282 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-05-02 20:01:48,283 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [834063634] [2021-05-02 20:01:48,283 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 20:01:48,283 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:01:48,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 20:01:48,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2021-05-02 20:01:48,284 INFO L87 Difference]: Start difference. First operand 67 states and 76 transitions. Second operand has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:01:48,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:01:48,561 INFO L93 Difference]: Finished difference Result 79 states and 90 transitions. [2021-05-02 20:01:48,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 20:01:48,561 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 39 [2021-05-02 20:01:48,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:01:48,562 INFO L225 Difference]: With dead ends: 79 [2021-05-02 20:01:48,562 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 20:01:48,562 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 228.0ms TimeCoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2021-05-02 20:01:48,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 20:01:48,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 65. [2021-05-02 20:01:48,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 50 states have (on average 1.18) internal successors, (59), 51 states have internal predecessors, (59), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 20:01:48,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 73 transitions. [2021-05-02 20:01:48,564 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 73 transitions. Word has length 39 [2021-05-02 20:01:48,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:01:48,565 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 73 transitions. [2021-05-02 20:01:48,565 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:01:48,565 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 73 transitions. [2021-05-02 20:01:48,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 20:01:48,565 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:01:48,565 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:01:48,769 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:01:48,770 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:01:48,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:01:48,770 INFO L82 PathProgramCache]: Analyzing trace with hash -1223907629, now seen corresponding path program 2 times [2021-05-02 20:01:48,770 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:01:48,770 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1163596730] [2021-05-02 20:01:48,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:01:48,779 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:01:48,779 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1667082128] [2021-05-02 20:01:48,779 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:01:48,822 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 20:01:48,822 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:01:48,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 20:01:48,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:01:48,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:48,836 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:48,838 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:48,842 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:48,843 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:48,844 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:48,851 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:48,853 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:48,853 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:48,861 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:48,862 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:48,862 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:48,871 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:48,872 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:48,903 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-05-02 20:01:48,904 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:01:48,904 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1163596730] [2021-05-02 20:01:48,904 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:01:48,904 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1667082128] [2021-05-02 20:01:48,904 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1667082128] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:01:48,904 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:01:48,904 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 20:01:48,906 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [673826024] [2021-05-02 20:01:48,906 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 20:01:48,906 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:01:48,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 20:01:48,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 20:01:48,908 INFO L87 Difference]: Start difference. First operand 65 states and 73 transitions. Second operand has 7 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:01:48,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:01:48,940 INFO L93 Difference]: Finished difference Result 67 states and 75 transitions. [2021-05-02 20:01:48,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 20:01:48,940 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 41 [2021-05-02 20:01:48,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:01:48,940 INFO L225 Difference]: With dead ends: 67 [2021-05-02 20:01:48,940 INFO L226 Difference]: Without dead ends: 67 [2021-05-02 20:01:48,941 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 29.5ms TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-05-02 20:01:48,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-05-02 20:01:48,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2021-05-02 20:01:48,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 52 states have (on average 1.1730769230769231) internal successors, (61), 53 states have internal predecessors, (61), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 20:01:48,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 75 transitions. [2021-05-02 20:01:48,943 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 75 transitions. Word has length 41 [2021-05-02 20:01:48,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:01:48,943 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 75 transitions. [2021-05-02 20:01:48,943 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:01:48,943 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 75 transitions. [2021-05-02 20:01:48,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 20:01:48,944 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:01:48,944 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:01:49,157 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 20:01:49,157 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:01:49,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:01:49,158 INFO L82 PathProgramCache]: Analyzing trace with hash 805846188, now seen corresponding path program 4 times [2021-05-02 20:01:49,158 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:01:49,158 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [664955124] [2021-05-02 20:01:49,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:01:49,176 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:01:49,176 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1763228462] [2021-05-02 20:01:49,176 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:01:49,221 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 20:01:49,222 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:01:49,222 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 20:01:49,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:01:49,231 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:49,232 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:49,232 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:49,236 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:49,237 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:49,237 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:49,246 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:49,247 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:49,247 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:49,255 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:49,256 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:49,257 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:49,265 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:49,266 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:49,267 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:49,283 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:49,284 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:49,284 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:49,302 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:49,304 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:49,304 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:49,324 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:49,326 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:49,341 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 4 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:01:49,341 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:01:49,341 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [664955124] [2021-05-02 20:01:49,341 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:01:49,341 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1763228462] [2021-05-02 20:01:49,341 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1763228462] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:01:49,341 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:01:49,341 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 20:01:49,341 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286183749] [2021-05-02 20:01:49,343 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 20:01:49,343 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:01:49,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 20:01:49,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 20:01:49,344 INFO L87 Difference]: Start difference. First operand 67 states and 75 transitions. Second operand has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:01:49,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:01:49,404 INFO L93 Difference]: Finished difference Result 108 states and 124 transitions. [2021-05-02 20:01:49,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 20:01:49,404 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 42 [2021-05-02 20:01:49,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:01:49,407 INFO L225 Difference]: With dead ends: 108 [2021-05-02 20:01:49,407 INFO L226 Difference]: Without dead ends: 108 [2021-05-02 20:01:49,408 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 55.3ms TimeCoverageRelationStatistics Valid=56, Invalid=100, Unknown=0, NotChecked=0, Total=156 [2021-05-02 20:01:49,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-05-02 20:01:49,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 88. [2021-05-02 20:01:49,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 69 states have (on average 1.173913043478261) internal successors, (81), 70 states have internal predecessors, (81), 10 states have call successors, (10), 9 states have call predecessors, (10), 8 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 20:01:49,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 99 transitions. [2021-05-02 20:01:49,410 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 99 transitions. Word has length 42 [2021-05-02 20:01:49,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:01:49,411 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 99 transitions. [2021-05-02 20:01:49,411 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:01:49,411 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 99 transitions. [2021-05-02 20:01:49,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 20:01:49,412 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:01:49,412 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:01:49,628 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 20:01:49,629 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:01:49,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:01:49,629 INFO L82 PathProgramCache]: Analyzing trace with hash 806978246, now seen corresponding path program 5 times [2021-05-02 20:01:49,629 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:01:49,629 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1120058689] [2021-05-02 20:01:49,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:01:49,635 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:01:49,635 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [769641780] [2021-05-02 20:01:49,635 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:01:49,925 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-02 20:01:49,926 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:01:49,944 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 20:01:49,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:01:50,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:50,020 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:50,194 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2021-05-02 20:01:50,249 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:50,271 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:50,379 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:50,380 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:50,421 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 3 proven. 33 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 20:01:50,421 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:01:50,421 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1120058689] [2021-05-02 20:01:50,421 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:01:50,421 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [769641780] [2021-05-02 20:01:50,421 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [769641780] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:01:50,421 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:01:50,421 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-05-02 20:01:50,422 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729204350] [2021-05-02 20:01:50,423 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 20:01:50,423 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:01:50,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 20:01:50,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-05-02 20:01:50,423 INFO L87 Difference]: Start difference. First operand 88 states and 99 transitions. Second operand has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:01:50,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:01:50,756 INFO L93 Difference]: Finished difference Result 129 states and 148 transitions. [2021-05-02 20:01:50,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 20:01:50,757 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 42 [2021-05-02 20:01:50,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:01:50,758 INFO L225 Difference]: With dead ends: 129 [2021-05-02 20:01:50,758 INFO L226 Difference]: Without dead ends: 127 [2021-05-02 20:01:50,758 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 342.3ms TimeCoverageRelationStatistics Valid=41, Invalid=231, Unknown=0, NotChecked=0, Total=272 [2021-05-02 20:01:50,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-05-02 20:01:50,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 97. [2021-05-02 20:01:50,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 76 states have (on average 1.1710526315789473) internal successors, (89), 77 states have internal predecessors, (89), 11 states have call successors, (11), 10 states have call predecessors, (11), 9 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 20:01:50,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 109 transitions. [2021-05-02 20:01:50,763 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 109 transitions. Word has length 42 [2021-05-02 20:01:50,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:01:50,763 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 109 transitions. [2021-05-02 20:01:50,763 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:01:50,763 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 109 transitions. [2021-05-02 20:01:50,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 20:01:50,764 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:01:50,764 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:01:50,969 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:01:50,969 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:01:50,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:01:50,969 INFO L82 PathProgramCache]: Analyzing trace with hash 1498904688, now seen corresponding path program 3 times [2021-05-02 20:01:50,969 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:01:50,970 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1786131337] [2021-05-02 20:01:50,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:01:50,976 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:01:50,976 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [177602509] [2021-05-02 20:01:50,976 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 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:01:53,174 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 20:01:53,174 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:01:53,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 20:01:53,179 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:01:53,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:53,340 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:53,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:53,348 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:53,385 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-05-02 20:01:53,385 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:01:53,385 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1786131337] [2021-05-02 20:01:53,385 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:01:53,385 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [177602509] [2021-05-02 20:01:53,385 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [177602509] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:01:53,385 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:01:53,385 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 20:01:53,385 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1015906498] [2021-05-02 20:01:53,386 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 20:01:53,386 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:01:53,386 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 20:01:53,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 20:01:53,386 INFO L87 Difference]: Start difference. First operand 97 states and 109 transitions. Second operand has 5 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:01:53,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:01:53,421 INFO L93 Difference]: Finished difference Result 99 states and 110 transitions. [2021-05-02 20:01:53,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 20:01:53,421 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 44 [2021-05-02 20:01:53,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:01:53,422 INFO L225 Difference]: With dead ends: 99 [2021-05-02 20:01:53,422 INFO L226 Difference]: Without dead ends: 97 [2021-05-02 20:01:53,422 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 15.6ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:01:53,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-05-02 20:01:53,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2021-05-02 20:01:53,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 76 states have (on average 1.1578947368421053) internal successors, (88), 77 states have internal predecessors, (88), 11 states have call successors, (11), 10 states have call predecessors, (11), 9 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 20:01:53,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 108 transitions. [2021-05-02 20:01:53,425 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 108 transitions. Word has length 44 [2021-05-02 20:01:53,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:01:53,426 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 108 transitions. [2021-05-02 20:01:53,426 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 20:01:53,426 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 108 transitions. [2021-05-02 20:01:53,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 20:01:53,426 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:01:53,426 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:01:53,632 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:01:53,633 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:01:53,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:01:53,633 INFO L82 PathProgramCache]: Analyzing trace with hash -686317905, now seen corresponding path program 5 times [2021-05-02 20:01:53,633 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:01:53,633 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [743225547] [2021-05-02 20:01:53,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:01:53,639 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:01:53,639 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2072902429] [2021-05-02 20:01:53,639 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 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:01:53,758 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-05-02 20:01:53,758 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:01:53,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 20:01:53,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:01:53,775 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:53,777 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:53,777 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:53,787 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:53,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:53,789 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:53,801 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:53,803 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:53,803 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:53,825 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:53,826 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:53,827 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:53,835 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:53,836 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:53,836 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:53,862 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:53,864 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:53,869 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:53,884 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:53,889 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:53,890 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:53,908 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:53,913 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:53,933 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:53,964 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:53,965 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:01:53,982 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 4 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 20:01:53,983 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:01:53,983 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [743225547] [2021-05-02 20:01:53,983 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:01:53,983 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2072902429] [2021-05-02 20:01:53,983 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2072902429] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:01:53,983 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:01:53,983 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 20:01:53,983 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1373325220] [2021-05-02 20:01:53,983 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 20:01:53,984 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:01:53,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 20:01:53,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-02 20:01:53,984 INFO L87 Difference]: Start difference. First operand 97 states and 108 transitions. Second operand has 11 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 10 states have internal predecessors, (37), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:01:54,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:01:54,062 INFO L93 Difference]: Finished difference Result 149 states and 167 transitions. [2021-05-02 20:01:54,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 20:01:54,063 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 10 states have internal predecessors, (37), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 45 [2021-05-02 20:01:54,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:01:54,064 INFO L225 Difference]: With dead ends: 149 [2021-05-02 20:01:54,064 INFO L226 Difference]: Without dead ends: 149 [2021-05-02 20:01:54,064 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 86.0ms TimeCoverageRelationStatistics Valid=75, Invalid=135, Unknown=0, NotChecked=0, Total=210 [2021-05-02 20:01:54,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-05-02 20:01:54,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 127. [2021-05-02 20:01:54,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 99 states have (on average 1.1717171717171717) internal successors, (116), 101 states have internal predecessors, (116), 15 states have call successors, (15), 13 states have call predecessors, (15), 12 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-02 20:01:54,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 143 transitions. [2021-05-02 20:01:54,068 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 143 transitions. Word has length 45 [2021-05-02 20:01:54,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:01:54,068 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 143 transitions. [2021-05-02 20:01:54,068 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 10 states have internal predecessors, (37), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 20:01:54,068 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 143 transitions. [2021-05-02 20:01:54,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 20:01:54,068 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:01:54,069 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:01:54,271 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:01:54,272 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:01:54,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:01:54,272 INFO L82 PathProgramCache]: Analyzing trace with hash -685185847, now seen corresponding path program 6 times [2021-05-02 20:01:54,273 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:01:54,273 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2143270872] [2021-05-02 20:01:54,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:01:54,282 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:01:54,282 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [398171575] [2021-05-02 20:01:54,282 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true