/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/divbin_unwindbound5.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 20:12:54,180 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 20:12:54,182 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 20:12:54,218 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 20:12:54,218 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 20:12:54,221 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 20:12:54,223 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 20:12:54,228 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 20:12:54,230 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 20:12:54,234 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 20:12:54,235 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 20:12:54,236 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 20:12:54,237 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 20:12:54,238 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 20:12:54,239 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 20:12:54,241 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 20:12:54,243 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 20:12:54,244 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 20:12:54,246 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 20:12:54,251 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 20:12:54,252 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 20:12:54,253 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 20:12:54,254 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 20:12:54,256 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 20:12:54,261 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 20:12:54,271 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 20:12:54,272 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 20:12:54,272 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 20:12:54,273 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 20:12:54,289 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 20:12:54,290 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 20:12:54,292 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 20:12:54,293 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 20:12:54,293 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 20:12:54,293 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 20:12:54,293 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 20:12:54,293 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 20:12:54,293 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 20:12:54,293 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 20:12:54,294 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 20:12:54,295 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 20:12:54,295 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 20:12:54,295 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 20:12:54,295 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 20:12:54,295 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 20:12:54,295 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 20:12:54,296 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 20:12:54,296 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 20:12:54,296 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 20:12:54,296 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 20:12:54,297 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 20:12:54,297 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 20:12:54,654 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 20:12:54,679 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 20:12:54,682 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 20:12:54,683 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 20:12:54,683 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 20:12:54,684 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/divbin_unwindbound5.i [2021-05-02 20:12:54,755 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/965efeba6/a64f76d3809e4a67af7e667fa38f0d63/FLAGd526b9ee1 [2021-05-02 20:12:55,113 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 20:12:55,114 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/divbin_unwindbound5.i [2021-05-02 20:12:55,122 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/965efeba6/a64f76d3809e4a67af7e667fa38f0d63/FLAGd526b9ee1 [2021-05-02 20:12:55,134 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/965efeba6/a64f76d3809e4a67af7e667fa38f0d63 [2021-05-02 20:12:55,137 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 20:12:55,138 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 20:12:55,142 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 20:12:55,143 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 20:12:55,146 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 20:12:55,146 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 08:12:55" (1/1) ... [2021-05-02 20:12:55,147 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4aaba3c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:12:55, skipping insertion in model container [2021-05-02 20:12:55,148 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 08:12:55" (1/1) ... [2021-05-02 20:12:55,153 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 20:12:55,168 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 20:12:55,319 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/divbin_unwindbound5.i[958,971] [2021-05-02 20:12:55,353 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 20:12:55,360 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 20:12:55,380 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/divbin_unwindbound5.i[958,971] [2021-05-02 20:12:55,410 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 20:12:55,423 INFO L208 MainTranslator]: Completed translation [2021-05-02 20:12:55,424 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:12:55 WrapperNode [2021-05-02 20:12:55,424 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 20:12:55,425 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 20:12:55,425 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 20:12:55,425 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 20:12:55,435 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:12:55" (1/1) ... [2021-05-02 20:12:55,435 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:12:55" (1/1) ... [2021-05-02 20:12:55,441 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:12:55" (1/1) ... [2021-05-02 20:12:55,441 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:12:55" (1/1) ... [2021-05-02 20:12:55,453 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:12:55" (1/1) ... [2021-05-02 20:12:55,458 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:12:55" (1/1) ... [2021-05-02 20:12:55,462 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:12:55" (1/1) ... [2021-05-02 20:12:55,467 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 20:12:55,468 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 20:12:55,469 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 20:12:55,469 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 20:12:55,469 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:12:55" (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 20:12:55,530 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 20:12:55,530 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 20:12:55,530 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 20:12:55,531 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 20:12:55,531 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 20:12:55,531 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 20:12:55,531 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 20:12:55,531 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 20:12:55,531 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 20:12:55,531 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 20:12:55,532 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 20:12:55,532 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 20:12:55,532 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_int [2021-05-02 20:12:55,532 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 20:12:55,532 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 20:12:55,533 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 20:12:55,533 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 20:12:55,533 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 20:12:55,533 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 20:12:55,533 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 20:12:55,534 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 20:12:55,534 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 20:12:55,776 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 20:12:55,777 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 20:12:55,778 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 08:12:55 BoogieIcfgContainer [2021-05-02 20:12:55,778 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 20:12:55,778 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 20:12:55,778 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 20:12:55,779 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 20:12:55,781 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 08:12:55" (1/1) ... [2021-05-02 20:12:55,796 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 08:12:55 BasicIcfg [2021-05-02 20:12:55,796 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 20:12:55,798 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 20:12:55,798 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 20:12:55,800 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 20:12:55,800 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 08:12:55" (1/4) ... [2021-05-02 20:12:55,801 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6815b15e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 08:12:55, skipping insertion in model container [2021-05-02 20:12:55,801 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 08:12:55" (2/4) ... [2021-05-02 20:12:55,801 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6815b15e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 08:12:55, skipping insertion in model container [2021-05-02 20:12:55,802 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 08:12:55" (3/4) ... [2021-05-02 20:12:55,802 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6815b15e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 08:12:55, skipping insertion in model container [2021-05-02 20:12:55,802 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 08:12:55" (4/4) ... [2021-05-02 20:12:55,803 INFO L111 eAbstractionObserver]: Analyzing ICFG divbin_unwindbound5.iJordan [2021-05-02 20:12:55,807 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 20:12:55,810 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 20:12:55,823 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 20:12:55,838 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 20:12:55,838 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 20:12:55,838 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 20:12:55,838 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 20:12:55,838 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 20:12:55,838 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 20:12:55,838 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 20:12:55,838 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 20:12:55,848 INFO L276 IsEmpty]: Start isEmpty. Operand has 33 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 20:12:55,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 20:12:55,853 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:12:55,854 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:12:55,854 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:12:55,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:12:55,858 INFO L82 PathProgramCache]: Analyzing trace with hash 35225450, now seen corresponding path program 1 times [2021-05-02 20:12:55,864 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:12:55,864 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [877591677] [2021-05-02 20:12:55,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:12:55,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:12:56,009 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 20:12:56,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:12:56,023 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 20:12:56,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:12:56,027 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 20:12:56,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:12:56,032 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 20:12:56,032 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:12:56,033 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [877591677] [2021-05-02 20:12:56,033 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [877591677] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:12:56,033 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:12:56,034 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 20:12:56,034 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1066341992] [2021-05-02 20:12:56,037 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 20:12:56,037 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:12:56,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 20:12:56,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 20:12:56,050 INFO L87 Difference]: Start difference. First operand has 33 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 20:12:56,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:12:56,117 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2021-05-02 20:12:56,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 20:12:56,118 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2021-05-02 20:12:56,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:12:56,124 INFO L225 Difference]: With dead ends: 34 [2021-05-02 20:12:56,124 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 20:12:56,125 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 26.3ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 20:12:56,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 20:12:56,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2021-05-02 20:12:56,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 20:12:56,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2021-05-02 20:12:56,152 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 23 [2021-05-02 20:12:56,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:12:56,153 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2021-05-02 20:12:56,153 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 20:12:56,153 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2021-05-02 20:12:56,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 20:12:56,154 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:12:56,154 INFO L523 BasicCegarLoop]: trace histogram [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 20:12:56,155 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 20:12:56,155 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:12:56,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:12:56,156 INFO L82 PathProgramCache]: Analyzing trace with hash 106385839, now seen corresponding path program 1 times [2021-05-02 20:12:56,156 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:12:56,156 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2122222397] [2021-05-02 20:12:56,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:12:56,176 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:12:56,176 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [294208751] [2021-05-02 20:12:56,177 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 20:12:56,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:12:56,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 20:12:56,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:12:56,393 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:56,402 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:56,404 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:56,466 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:56,472 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:56,495 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 20:12:56,496 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:12:56,496 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2122222397] [2021-05-02 20:12:56,496 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:12:56,497 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [294208751] [2021-05-02 20:12:56,497 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [294208751] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:12:56,497 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:12:56,497 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 20:12:56,497 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [635632745] [2021-05-02 20:12:56,499 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 20:12:56,499 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:12:56,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 20:12:56,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 20:12:56,508 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 20:12:56,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:12:56,521 INFO L93 Difference]: Finished difference Result 30 states and 36 transitions. [2021-05-02 20:12:56,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 20:12:56,522 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 25 [2021-05-02 20:12:56,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:12:56,527 INFO L225 Difference]: With dead ends: 30 [2021-05-02 20:12:56,527 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 20:12:56,528 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.8ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 20:12:56,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 20:12:56,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-05-02 20:12:56,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 20 states have (on average 1.3) internal successors, (26), 21 states have internal predecessors, (26), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 20:12:56,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2021-05-02 20:12:56,536 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 25 [2021-05-02 20:12:56,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:12:56,540 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2021-05-02 20:12:56,541 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 20:12:56,541 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2021-05-02 20:12:56,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 20:12:56,541 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:12:56,541 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:12:56,765 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 20:12:56,765 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:12:56,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:12:56,766 INFO L82 PathProgramCache]: Analyzing trace with hash 1662084126, now seen corresponding path program 1 times [2021-05-02 20:12:56,767 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:12:56,767 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [560442827] [2021-05-02 20:12:56,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:12:56,802 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:12:56,802 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [353467916] [2021-05-02 20:12:56,802 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 20:12:56,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:12:56,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 20:12:56,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:12:56,913 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:56,918 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:56,921 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:56,966 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:56,972 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:56,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:57,000 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:57,002 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:57,051 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 20:12:57,051 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:12:57,051 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [560442827] [2021-05-02 20:12:57,051 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:12:57,051 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [353467916] [2021-05-02 20:12:57,051 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [353467916] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:12:57,051 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:12:57,051 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 20:12:57,052 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1268366778] [2021-05-02 20:12:57,052 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 20:12:57,052 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:12:57,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 20:12:57,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 20:12:57,053 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 20:12:57,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:12:57,113 INFO L93 Difference]: Finished difference Result 34 states and 41 transitions. [2021-05-02 20:12:57,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 20:12:57,117 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 26 [2021-05-02 20:12:57,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:12:57,118 INFO L225 Difference]: With dead ends: 34 [2021-05-02 20:12:57,118 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 20:12:57,118 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 20.4ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 20:12:57,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 20:12:57,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2021-05-02 20:12:57,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 24 states have internal predecessors, (30), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 20:12:57,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 40 transitions. [2021-05-02 20:12:57,121 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 40 transitions. Word has length 26 [2021-05-02 20:12:57,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:12:57,122 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 40 transitions. [2021-05-02 20:12:57,122 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 20:12:57,122 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 40 transitions. [2021-05-02 20:12:57,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 20:12:57,122 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:12:57,122 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:12:57,348 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:12:57,349 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:12:57,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:12:57,349 INFO L82 PathProgramCache]: Analyzing trace with hash 1663216184, now seen corresponding path program 1 times [2021-05-02 20:12:57,349 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:12:57,349 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [872996816] [2021-05-02 20:12:57,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:12:57,369 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:12:57,369 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [182118994] [2021-05-02 20:12:57,370 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 20:12:57,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:12:57,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 20:12:57,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:12:57,482 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:57,484 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:57,552 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:57,558 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:57,586 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 20:12:57,587 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:12:57,587 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [872996816] [2021-05-02 20:12:57,587 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:12:57,587 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [182118994] [2021-05-02 20:12:57,587 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [182118994] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:12:57,587 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:12:57,588 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 20:12:57,588 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1382238686] [2021-05-02 20:12:57,590 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 20:12:57,590 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:12:57,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 20:12:57,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-02 20:12:57,591 INFO L87 Difference]: Start difference. First operand 33 states and 40 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 20:12:57,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:12:57,748 INFO L93 Difference]: Finished difference Result 43 states and 53 transitions. [2021-05-02 20:12:57,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 20:12:57,749 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 26 [2021-05-02 20:12:57,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:12:57,751 INFO L225 Difference]: With dead ends: 43 [2021-05-02 20:12:57,751 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 20:12:57,755 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 92.7ms TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-05-02 20:12:57,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 20:12:57,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2021-05-02 20:12:57,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 29 states have internal predecessors, (36), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 20:12:57,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2021-05-02 20:12:57,771 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 26 [2021-05-02 20:12:57,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:12:57,772 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2021-05-02 20:12:57,772 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 20:12:57,772 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2021-05-02 20:12:57,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 20:12:57,773 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:12:57,773 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, 1] [2021-05-02 20:12:57,977 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:12:57,977 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:12:57,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:12:57,977 INFO L82 PathProgramCache]: Analyzing trace with hash -1664227005, now seen corresponding path program 1 times [2021-05-02 20:12:57,978 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:12:57,978 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [687413635] [2021-05-02 20:12:57,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:12:57,992 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:12:57,992 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [274046861] [2021-05-02 20:12:57,992 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 20:12:58,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:12:58,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 20:12:58,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:12:58,111 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:58,118 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:58,120 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:58,147 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:58,156 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:58,157 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:58,176 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:58,178 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:58,192 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 20:12:58,193 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:12:58,193 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [687413635] [2021-05-02 20:12:58,193 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:12:58,193 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [274046861] [2021-05-02 20:12:58,193 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [274046861] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:12:58,193 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:12:58,193 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-02 20:12:58,193 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163707840] [2021-05-02 20:12:58,194 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 20:12:58,194 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:12:58,194 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 20:12:58,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 20:12:58,194 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 20:12:58,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:12:58,223 INFO L93 Difference]: Finished difference Result 43 states and 51 transitions. [2021-05-02 20:12:58,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 20:12:58,223 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 28 [2021-05-02 20:12:58,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:12:58,225 INFO L225 Difference]: With dead ends: 43 [2021-05-02 20:12:58,225 INFO L226 Difference]: Without dead ends: 43 [2021-05-02 20:12:58,225 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 13.8ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:12:58,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-02 20:12:58,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2021-05-02 20:12:58,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 31 states have internal predecessors, (38), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 20:12:58,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2021-05-02 20:12:58,235 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 28 [2021-05-02 20:12:58,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:12:58,235 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2021-05-02 20:12:58,236 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 20:12:58,236 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2021-05-02 20:12:58,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 20:12:58,237 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:12:58,237 INFO L523 BasicCegarLoop]: trace histogram [2, 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 20:12:58,459 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:12:58,460 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:12:58,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:12:58,460 INFO L82 PathProgramCache]: Analyzing trace with hash -1687306486, now seen corresponding path program 1 times [2021-05-02 20:12:58,460 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:12:58,460 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1943544161] [2021-05-02 20:12:58,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:12:58,471 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:12:58,471 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1475797930] [2021-05-02 20:12:58,471 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 20:12:58,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:12:58,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 20:12:58,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:12:58,546 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:58,548 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:58,549 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:58,570 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:58,572 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:58,578 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:58,591 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:58,593 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:58,593 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:58,603 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:58,605 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:58,615 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 20:12:58,615 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:12:58,616 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1943544161] [2021-05-02 20:12:58,616 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:12:58,616 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1475797930] [2021-05-02 20:12:58,616 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1475797930] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:12:58,616 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:12:58,616 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 20:12:58,616 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [392482355] [2021-05-02 20:12:58,616 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 20:12:58,616 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:12:58,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 20:12:58,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:12:58,617 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 20:12:58,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:12:58,658 INFO L93 Difference]: Finished difference Result 57 states and 67 transitions. [2021-05-02 20:12:58,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 20:12:58,659 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2021-05-02 20:12:58,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:12:58,659 INFO L225 Difference]: With dead ends: 57 [2021-05-02 20:12:58,659 INFO L226 Difference]: Without dead ends: 57 [2021-05-02 20:12:58,660 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 18.8ms TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-05-02 20:12:58,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-02 20:12:58,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2021-05-02 20:12:58,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 40 states have (on average 1.25) internal successors, (50), 41 states have internal predecessors, (50), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 20:12:58,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 64 transitions. [2021-05-02 20:12:58,663 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 64 transitions. Word has length 29 [2021-05-02 20:12:58,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:12:58,663 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 64 transitions. [2021-05-02 20:12:58,663 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 20:12:58,663 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 64 transitions. [2021-05-02 20:12:58,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 20:12:58,663 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:12:58,664 INFO L523 BasicCegarLoop]: trace histogram [2, 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 20:12:58,879 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-02 20:12:58,879 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:12:58,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:12:58,880 INFO L82 PathProgramCache]: Analyzing trace with hash -1686174428, now seen corresponding path program 1 times [2021-05-02 20:12:58,880 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:12:58,880 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [77536734] [2021-05-02 20:12:58,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:12:58,889 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:12:58,889 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1200020754] [2021-05-02 20:12:58,889 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) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:12:58,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:12:58,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 20:12:58,985 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:12:59,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:59,020 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:59,069 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:59,073 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:59,113 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:59,115 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:59,137 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 20:12:59,137 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:12:59,137 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [77536734] [2021-05-02 20:12:59,137 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:12:59,137 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1200020754] [2021-05-02 20:12:59,137 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1200020754] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:12:59,137 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:12:59,137 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 20:12:59,137 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [224874273] [2021-05-02 20:12:59,138 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 20:12:59,138 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:12:59,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 20:12:59,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-05-02 20:12:59,138 INFO L87 Difference]: Start difference. First operand 54 states and 64 transitions. Second operand has 10 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 20:12:59,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:12:59,286 INFO L93 Difference]: Finished difference Result 67 states and 80 transitions. [2021-05-02 20:12:59,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 20:12:59,287 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2021-05-02 20:12:59,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:12:59,287 INFO L225 Difference]: With dead ends: 67 [2021-05-02 20:12:59,287 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 20:12:59,288 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 123.7ms TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-02 20:12:59,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 20:12:59,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 53. [2021-05-02 20:12:59,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 40 states have internal predecessors, (48), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 20:12:59,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 62 transitions. [2021-05-02 20:12:59,290 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 62 transitions. Word has length 29 [2021-05-02 20:12:59,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:12:59,291 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 62 transitions. [2021-05-02 20:12:59,291 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 20:12:59,291 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 62 transitions. [2021-05-02 20:12:59,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 20:12:59,291 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:12:59,291 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:12:59,508 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:12:59,509 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:12:59,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:12:59,509 INFO L82 PathProgramCache]: Analyzing trace with hash -1552566600, now seen corresponding path program 1 times [2021-05-02 20:12:59,509 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:12:59,509 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1696632424] [2021-05-02 20:12:59,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:12:59,517 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:12:59,517 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [502626165] [2021-05-02 20:12:59,517 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 20:12:59,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:12:59,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 20:12:59,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:12:59,613 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 20:12:59,613 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:12:59,613 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1696632424] [2021-05-02 20:12:59,613 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:12:59,613 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [502626165] [2021-05-02 20:12:59,613 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [502626165] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:12:59,613 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:12:59,613 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 20:12:59,613 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2145801546] [2021-05-02 20:12:59,613 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 20:12:59,614 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:12:59,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 20:12:59,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 20:12:59,614 INFO L87 Difference]: Start difference. First operand 53 states and 62 transitions. Second operand has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 20:12:59,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:12:59,624 INFO L93 Difference]: Finished difference Result 50 states and 57 transitions. [2021-05-02 20:12:59,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 20:12:59,624 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 35 [2021-05-02 20:12:59,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:12:59,625 INFO L225 Difference]: With dead ends: 50 [2021-05-02 20:12:59,625 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 20:12:59,625 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 20:12:59,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 20:12:59,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-05-02 20:12:59,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.2333333333333334) internal successors, (37), 31 states have internal predecessors, (37), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 20:12:59,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 49 transitions. [2021-05-02 20:12:59,627 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 49 transitions. Word has length 35 [2021-05-02 20:12:59,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:12:59,646 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 49 transitions. [2021-05-02 20:12:59,646 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 20:12:59,646 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 49 transitions. [2021-05-02 20:12:59,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 20:12:59,647 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:12:59,647 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:12:59,862 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:12:59,862 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:12:59,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:12:59,863 INFO L82 PathProgramCache]: Analyzing trace with hash 402759474, now seen corresponding path program 1 times [2021-05-02 20:12:59,863 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:12:59,863 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [612674594] [2021-05-02 20:12:59,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:12:59,875 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:12:59,875 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1823643512] [2021-05-02 20:12:59,875 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 20:12:59,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:12:59,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 20:12:59,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:12:59,938 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:59,939 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:59,940 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:59,961 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:59,962 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:59,963 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:59,970 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:59,971 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:59,973 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:59,981 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:59,982 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:12:59,982 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:00,003 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:00,004 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:00,013 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 20:13:00,013 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:13:00,013 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [612674594] [2021-05-02 20:13:00,013 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:13:00,014 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1823643512] [2021-05-02 20:13:00,014 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1823643512] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:13:00,014 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:13:00,014 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 20:13:00,014 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [183244621] [2021-05-02 20:13:00,014 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 20:13:00,014 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:13:00,014 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 20:13:00,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 20:13:00,015 INFO L87 Difference]: Start difference. First operand 42 states and 49 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 20:13:00,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:13:00,058 INFO L93 Difference]: Finished difference Result 60 states and 71 transitions. [2021-05-02 20:13:00,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 20:13:00,058 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 38 [2021-05-02 20:13:00,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:13:00,059 INFO L225 Difference]: With dead ends: 60 [2021-05-02 20:13:00,059 INFO L226 Difference]: Without dead ends: 60 [2021-05-02 20:13:00,059 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 20.7ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 20:13:00,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-02 20:13:00,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 54. [2021-05-02 20:13:00,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 40 states have (on average 1.225) internal successors, (49), 41 states have internal predecessors, (49), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 20:13:00,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 63 transitions. [2021-05-02 20:13:00,062 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 63 transitions. Word has length 38 [2021-05-02 20:13:00,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:13:00,062 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 63 transitions. [2021-05-02 20:13:00,062 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 20:13:00,062 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 63 transitions. [2021-05-02 20:13:00,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 20:13:00,063 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:13:00,063 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:13:00,278 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-05-02 20:13:00,278 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:13:00,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:13:00,278 INFO L82 PathProgramCache]: Analyzing trace with hash 403891532, now seen corresponding path program 1 times [2021-05-02 20:13:00,278 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:13:00,278 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1721750081] [2021-05-02 20:13:00,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:13:00,286 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:13:00,286 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [804999699] [2021-05-02 20:13:00,286 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 20:13:00,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:13:00,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 20:13:00,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:13:00,448 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:00,451 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:00,490 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:00,493 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:00,575 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:00,580 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:00,596 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:00,599 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:00,773 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:00,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:01,503 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 20:13:01,503 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:13:01,503 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1721750081] [2021-05-02 20:13:01,503 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:13:01,503 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [804999699] [2021-05-02 20:13:01,503 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [804999699] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:13:01,503 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:13:01,503 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-02 20:13:01,503 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272766148] [2021-05-02 20:13:01,504 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 20:13:01,504 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:13:01,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 20:13:01,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2021-05-02 20:13:01,504 INFO L87 Difference]: Start difference. First operand 54 states and 63 transitions. Second operand has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 10 states have internal predecessors, (25), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 20:13:01,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:13:01,931 INFO L93 Difference]: Finished difference Result 77 states and 93 transitions. [2021-05-02 20:13:01,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 20:13:01,931 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 10 states have internal predecessors, (25), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 38 [2021-05-02 20:13:01,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:13:01,932 INFO L225 Difference]: With dead ends: 77 [2021-05-02 20:13:01,932 INFO L226 Difference]: Without dead ends: 76 [2021-05-02 20:13:01,932 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 422.1ms TimeCoverageRelationStatistics Valid=97, Invalid=409, Unknown=0, NotChecked=0, Total=506 [2021-05-02 20:13:01,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-02 20:13:01,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 63. [2021-05-02 20:13:01,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 46 states have (on average 1.1956521739130435) internal successors, (55), 48 states have internal predecessors, (55), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 20:13:01,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 73 transitions. [2021-05-02 20:13:01,935 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 73 transitions. Word has length 38 [2021-05-02 20:13:01,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:13:01,936 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 73 transitions. [2021-05-02 20:13:01,936 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 10 states have internal predecessors, (25), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 20:13:01,936 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 73 transitions. [2021-05-02 20:13:01,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 20:13:01,936 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:13:01,936 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:13:02,140 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:13:02,140 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:13:02,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:13:02,141 INFO L82 PathProgramCache]: Analyzing trace with hash -711541075, now seen corresponding path program 1 times [2021-05-02 20:13:02,141 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:13:02,141 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [17313533] [2021-05-02 20:13:02,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:13:02,149 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:13:02,149 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [401542309] [2021-05-02 20:13:02,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:13:02,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:13:02,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 20:13:02,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:13:02,221 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:02,222 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:02,223 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:02,239 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:02,240 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:02,240 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:02,249 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:02,251 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:02,252 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:02,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:02,262 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:02,283 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-05-02 20:13:02,284 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:13:02,284 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [17313533] [2021-05-02 20:13:02,284 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:13:02,284 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [401542309] [2021-05-02 20:13:02,284 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [401542309] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:13:02,284 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:13:02,284 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 20:13:02,284 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [144901322] [2021-05-02 20:13:02,285 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 20:13:02,285 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:13:02,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 20:13:02,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:13:02,285 INFO L87 Difference]: Start difference. First operand 63 states and 73 transitions. Second operand has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 states have internal predecessors, (25), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 20:13:02,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:13:02,320 INFO L93 Difference]: Finished difference Result 65 states and 75 transitions. [2021-05-02 20:13:02,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 20:13:02,320 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 states have internal predecessors, (25), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 40 [2021-05-02 20:13:02,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:13:02,322 INFO L225 Difference]: With dead ends: 65 [2021-05-02 20:13:02,322 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 20:13:02,322 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 22.1ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-02 20:13:02,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 20:13:02,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2021-05-02 20:13:02,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 48 states have (on average 1.1875) internal successors, (57), 50 states have internal predecessors, (57), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 20:13:02,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 75 transitions. [2021-05-02 20:13:02,326 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 75 transitions. Word has length 40 [2021-05-02 20:13:02,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:13:02,326 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 75 transitions. [2021-05-02 20:13:02,326 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 states have internal predecessors, (25), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 20:13:02,327 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 75 transitions. [2021-05-02 20:13:02,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 20:13:02,327 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:13:02,327 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:13:02,549 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:13:02,549 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:13:02,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:13:02,550 INFO L82 PathProgramCache]: Analyzing trace with hash 915639449, now seen corresponding path program 2 times [2021-05-02 20:13:02,550 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:13:02,550 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [512240151] [2021-05-02 20:13:02,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:13:02,576 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:13:02,579 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [982964624] [2021-05-02 20:13:02,579 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 20:13:02,658 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 20:13:02,659 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:13:02,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 20:13:02,662 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:13:02,686 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:02,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:02,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:02,708 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:02,709 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:02,710 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:02,718 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:02,720 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:02,720 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:02,730 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:02,731 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:02,732 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:02,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:02,742 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:02,760 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-05-02 20:13:02,760 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:13:02,760 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [512240151] [2021-05-02 20:13:02,760 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:13:02,760 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [982964624] [2021-05-02 20:13:02,760 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [982964624] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:13:02,760 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:13:02,760 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 20:13:02,760 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [107645855] [2021-05-02 20:13:02,761 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 20:13:02,761 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:13:02,761 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 20:13:02,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 20:13:02,761 INFO L87 Difference]: Start difference. First operand 65 states and 75 transitions. Second operand has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 20:13:02,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:13:02,810 INFO L93 Difference]: Finished difference Result 72 states and 84 transitions. [2021-05-02 20:13:02,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 20:13:02,810 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 43 [2021-05-02 20:13:02,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:13:02,811 INFO L225 Difference]: With dead ends: 72 [2021-05-02 20:13:02,811 INFO L226 Difference]: Without dead ends: 72 [2021-05-02 20:13:02,811 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 48.1ms TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-05-02 20:13:02,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-02 20:13:02,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 68. [2021-05-02 20:13:02,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 51 states have (on average 1.196078431372549) internal successors, (61), 53 states have internal predecessors, (61), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 20:13:02,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 79 transitions. [2021-05-02 20:13:02,815 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 79 transitions. Word has length 43 [2021-05-02 20:13:02,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:13:02,815 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 79 transitions. [2021-05-02 20:13:02,815 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 20:13:02,815 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 79 transitions. [2021-05-02 20:13:02,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 20:13:02,816 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:13:02,816 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 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 20:13:03,032 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-02 20:13:03,033 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:13:03,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:13:03,033 INFO L82 PathProgramCache]: Analyzing trace with hash -1272338613, now seen corresponding path program 1 times [2021-05-02 20:13:03,034 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:13:03,034 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [426811911] [2021-05-02 20:13:03,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:13:03,049 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:13:03,049 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1828442479] [2021-05-02 20:13:03,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 20:13:03,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:13:03,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 20:13:03,127 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:13:03,136 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:03,137 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:03,138 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:03,157 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:03,159 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:03,159 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:03,168 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:03,169 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:03,170 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:03,179 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:03,181 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:03,181 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:03,200 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:03,201 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:03,202 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:03,221 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:03,223 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:03,234 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 20:13:03,234 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:13:03,234 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [426811911] [2021-05-02 20:13:03,234 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:13:03,234 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1828442479] [2021-05-02 20:13:03,234 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1828442479] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:13:03,235 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:13:03,235 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 20:13:03,235 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [731381635] [2021-05-02 20:13:03,235 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 20:13:03,235 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:13:03,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 20:13:03,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 20:13:03,236 INFO L87 Difference]: Start difference. First operand 68 states and 79 transitions. Second operand has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 20:13:03,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:13:03,290 INFO L93 Difference]: Finished difference Result 96 states and 111 transitions. [2021-05-02 20:13:03,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 20:13:03,290 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) Word has length 47 [2021-05-02 20:13:03,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:13:03,291 INFO L225 Difference]: With dead ends: 96 [2021-05-02 20:13:03,291 INFO L226 Difference]: Without dead ends: 96 [2021-05-02 20:13:03,292 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 36.2ms TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-05-02 20:13:03,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-05-02 20:13:03,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 88. [2021-05-02 20:13:03,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 67 states have (on average 1.1791044776119404) internal successors, (79), 69 states have internal predecessors, (79), 12 states have call successors, (12), 9 states have call predecessors, (12), 8 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 20:13:03,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 101 transitions. [2021-05-02 20:13:03,295 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 101 transitions. Word has length 47 [2021-05-02 20:13:03,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:13:03,295 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 101 transitions. [2021-05-02 20:13:03,296 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 20:13:03,296 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 101 transitions. [2021-05-02 20:13:03,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 20:13:03,296 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:13:03,296 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:13:03,519 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 20:13:03,519 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:13:03,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:13:03,520 INFO L82 PathProgramCache]: Analyzing trace with hash -1271206555, now seen corresponding path program 1 times [2021-05-02 20:13:03,520 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:13:03,520 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1504002297] [2021-05-02 20:13:03,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:13:03,527 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:13:03,527 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [35338533] [2021-05-02 20:13:03,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:13:03,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 20:13:03,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 20:13:03,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:13:03,755 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:03,756 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:03,892 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:03,897 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:03,952 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:03,956 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:04,210 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:04,228 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:04,511 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:04,596 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 11 proven. 7 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-05-02 20:13:04,596 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:13:04,596 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1504002297] [2021-05-02 20:13:04,596 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:13:04,596 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [35338533] [2021-05-02 20:13:04,596 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [35338533] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 20:13:04,596 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 20:13:04,596 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 20:13:04,597 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648041316] [2021-05-02 20:13:04,597 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 20:13:04,597 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:13:04,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 20:13:04,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2021-05-02 20:13:04,598 INFO L87 Difference]: Start difference. First operand 88 states and 101 transitions. Second operand has 11 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 20:13:05,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:13:05,017 INFO L93 Difference]: Finished difference Result 85 states and 95 transitions. [2021-05-02 20:13:05,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 20:13:05,018 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) Word has length 47 [2021-05-02 20:13:05,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:13:05,018 INFO L225 Difference]: With dead ends: 85 [2021-05-02 20:13:05,018 INFO L226 Difference]: Without dead ends: 68 [2021-05-02 20:13:05,019 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 274.8ms TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-05-02 20:13:05,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-05-02 20:13:05,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-05-02 20:13:05,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 51 states have (on average 1.1764705882352942) internal successors, (60), 53 states have internal predecessors, (60), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 20:13:05,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 78 transitions. [2021-05-02 20:13:05,022 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 78 transitions. Word has length 47 [2021-05-02 20:13:05,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:13:05,022 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 78 transitions. [2021-05-02 20:13:05,022 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 20:13:05,022 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 78 transitions. [2021-05-02 20:13:05,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 20:13:05,023 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:13:05,023 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 20:13:05,227 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 20:13:05,227 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:13:05,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:13:05,228 INFO L82 PathProgramCache]: Analyzing trace with hash -1045240019, now seen corresponding path program 3 times [2021-05-02 20:13:05,228 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:13:05,228 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2071221061] [2021-05-02 20:13:05,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:13:05,235 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:13:05,236 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1833955159] [2021-05-02 20:13:05,236 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:13:05,302 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 20:13:05,302 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:13:05,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 20:13:05,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:13:05,349 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:05,351 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:05,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:05,360 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:05,382 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 20:13:05,382 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 20:13:05,382 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2071221061] [2021-05-02 20:13:05,382 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 20:13:05,383 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1833955159] [2021-05-02 20:13:05,383 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1833955159] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 20:13:05,383 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 20:13:05,383 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 20:13:05,383 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1734878799] [2021-05-02 20:13:05,383 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 20:13:05,383 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 20:13:05,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 20:13:05,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 20:13:05,384 INFO L87 Difference]: Start difference. First operand 68 states and 78 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 20:13:05,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 20:13:05,405 INFO L93 Difference]: Finished difference Result 65 states and 72 transitions. [2021-05-02 20:13:05,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 20:13:05,406 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 46 [2021-05-02 20:13:05,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 20:13:05,406 INFO L225 Difference]: With dead ends: 65 [2021-05-02 20:13:05,406 INFO L226 Difference]: Without dead ends: 63 [2021-05-02 20:13:05,407 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 17.4ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 20:13:05,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-02 20:13:05,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 51. [2021-05-02 20:13:05,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 37 states have (on average 1.162162162162162) internal successors, (43), 38 states have internal predecessors, (43), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 20:13:05,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 57 transitions. [2021-05-02 20:13:05,409 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 57 transitions. Word has length 46 [2021-05-02 20:13:05,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 20:13:05,409 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 57 transitions. [2021-05-02 20:13:05,409 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 20:13:05,409 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 57 transitions. [2021-05-02 20:13:05,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 20:13:05,410 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 20:13:05,410 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 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 20:13:05,633 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 20:13:05,633 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 20:13:05,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 20:13:05,633 INFO L82 PathProgramCache]: Analyzing trace with hash -1808689185, now seen corresponding path program 2 times [2021-05-02 20:13:05,634 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 20:13:05,634 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [934327933] [2021-05-02 20:13:05,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 20:13:05,641 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 20:13:05,641 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1202220307] [2021-05-02 20:13:05,642 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 20:13:07,784 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 20:13:07,784 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 20:13:07,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 44 conjunts are in the unsatisfiable core [2021-05-02 20:13:07,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 20:13:07,817 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:07,818 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:10,133 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:10,141 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:10,457 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 24 [2021-05-02 20:13:10,780 WARN L205 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 25 [2021-05-02 20:13:10,874 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:10,888 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:11,830 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:13,341 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:13,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:13,379 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 20:13:13,402 WARN L159 QuantifierPusher]: Ignoring assumption.