/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/loops-crafted-1/mono-crafted_11.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-dcfa08f [2020-12-23 07:06:07,305 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-23 07:06:07,310 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-23 07:06:07,368 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-23 07:06:07,369 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-23 07:06:07,374 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-23 07:06:07,379 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-23 07:06:07,385 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-23 07:06:07,389 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-23 07:06:07,395 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-23 07:06:07,400 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-23 07:06:07,401 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-23 07:06:07,402 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-23 07:06:07,405 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-23 07:06:07,407 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-23 07:06:07,409 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-23 07:06:07,422 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-23 07:06:07,424 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-23 07:06:07,431 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-23 07:06:07,437 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-23 07:06:07,440 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-23 07:06:07,441 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-23 07:06:07,442 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-23 07:06:07,445 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-23 07:06:07,454 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-23 07:06:07,460 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-23 07:06:07,461 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-23 07:06:07,463 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-23 07:06:07,464 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-23 07:06:07,465 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-23 07:06:07,465 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-23 07:06:07,466 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-23 07:06:07,470 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-23 07:06:07,471 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-23 07:06:07,472 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-23 07:06:07,473 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-23 07:06:07,476 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-23 07:06:07,527 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-23 07:06:07,527 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-23 07:06:07,532 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-23 07:06:07,532 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-23 07:06:07,533 INFO L138 SettingsManager]: * Use SBE=true [2020-12-23 07:06:07,533 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-23 07:06:07,533 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-23 07:06:07,533 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-23 07:06:07,534 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-23 07:06:07,534 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-23 07:06:07,535 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-23 07:06:07,535 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-23 07:06:07,536 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-23 07:06:07,536 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-23 07:06:07,536 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-23 07:06:07,536 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-23 07:06:07,537 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-23 07:06:07,537 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-23 07:06:07,537 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-23 07:06:07,537 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-23 07:06:07,538 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-23 07:06:07,538 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-23 07:06:07,538 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-23 07:06:07,538 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-23 07:06:07,538 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-23 07:06:07,539 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate-bitabs/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-23 07:06:08,016 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-23 07:06:08,047 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-23 07:06:08,050 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-23 07:06:08,051 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-23 07:06:08,052 INFO L275 PluginConnector]: CDTParser initialized [2020-12-23 07:06:08,053 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loops-crafted-1/mono-crafted_11.c [2020-12-23 07:06:08,147 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/aa2f51a5e/3e9eb102ee9542089881cdf19e612325/FLAGeda7af53e [2020-12-23 07:06:08,889 INFO L306 CDTParser]: Found 1 translation units. [2020-12-23 07:06:08,889 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/loops-crafted-1/mono-crafted_11.c [2020-12-23 07:06:08,897 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/aa2f51a5e/3e9eb102ee9542089881cdf19e612325/FLAGeda7af53e [2020-12-23 07:06:09,250 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/aa2f51a5e/3e9eb102ee9542089881cdf19e612325 [2020-12-23 07:06:09,254 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-23 07:06:09,256 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-23 07:06:09,258 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-23 07:06:09,258 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-23 07:06:09,263 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-23 07:06:09,264 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 07:06:09" (1/1) ... [2020-12-23 07:06:09,265 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@71f7334c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:06:09, skipping insertion in model container [2020-12-23 07:06:09,265 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 07:06:09" (1/1) ... [2020-12-23 07:06:09,274 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-23 07:06:09,288 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-23 07:06:09,450 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/loops-crafted-1/mono-crafted_11.c[319,332] [2020-12-23 07:06:09,464 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 07:06:09,475 INFO L203 MainTranslator]: Completed pre-run [2020-12-23 07:06:09,488 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/loops-crafted-1/mono-crafted_11.c[319,332] [2020-12-23 07:06:09,491 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 07:06:09,507 INFO L208 MainTranslator]: Completed translation [2020-12-23 07:06:09,508 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:06:09 WrapperNode [2020-12-23 07:06:09,508 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-23 07:06:09,510 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-23 07:06:09,510 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-23 07:06:09,510 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-23 07:06:09,519 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:06:09" (1/1) ... [2020-12-23 07:06:09,527 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:06:09" (1/1) ... [2020-12-23 07:06:09,546 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-23 07:06:09,547 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-23 07:06:09,548 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-23 07:06:09,548 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-23 07:06:09,557 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:06:09" (1/1) ... [2020-12-23 07:06:09,557 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:06:09" (1/1) ... [2020-12-23 07:06:09,559 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:06:09" (1/1) ... [2020-12-23 07:06:09,559 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:06:09" (1/1) ... [2020-12-23 07:06:09,562 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:06:09" (1/1) ... [2020-12-23 07:06:09,567 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:06:09" (1/1) ... [2020-12-23 07:06:09,568 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:06:09" (1/1) ... [2020-12-23 07:06:09,570 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-23 07:06:09,571 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-23 07:06:09,571 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-23 07:06:09,572 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-23 07:06:09,573 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:06:09" (1/1) ... No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 07:06:09,679 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-23 07:06:09,679 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-23 07:06:09,679 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-23 07:06:09,679 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-23 07:06:09,967 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-23 07:06:09,968 INFO L299 CfgBuilder]: Removed 7 assume(true) statements. [2020-12-23 07:06:09,973 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 07:06:09 BoogieIcfgContainer [2020-12-23 07:06:09,973 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-23 07:06:09,976 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-23 07:06:09,976 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-23 07:06:09,981 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-23 07:06:09,983 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.12 07:06:09" (1/3) ... [2020-12-23 07:06:09,984 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5adf8571 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 07:06:09, skipping insertion in model container [2020-12-23 07:06:09,985 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:06:09" (2/3) ... [2020-12-23 07:06:09,986 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5adf8571 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 07:06:09, skipping insertion in model container [2020-12-23 07:06:09,986 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 07:06:09" (3/3) ... [2020-12-23 07:06:09,988 INFO L111 eAbstractionObserver]: Analyzing ICFG mono-crafted_11.c [2020-12-23 07:06:09,997 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-23 07:06:10,002 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-23 07:06:10,029 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-23 07:06:10,093 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-23 07:06:10,094 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-23 07:06:10,094 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-23 07:06:10,094 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-23 07:06:10,094 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-23 07:06:10,094 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-23 07:06:10,094 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-23 07:06:10,095 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-23 07:06:10,113 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states. [2020-12-23 07:06:10,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-12-23 07:06:10,120 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:06:10,121 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-12-23 07:06:10,122 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:06:10,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:06:10,130 INFO L82 PathProgramCache]: Analyzing trace with hash 889937703, now seen corresponding path program 1 times [2020-12-23 07:06:10,141 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:06:10,142 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [143564455] [2020-12-23 07:06:10,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:06:10,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:10,362 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 07:06:10,364 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [143564455] [2020-12-23 07:06:10,365 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 07:06:10,366 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-23 07:06:10,367 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [789920710] [2020-12-23 07:06:10,372 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-12-23 07:06:10,372 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:06:10,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-12-23 07:06:10,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-12-23 07:06:10,397 INFO L87 Difference]: Start difference. First operand 12 states. Second operand 2 states. [2020-12-23 07:06:10,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:06:10,417 INFO L93 Difference]: Finished difference Result 20 states and 23 transitions. [2020-12-23 07:06:10,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-12-23 07:06:10,418 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 6 [2020-12-23 07:06:10,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:06:10,440 INFO L225 Difference]: With dead ends: 20 [2020-12-23 07:06:10,440 INFO L226 Difference]: Without dead ends: 8 [2020-12-23 07:06:10,443 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-12-23 07:06:10,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2020-12-23 07:06:10,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2020-12-23 07:06:10,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2020-12-23 07:06:10,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2020-12-23 07:06:10,484 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 6 [2020-12-23 07:06:10,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:06:10,485 INFO L481 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2020-12-23 07:06:10,485 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-12-23 07:06:10,486 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2020-12-23 07:06:10,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-12-23 07:06:10,486 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:06:10,486 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-12-23 07:06:10,488 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-23 07:06:10,488 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:06:10,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:06:10,491 INFO L82 PathProgramCache]: Analyzing trace with hash 889639793, now seen corresponding path program 1 times [2020-12-23 07:06:10,492 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:06:10,493 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [289343269] [2020-12-23 07:06:10,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:06:10,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:10,684 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 07:06:10,685 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [289343269] [2020-12-23 07:06:10,685 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 07:06:10,686 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-23 07:06:10,686 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154914986] [2020-12-23 07:06:10,691 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-23 07:06:10,691 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:06:10,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-23 07:06:10,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-23 07:06:10,696 INFO L87 Difference]: Start difference. First operand 8 states and 9 transitions. Second operand 3 states. [2020-12-23 07:06:10,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:06:10,743 INFO L93 Difference]: Finished difference Result 16 states and 20 transitions. [2020-12-23 07:06:10,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-23 07:06:10,744 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 6 [2020-12-23 07:06:10,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:06:10,744 INFO L225 Difference]: With dead ends: 16 [2020-12-23 07:06:10,744 INFO L226 Difference]: Without dead ends: 10 [2020-12-23 07:06:10,745 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-23 07:06:10,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2020-12-23 07:06:10,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2020-12-23 07:06:10,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2020-12-23 07:06:10,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 11 transitions. [2020-12-23 07:06:10,751 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 11 transitions. Word has length 6 [2020-12-23 07:06:10,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:06:10,751 INFO L481 AbstractCegarLoop]: Abstraction has 10 states and 11 transitions. [2020-12-23 07:06:10,752 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-23 07:06:10,752 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 11 transitions. [2020-12-23 07:06:10,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-12-23 07:06:10,752 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:06:10,752 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 07:06:10,753 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-23 07:06:10,753 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:06:10,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:06:10,755 INFO L82 PathProgramCache]: Analyzing trace with hash 295691924, now seen corresponding path program 1 times [2020-12-23 07:06:10,756 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:06:10,756 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1228998442] [2020-12-23 07:06:10,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:06:10,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:10,892 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 07:06:10,893 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1228998442] [2020-12-23 07:06:10,893 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1216852516] [2020-12-23 07:06:10,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 07:06:10,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:10,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-23 07:06:10,964 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:06:10,996 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 07:06:10,996 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:06:10,997 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-23 07:06:10,997 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [728125659] [2020-12-23 07:06:10,998 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-23 07:06:10,998 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:06:10,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-23 07:06:10,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-12-23 07:06:10,999 INFO L87 Difference]: Start difference. First operand 10 states and 11 transitions. Second operand 5 states. [2020-12-23 07:06:11,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:06:11,033 INFO L93 Difference]: Finished difference Result 18 states and 22 transitions. [2020-12-23 07:06:11,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-23 07:06:11,034 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 8 [2020-12-23 07:06:11,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:06:11,035 INFO L225 Difference]: With dead ends: 18 [2020-12-23 07:06:11,035 INFO L226 Difference]: Without dead ends: 12 [2020-12-23 07:06:11,036 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-12-23 07:06:11,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-12-23 07:06:11,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-12-23 07:06:11,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-12-23 07:06:11,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2020-12-23 07:06:11,040 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 8 [2020-12-23 07:06:11,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:06:11,040 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2020-12-23 07:06:11,040 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-23 07:06:11,040 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2020-12-23 07:06:11,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-23 07:06:11,041 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:06:11,041 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1] [2020-12-23 07:06:11,254 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-12-23 07:06:11,255 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:06:11,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:06:11,256 INFO L82 PathProgramCache]: Analyzing trace with hash 742440183, now seen corresponding path program 2 times [2020-12-23 07:06:11,257 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:06:11,257 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [998790327] [2020-12-23 07:06:11,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:06:11,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:11,419 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 07:06:11,420 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [998790327] [2020-12-23 07:06:11,420 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1658663832] [2020-12-23 07:06:11,420 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 07:06:11,489 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 07:06:11,490 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:06:11,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-23 07:06:11,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:06:11,562 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 07:06:11,562 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:06:11,563 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-12-23 07:06:11,563 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [767947250] [2020-12-23 07:06:11,564 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-23 07:06:11,564 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:06:11,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-23 07:06:11,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-12-23 07:06:11,566 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand 6 states. [2020-12-23 07:06:11,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:06:11,608 INFO L93 Difference]: Finished difference Result 20 states and 24 transitions. [2020-12-23 07:06:11,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-23 07:06:11,608 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2020-12-23 07:06:11,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:06:11,609 INFO L225 Difference]: With dead ends: 20 [2020-12-23 07:06:11,609 INFO L226 Difference]: Without dead ends: 14 [2020-12-23 07:06:11,610 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-12-23 07:06:11,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-12-23 07:06:11,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-12-23 07:06:11,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-12-23 07:06:11,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2020-12-23 07:06:11,615 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2020-12-23 07:06:11,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:06:11,615 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2020-12-23 07:06:11,615 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-23 07:06:11,615 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2020-12-23 07:06:11,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-12-23 07:06:11,616 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:06:11,616 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1] [2020-12-23 07:06:11,829 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:06:11,830 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:06:11,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:06:11,832 INFO L82 PathProgramCache]: Analyzing trace with hash 570787482, now seen corresponding path program 3 times [2020-12-23 07:06:11,832 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:06:11,833 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [809255231] [2020-12-23 07:06:11,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:06:11,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:11,931 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 07:06:11,931 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [809255231] [2020-12-23 07:06:11,931 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [130140570] [2020-12-23 07:06:11,932 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 07:06:11,973 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2020-12-23 07:06:11,974 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:06:11,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-23 07:06:11,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:06:12,020 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-12-23 07:06:12,021 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-12-23 07:06:12,021 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2020-12-23 07:06:12,021 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [300848812] [2020-12-23 07:06:12,022 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-23 07:06:12,022 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:06:12,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-23 07:06:12,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2020-12-23 07:06:12,023 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 3 states. [2020-12-23 07:06:12,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:06:12,040 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-12-23 07:06:12,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-23 07:06:12,041 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2020-12-23 07:06:12,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:06:12,042 INFO L225 Difference]: With dead ends: 20 [2020-12-23 07:06:12,042 INFO L226 Difference]: Without dead ends: 16 [2020-12-23 07:06:12,042 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2020-12-23 07:06:12,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-12-23 07:06:12,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-12-23 07:06:12,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-12-23 07:06:12,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-12-23 07:06:12,047 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 12 [2020-12-23 07:06:12,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:06:12,047 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-12-23 07:06:12,048 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-23 07:06:12,048 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-12-23 07:06:12,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-12-23 07:06:12,048 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:06:12,049 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 07:06:12,263 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:06:12,264 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:06:12,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:06:12,265 INFO L82 PathProgramCache]: Analyzing trace with hash -1176853889, now seen corresponding path program 1 times [2020-12-23 07:06:12,266 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:06:12,266 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [123674602] [2020-12-23 07:06:12,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:06:12,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:12,430 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 07:06:12,431 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [123674602] [2020-12-23 07:06:12,431 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1180554339] [2020-12-23 07:06:12,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 07:06:12,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:12,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-23 07:06:12,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:06:12,538 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 07:06:12,538 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:06:12,538 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-12-23 07:06:12,539 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [269535043] [2020-12-23 07:06:12,539 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-23 07:06:12,539 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:06:12,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-23 07:06:12,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-12-23 07:06:12,541 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 7 states. [2020-12-23 07:06:12,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:06:12,602 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-12-23 07:06:12,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-23 07:06:12,610 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-12-23 07:06:12,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:06:12,611 INFO L225 Difference]: With dead ends: 24 [2020-12-23 07:06:12,611 INFO L226 Difference]: Without dead ends: 17 [2020-12-23 07:06:12,612 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-12-23 07:06:12,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-12-23 07:06:12,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-12-23 07:06:12,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-12-23 07:06:12,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-12-23 07:06:12,618 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 14 [2020-12-23 07:06:12,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:06:12,618 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-12-23 07:06:12,618 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-23 07:06:12,619 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-12-23 07:06:12,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-12-23 07:06:12,619 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:06:12,619 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 07:06:12,823 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:06:12,824 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:06:12,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:06:12,825 INFO L82 PathProgramCache]: Analyzing trace with hash 1191961250, now seen corresponding path program 2 times [2020-12-23 07:06:12,825 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:06:12,826 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1302271251] [2020-12-23 07:06:12,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:06:12,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:12,936 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 07:06:12,937 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1302271251] [2020-12-23 07:06:12,937 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [782213262] [2020-12-23 07:06:12,937 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 07:06:12,993 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 07:06:12,993 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:06:12,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-23 07:06:12,996 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:06:13,086 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 07:06:13,086 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:06:13,086 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 9 [2020-12-23 07:06:13,088 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1239508350] [2020-12-23 07:06:13,088 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-23 07:06:13,092 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:06:13,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-23 07:06:13,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-12-23 07:06:13,094 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 9 states. [2020-12-23 07:06:13,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:06:13,179 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2020-12-23 07:06:13,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-23 07:06:13,180 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-12-23 07:06:13,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:06:13,181 INFO L225 Difference]: With dead ends: 26 [2020-12-23 07:06:13,181 INFO L226 Difference]: Without dead ends: 19 [2020-12-23 07:06:13,183 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-12-23 07:06:13,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-12-23 07:06:13,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-12-23 07:06:13,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-12-23 07:06:13,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2020-12-23 07:06:13,194 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 16 [2020-12-23 07:06:13,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:06:13,195 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2020-12-23 07:06:13,195 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-23 07:06:13,196 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2020-12-23 07:06:13,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-12-23 07:06:13,197 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:06:13,197 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 07:06:13,411 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-12-23 07:06:13,412 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:06:13,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:06:13,413 INFO L82 PathProgramCache]: Analyzing trace with hash 1290642949, now seen corresponding path program 3 times [2020-12-23 07:06:13,413 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:06:13,414 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [727766152] [2020-12-23 07:06:13,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:06:13,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:13,534 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 07:06:13,535 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [727766152] [2020-12-23 07:06:13,535 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1610669803] [2020-12-23 07:06:13,535 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 07:06:13,584 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-12-23 07:06:13,584 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:06:13,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-23 07:06:13,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:06:13,665 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 15 proven. 1 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-12-23 07:06:13,665 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:06:13,666 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 4] total 10 [2020-12-23 07:06:13,666 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1478899940] [2020-12-23 07:06:13,667 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-23 07:06:13,667 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:06:13,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-23 07:06:13,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-12-23 07:06:13,668 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 10 states. [2020-12-23 07:06:13,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:06:13,839 INFO L93 Difference]: Finished difference Result 33 states and 40 transitions. [2020-12-23 07:06:13,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-23 07:06:13,840 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 18 [2020-12-23 07:06:13,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:06:13,841 INFO L225 Difference]: With dead ends: 33 [2020-12-23 07:06:13,841 INFO L226 Difference]: Without dead ends: 26 [2020-12-23 07:06:13,842 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-12-23 07:06:13,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-12-23 07:06:13,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 23. [2020-12-23 07:06:13,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-12-23 07:06:13,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2020-12-23 07:06:13,847 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 18 [2020-12-23 07:06:13,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:06:13,848 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2020-12-23 07:06:13,848 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-23 07:06:13,848 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2020-12-23 07:06:13,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-12-23 07:06:13,849 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:06:13,849 INFO L422 BasicCegarLoop]: trace histogram [8, 6, 2, 1, 1, 1, 1, 1, 1] [2020-12-23 07:06:14,061 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:06:14,062 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:06:14,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:06:14,063 INFO L82 PathProgramCache]: Analyzing trace with hash -1175196403, now seen corresponding path program 4 times [2020-12-23 07:06:14,064 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:06:14,064 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [373880233] [2020-12-23 07:06:14,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:06:14,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:14,219 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 21 proven. 42 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-23 07:06:14,220 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [373880233] [2020-12-23 07:06:14,220 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1554264985] [2020-12-23 07:06:14,220 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 07:06:14,268 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 07:06:14,268 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:06:14,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-23 07:06:14,271 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:06:14,362 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 21 proven. 42 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-23 07:06:14,363 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:06:14,363 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-12-23 07:06:14,363 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [388995851] [2020-12-23 07:06:14,364 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-23 07:06:14,364 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:06:14,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-23 07:06:14,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-12-23 07:06:14,365 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 10 states. [2020-12-23 07:06:14,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:06:14,466 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-12-23 07:06:14,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-23 07:06:14,466 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 22 [2020-12-23 07:06:14,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:06:14,467 INFO L225 Difference]: With dead ends: 34 [2020-12-23 07:06:14,467 INFO L226 Difference]: Without dead ends: 25 [2020-12-23 07:06:14,468 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 20 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-12-23 07:06:14,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-12-23 07:06:14,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-12-23 07:06:14,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-12-23 07:06:14,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2020-12-23 07:06:14,472 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 22 [2020-12-23 07:06:14,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:06:14,473 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2020-12-23 07:06:14,473 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-23 07:06:14,473 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2020-12-23 07:06:14,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-12-23 07:06:14,474 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:06:14,474 INFO L422 BasicCegarLoop]: trace histogram [9, 7, 2, 1, 1, 1, 1, 1, 1] [2020-12-23 07:06:14,683 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:06:14,685 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:06:14,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:06:14,685 INFO L82 PathProgramCache]: Analyzing trace with hash -415213008, now seen corresponding path program 5 times [2020-12-23 07:06:14,686 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:06:14,686 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [52483515] [2020-12-23 07:06:14,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:06:14,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:14,856 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 24 proven. 56 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-23 07:06:14,857 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [52483515] [2020-12-23 07:06:14,857 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2030055212] [2020-12-23 07:06:14,857 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 07:06:15,047 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2020-12-23 07:06:15,047 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:06:15,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 20 conjunts are in the unsatisfiable core [2020-12-23 07:06:15,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:06:15,184 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 24 proven. 56 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-23 07:06:15,184 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:06:15,184 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2020-12-23 07:06:15,185 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1919252704] [2020-12-23 07:06:15,185 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-23 07:06:15,185 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:06:15,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-23 07:06:15,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-12-23 07:06:15,186 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 11 states. [2020-12-23 07:06:15,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:06:15,327 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2020-12-23 07:06:15,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-23 07:06:15,327 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 24 [2020-12-23 07:06:15,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:06:15,328 INFO L225 Difference]: With dead ends: 36 [2020-12-23 07:06:15,328 INFO L226 Difference]: Without dead ends: 27 [2020-12-23 07:06:15,329 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 21 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-12-23 07:06:15,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-12-23 07:06:15,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-12-23 07:06:15,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-12-23 07:06:15,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2020-12-23 07:06:15,333 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 24 [2020-12-23 07:06:15,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:06:15,334 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2020-12-23 07:06:15,334 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-23 07:06:15,334 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2020-12-23 07:06:15,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-12-23 07:06:15,335 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:06:15,335 INFO L422 BasicCegarLoop]: trace histogram [10, 8, 2, 1, 1, 1, 1, 1, 1] [2020-12-23 07:06:15,539 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2020-12-23 07:06:15,539 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:06:15,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:06:15,541 INFO L82 PathProgramCache]: Analyzing trace with hash -215610733, now seen corresponding path program 6 times [2020-12-23 07:06:15,541 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:06:15,542 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [158127194] [2020-12-23 07:06:15,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:06:15,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:15,751 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 27 proven. 72 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-23 07:06:15,751 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [158127194] [2020-12-23 07:06:15,752 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [716360815] [2020-12-23 07:06:15,752 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 07:06:15,908 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 11 check-sat command(s) [2020-12-23 07:06:15,909 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:06:15,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 28 conjunts are in the unsatisfiable core [2020-12-23 07:06:15,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:06:16,017 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-23 07:06:16,042 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 07:06:16,042 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:06:16,043 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 15 [2020-12-23 07:06:16,043 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2147339495] [2020-12-23 07:06:16,043 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-23 07:06:16,044 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:06:16,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-23 07:06:16,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2020-12-23 07:06:16,045 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 15 states. [2020-12-23 07:06:16,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:06:16,229 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2020-12-23 07:06:16,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-23 07:06:16,230 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 26 [2020-12-23 07:06:16,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:06:16,230 INFO L225 Difference]: With dead ends: 38 [2020-12-23 07:06:16,231 INFO L226 Difference]: Without dead ends: 29 [2020-12-23 07:06:16,231 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 22 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2020-12-23 07:06:16,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-12-23 07:06:16,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-12-23 07:06:16,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-12-23 07:06:16,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2020-12-23 07:06:16,236 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 26 [2020-12-23 07:06:16,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:06:16,236 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2020-12-23 07:06:16,236 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-23 07:06:16,236 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2020-12-23 07:06:16,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-12-23 07:06:16,237 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:06:16,237 INFO L422 BasicCegarLoop]: trace histogram [11, 9, 2, 1, 1, 1, 1, 1, 1] [2020-12-23 07:06:16,441 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:06:16,441 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:06:16,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:06:16,442 INFO L82 PathProgramCache]: Analyzing trace with hash -1671352778, now seen corresponding path program 7 times [2020-12-23 07:06:16,442 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:06:16,443 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [753504315] [2020-12-23 07:06:16,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:06:16,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:16,665 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 30 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-23 07:06:16,666 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [753504315] [2020-12-23 07:06:16,666 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [349853109] [2020-12-23 07:06:16,666 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 07:06:16,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:16,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 22 conjunts are in the unsatisfiable core [2020-12-23 07:06:16,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:06:16,807 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 30 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-23 07:06:16,807 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:06:16,807 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2020-12-23 07:06:16,808 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [854931505] [2020-12-23 07:06:16,808 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-12-23 07:06:16,808 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:06:16,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-12-23 07:06:16,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-12-23 07:06:16,809 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 13 states. [2020-12-23 07:06:17,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:06:17,002 INFO L93 Difference]: Finished difference Result 40 states and 45 transitions. [2020-12-23 07:06:17,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-23 07:06:17,005 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 28 [2020-12-23 07:06:17,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:06:17,006 INFO L225 Difference]: With dead ends: 40 [2020-12-23 07:06:17,006 INFO L226 Difference]: Without dead ends: 31 [2020-12-23 07:06:17,007 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 26 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-12-23 07:06:17,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-12-23 07:06:17,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-12-23 07:06:17,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-12-23 07:06:17,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2020-12-23 07:06:17,012 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 28 [2020-12-23 07:06:17,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:06:17,012 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2020-12-23 07:06:17,012 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-12-23 07:06:17,012 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2020-12-23 07:06:17,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-12-23 07:06:17,013 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:06:17,013 INFO L422 BasicCegarLoop]: trace histogram [12, 10, 2, 1, 1, 1, 1, 1, 1] [2020-12-23 07:06:17,227 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:06:17,228 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:06:17,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:06:17,229 INFO L82 PathProgramCache]: Analyzing trace with hash -480119527, now seen corresponding path program 8 times [2020-12-23 07:06:17,229 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:06:17,230 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [241543944] [2020-12-23 07:06:17,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:06:17,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:17,475 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 33 proven. 110 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-23 07:06:17,475 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [241543944] [2020-12-23 07:06:17,475 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1877033700] [2020-12-23 07:06:17,475 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 07:06:17,523 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 07:06:17,523 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:06:17,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 27 conjunts are in the unsatisfiable core [2020-12-23 07:06:17,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:06:17,662 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 07:06:17,662 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:06:17,663 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 16 [2020-12-23 07:06:17,663 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [350482098] [2020-12-23 07:06:17,663 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-12-23 07:06:17,663 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:06:17,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-12-23 07:06:17,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=200, Unknown=0, NotChecked=0, Total=240 [2020-12-23 07:06:17,665 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand 16 states. [2020-12-23 07:06:17,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:06:17,892 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2020-12-23 07:06:17,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-12-23 07:06:17,893 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 30 [2020-12-23 07:06:17,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:06:17,894 INFO L225 Difference]: With dead ends: 42 [2020-12-23 07:06:17,894 INFO L226 Difference]: Without dead ends: 33 [2020-12-23 07:06:17,895 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=40, Invalid=200, Unknown=0, NotChecked=0, Total=240 [2020-12-23 07:06:17,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-12-23 07:06:17,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-12-23 07:06:17,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-12-23 07:06:17,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2020-12-23 07:06:17,902 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 30 [2020-12-23 07:06:17,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:06:17,902 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2020-12-23 07:06:17,902 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-12-23 07:06:17,902 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2020-12-23 07:06:17,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-12-23 07:06:17,903 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:06:17,903 INFO L422 BasicCegarLoop]: trace histogram [13, 11, 2, 1, 1, 1, 1, 1, 1] [2020-12-23 07:06:18,118 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-12-23 07:06:18,119 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:06:18,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:06:18,120 INFO L82 PathProgramCache]: Analyzing trace with hash 1833733948, now seen corresponding path program 9 times [2020-12-23 07:06:18,120 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:06:18,121 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1678662565] [2020-12-23 07:06:18,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:06:18,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:18,349 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 36 proven. 132 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-23 07:06:18,349 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1678662565] [2020-12-23 07:06:18,350 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2009936321] [2020-12-23 07:06:18,350 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 07:06:18,407 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2020-12-23 07:06:18,407 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:06:18,408 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-23 07:06:18,410 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:06:18,520 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 55 proven. 4 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2020-12-23 07:06:18,520 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:06:18,520 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 5] total 17 [2020-12-23 07:06:18,521 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [623146723] [2020-12-23 07:06:18,521 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-12-23 07:06:18,521 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:06:18,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-12-23 07:06:18,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=206, Unknown=0, NotChecked=0, Total=272 [2020-12-23 07:06:18,522 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 17 states. [2020-12-23 07:06:18,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:06:18,959 INFO L93 Difference]: Finished difference Result 49 states and 58 transitions. [2020-12-23 07:06:18,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-23 07:06:18,959 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 32 [2020-12-23 07:06:18,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:06:18,962 INFO L225 Difference]: With dead ends: 49 [2020-12-23 07:06:18,962 INFO L226 Difference]: Without dead ends: 40 [2020-12-23 07:06:18,965 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=102, Invalid=278, Unknown=0, NotChecked=0, Total=380 [2020-12-23 07:06:18,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-12-23 07:06:18,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 37. [2020-12-23 07:06:18,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-12-23 07:06:18,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2020-12-23 07:06:18,972 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 32 [2020-12-23 07:06:18,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:06:18,972 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2020-12-23 07:06:18,972 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-12-23 07:06:18,972 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2020-12-23 07:06:18,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-12-23 07:06:18,973 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:06:18,973 INFO L422 BasicCegarLoop]: trace histogram [15, 12, 3, 1, 1, 1, 1, 1, 1] [2020-12-23 07:06:19,187 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-12-23 07:06:19,187 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:06:19,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:06:19,189 INFO L82 PathProgramCache]: Analyzing trace with hash 1350359876, now seen corresponding path program 10 times [2020-12-23 07:06:19,189 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:06:19,189 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1712829296] [2020-12-23 07:06:19,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:06:19,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:19,483 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 65 proven. 156 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-23 07:06:19,483 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1712829296] [2020-12-23 07:06:19,484 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [404525295] [2020-12-23 07:06:19,484 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 07:06:19,542 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 07:06:19,542 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:06:19,543 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 28 conjunts are in the unsatisfiable core [2020-12-23 07:06:19,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:06:19,657 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 65 proven. 156 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-23 07:06:19,657 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:06:19,657 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2020-12-23 07:06:19,659 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [258610537] [2020-12-23 07:06:19,659 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-12-23 07:06:19,659 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:06:19,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-12-23 07:06:19,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-12-23 07:06:19,660 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 16 states. [2020-12-23 07:06:19,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:06:19,973 INFO L93 Difference]: Finished difference Result 50 states and 57 transitions. [2020-12-23 07:06:19,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-23 07:06:19,974 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 36 [2020-12-23 07:06:19,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:06:19,977 INFO L225 Difference]: With dead ends: 50 [2020-12-23 07:06:19,978 INFO L226 Difference]: Without dead ends: 39 [2020-12-23 07:06:19,981 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 34 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-12-23 07:06:19,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-12-23 07:06:19,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-12-23 07:06:19,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-12-23 07:06:19,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2020-12-23 07:06:19,990 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 36 [2020-12-23 07:06:19,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:06:19,990 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2020-12-23 07:06:19,991 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-12-23 07:06:19,991 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2020-12-23 07:06:19,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-12-23 07:06:19,991 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:06:19,992 INFO L422 BasicCegarLoop]: trace histogram [16, 13, 3, 1, 1, 1, 1, 1, 1] [2020-12-23 07:06:20,192 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2020-12-23 07:06:20,193 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:06:20,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:06:20,194 INFO L82 PathProgramCache]: Analyzing trace with hash -33157337, now seen corresponding path program 11 times [2020-12-23 07:06:20,194 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:06:20,195 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1945442146] [2020-12-23 07:06:20,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:06:20,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:20,543 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 70 proven. 182 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-23 07:06:20,543 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1945442146] [2020-12-23 07:06:20,543 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [82084168] [2020-12-23 07:06:20,544 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 07:06:20,840 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2020-12-23 07:06:20,841 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:06:20,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 41 conjunts are in the unsatisfiable core [2020-12-23 07:06:20,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:06:21,160 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 70 proven. 182 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-23 07:06:21,161 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:06:21,161 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2020-12-23 07:06:21,161 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [102480626] [2020-12-23 07:06:21,162 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-12-23 07:06:21,162 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:06:21,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-12-23 07:06:21,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-12-23 07:06:21,163 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand 17 states. [2020-12-23 07:06:21,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:06:21,465 INFO L93 Difference]: Finished difference Result 52 states and 59 transitions. [2020-12-23 07:06:21,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-12-23 07:06:21,465 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 38 [2020-12-23 07:06:21,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:06:21,466 INFO L225 Difference]: With dead ends: 52 [2020-12-23 07:06:21,466 INFO L226 Difference]: Without dead ends: 41 [2020-12-23 07:06:21,467 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 26 SyntacticMatches, 13 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-12-23 07:06:21,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-12-23 07:06:21,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-12-23 07:06:21,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-12-23 07:06:21,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2020-12-23 07:06:21,472 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 38 [2020-12-23 07:06:21,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:06:21,472 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2020-12-23 07:06:21,472 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-12-23 07:06:21,472 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2020-12-23 07:06:21,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-12-23 07:06:21,473 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:06:21,473 INFO L422 BasicCegarLoop]: trace histogram [17, 14, 3, 1, 1, 1, 1, 1, 1] [2020-12-23 07:06:21,681 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:06:21,681 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:06:21,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:06:21,682 INFO L82 PathProgramCache]: Analyzing trace with hash 1846662730, now seen corresponding path program 12 times [2020-12-23 07:06:21,683 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:06:21,683 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1132423877] [2020-12-23 07:06:21,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:06:21,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:22,018 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 75 proven. 210 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-23 07:06:22,019 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1132423877] [2020-12-23 07:06:22,019 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2134289875] [2020-12-23 07:06:22,019 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 07:06:22,238 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 15 check-sat command(s) [2020-12-23 07:06:22,238 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:06:22,239 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 32 conjunts are in the unsatisfiable core [2020-12-23 07:06:22,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:06:23,015 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 143 proven. 72 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2020-12-23 07:06:23,015 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:06:23,015 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 10] total 25 [2020-12-23 07:06:23,016 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [623123628] [2020-12-23 07:06:23,016 INFO L461 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-12-23 07:06:23,016 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:06:23,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-12-23 07:06:23,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=474, Unknown=0, NotChecked=0, Total=600 [2020-12-23 07:06:23,018 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand 25 states. [2020-12-23 07:06:23,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:06:23,639 INFO L93 Difference]: Finished difference Result 65 states and 79 transitions. [2020-12-23 07:06:23,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-12-23 07:06:23,639 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 40 [2020-12-23 07:06:23,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:06:23,640 INFO L225 Difference]: With dead ends: 65 [2020-12-23 07:06:23,640 INFO L226 Difference]: Without dead ends: 54 [2020-12-23 07:06:23,641 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 31 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=143, Invalid=507, Unknown=0, NotChecked=0, Total=650 [2020-12-23 07:06:23,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-12-23 07:06:23,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 46. [2020-12-23 07:06:23,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-12-23 07:06:23,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2020-12-23 07:06:23,647 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 40 [2020-12-23 07:06:23,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:06:23,647 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2020-12-23 07:06:23,648 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-12-23 07:06:23,648 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2020-12-23 07:06:23,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-12-23 07:06:23,648 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:06:23,649 INFO L422 BasicCegarLoop]: trace histogram [19, 15, 4, 1, 1, 1, 1, 1, 1] [2020-12-23 07:06:23,854 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-12-23 07:06:23,855 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:06:23,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:06:23,856 INFO L82 PathProgramCache]: Analyzing trace with hash -1664138286, now seen corresponding path program 13 times [2020-12-23 07:06:23,856 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:06:23,857 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1023285109] [2020-12-23 07:06:23,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:06:23,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:24,208 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 112 proven. 240 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-12-23 07:06:24,209 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1023285109] [2020-12-23 07:06:24,209 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [857071230] [2020-12-23 07:06:24,209 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:06:24,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:24,259 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 34 conjunts are in the unsatisfiable core [2020-12-23 07:06:24,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:06:24,406 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 112 proven. 240 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-12-23 07:06:24,407 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:06:24,407 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2020-12-23 07:06:24,407 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193801632] [2020-12-23 07:06:24,408 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-12-23 07:06:24,408 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:06:24,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-12-23 07:06:24,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-12-23 07:06:24,409 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 19 states. [2020-12-23 07:06:24,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:06:24,783 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2020-12-23 07:06:24,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-23 07:06:24,784 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 44 [2020-12-23 07:06:24,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:06:24,784 INFO L225 Difference]: With dead ends: 62 [2020-12-23 07:06:24,784 INFO L226 Difference]: Without dead ends: 48 [2020-12-23 07:06:24,785 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-12-23 07:06:24,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-12-23 07:06:24,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-12-23 07:06:24,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-12-23 07:06:24,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2020-12-23 07:06:24,791 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 44 [2020-12-23 07:06:24,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:06:24,791 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2020-12-23 07:06:24,791 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-12-23 07:06:24,791 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2020-12-23 07:06:24,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-12-23 07:06:24,792 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:06:24,792 INFO L422 BasicCegarLoop]: trace histogram [20, 16, 4, 1, 1, 1, 1, 1, 1] [2020-12-23 07:06:25,004 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2020-12-23 07:06:25,005 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:06:25,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:06:25,006 INFO L82 PathProgramCache]: Analyzing trace with hash -870062923, now seen corresponding path program 14 times [2020-12-23 07:06:25,006 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:06:25,007 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [411423129] [2020-12-23 07:06:25,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:06:25,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:25,415 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 119 proven. 272 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-12-23 07:06:25,416 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [411423129] [2020-12-23 07:06:25,417 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [813370019] [2020-12-23 07:06:25,417 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:06:25,475 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 07:06:25,475 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:06:25,476 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 43 conjunts are in the unsatisfiable core [2020-12-23 07:06:25,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:06:25,706 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 07:06:25,707 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:06:25,707 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 23] total 24 [2020-12-23 07:06:25,707 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2052610043] [2020-12-23 07:06:25,708 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-12-23 07:06:25,708 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:06:25,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-12-23 07:06:25,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=490, Unknown=0, NotChecked=0, Total=552 [2020-12-23 07:06:25,709 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 24 states. [2020-12-23 07:06:26,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:06:26,224 INFO L93 Difference]: Finished difference Result 64 states and 69 transitions. [2020-12-23 07:06:26,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-12-23 07:06:26,224 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 46 [2020-12-23 07:06:26,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:06:26,225 INFO L225 Difference]: With dead ends: 64 [2020-12-23 07:06:26,226 INFO L226 Difference]: Without dead ends: 50 [2020-12-23 07:06:26,226 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=62, Invalid=490, Unknown=0, NotChecked=0, Total=552 [2020-12-23 07:06:26,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-12-23 07:06:26,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-12-23 07:06:26,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-12-23 07:06:26,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2020-12-23 07:06:26,232 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 46 [2020-12-23 07:06:26,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:06:26,233 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2020-12-23 07:06:26,233 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-12-23 07:06:26,233 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2020-12-23 07:06:26,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-12-23 07:06:26,234 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:06:26,234 INFO L422 BasicCegarLoop]: trace histogram [21, 17, 4, 1, 1, 1, 1, 1, 1] [2020-12-23 07:06:26,448 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:06:26,449 INFO L429 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:06:26,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:06:26,450 INFO L82 PathProgramCache]: Analyzing trace with hash 2027149528, now seen corresponding path program 15 times [2020-12-23 07:06:26,450 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:06:26,450 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1263778673] [2020-12-23 07:06:26,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:06:26,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:26,884 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 126 proven. 306 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-12-23 07:06:26,885 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1263778673] [2020-12-23 07:06:26,885 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1786449444] [2020-12-23 07:06:26,885 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:06:26,983 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2020-12-23 07:06:26,983 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:06:26,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-23 07:06:26,985 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:06:27,246 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 153 proven. 16 refuted. 0 times theorem prover too weak. 272 trivial. 0 not checked. [2020-12-23 07:06:27,246 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:06:27,246 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 7] total 25 [2020-12-23 07:06:27,246 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [450197192] [2020-12-23 07:06:27,247 INFO L461 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-12-23 07:06:27,247 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:06:27,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-12-23 07:06:27,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=476, Unknown=0, NotChecked=0, Total=600 [2020-12-23 07:06:27,248 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 25 states. [2020-12-23 07:06:28,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:06:28,354 INFO L93 Difference]: Finished difference Result 70 states and 78 transitions. [2020-12-23 07:06:28,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-12-23 07:06:28,355 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 48 [2020-12-23 07:06:28,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:06:28,356 INFO L225 Difference]: With dead ends: 70 [2020-12-23 07:06:28,356 INFO L226 Difference]: Without dead ends: 56 [2020-12-23 07:06:28,357 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=204, Invalid=666, Unknown=0, NotChecked=0, Total=870 [2020-12-23 07:06:28,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-12-23 07:06:28,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 53. [2020-12-23 07:06:28,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-12-23 07:06:28,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2020-12-23 07:06:28,362 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 48 [2020-12-23 07:06:28,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:06:28,362 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2020-12-23 07:06:28,363 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-12-23 07:06:28,363 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2020-12-23 07:06:28,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-12-23 07:06:28,363 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:06:28,363 INFO L422 BasicCegarLoop]: trace histogram [23, 18, 5, 1, 1, 1, 1, 1, 1] [2020-12-23 07:06:28,566 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:06:28,567 INFO L429 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:06:28,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:06:28,568 INFO L82 PathProgramCache]: Analyzing trace with hash -1008695328, now seen corresponding path program 16 times [2020-12-23 07:06:28,568 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:06:28,568 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1100977132] [2020-12-23 07:06:28,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:06:28,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:29,002 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 171 proven. 342 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-23 07:06:29,003 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1100977132] [2020-12-23 07:06:29,003 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1860960140] [2020-12-23 07:06:29,003 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:06:29,050 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 07:06:29,050 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:06:29,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 40 conjunts are in the unsatisfiable core [2020-12-23 07:06:29,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:06:29,200 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 171 proven. 342 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-23 07:06:29,200 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:06:29,201 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2020-12-23 07:06:29,201 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [395173858] [2020-12-23 07:06:29,201 INFO L461 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-12-23 07:06:29,201 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:06:29,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-12-23 07:06:29,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-12-23 07:06:29,202 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand 22 states. [2020-12-23 07:06:29,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:06:29,712 INFO L93 Difference]: Finished difference Result 70 states and 75 transitions. [2020-12-23 07:06:29,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-12-23 07:06:29,713 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 52 [2020-12-23 07:06:29,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:06:29,713 INFO L225 Difference]: With dead ends: 70 [2020-12-23 07:06:29,714 INFO L226 Difference]: Without dead ends: 55 [2020-12-23 07:06:29,714 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-12-23 07:06:29,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-12-23 07:06:29,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-12-23 07:06:29,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-12-23 07:06:29,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2020-12-23 07:06:29,720 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 52 [2020-12-23 07:06:29,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:06:29,720 INFO L481 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2020-12-23 07:06:29,720 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-12-23 07:06:29,720 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2020-12-23 07:06:29,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-12-23 07:06:29,721 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:06:29,721 INFO L422 BasicCegarLoop]: trace histogram [24, 19, 5, 1, 1, 1, 1, 1, 1] [2020-12-23 07:06:29,935 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:06:29,935 INFO L429 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:06:29,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:06:29,936 INFO L82 PathProgramCache]: Analyzing trace with hash -1656515133, now seen corresponding path program 17 times [2020-12-23 07:06:29,936 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:06:29,936 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1119600835] [2020-12-23 07:06:29,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:06:29,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:30,392 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 180 proven. 380 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-23 07:06:30,393 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1119600835] [2020-12-23 07:06:30,393 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1593080405] [2020-12-23 07:06:30,393 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:06:31,446 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2020-12-23 07:06:31,446 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:06:31,449 WARN L261 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 69 conjunts are in the unsatisfiable core [2020-12-23 07:06:31,451 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:06:32,029 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 180 proven. 380 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-23 07:06:32,029 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:06:32,030 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 23 [2020-12-23 07:06:32,030 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648186800] [2020-12-23 07:06:32,030 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-12-23 07:06:32,030 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:06:32,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-12-23 07:06:32,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-12-23 07:06:32,031 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand 23 states. [2020-12-23 07:06:32,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:06:32,670 INFO L93 Difference]: Finished difference Result 72 states and 77 transitions. [2020-12-23 07:06:32,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-12-23 07:06:32,675 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 54 [2020-12-23 07:06:32,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:06:32,675 INFO L225 Difference]: With dead ends: 72 [2020-12-23 07:06:32,675 INFO L226 Difference]: Without dead ends: 57 [2020-12-23 07:06:32,676 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 34 SyntacticMatches, 21 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-12-23 07:06:32,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-12-23 07:06:32,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-12-23 07:06:32,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-12-23 07:06:32,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2020-12-23 07:06:32,700 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 54 [2020-12-23 07:06:32,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:06:32,700 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2020-12-23 07:06:32,701 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-12-23 07:06:32,701 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2020-12-23 07:06:32,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-12-23 07:06:32,703 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:06:32,703 INFO L422 BasicCegarLoop]: trace histogram [25, 20, 5, 1, 1, 1, 1, 1, 1] [2020-12-23 07:06:32,907 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2020-12-23 07:06:32,907 INFO L429 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:06:32,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:06:32,908 INFO L82 PathProgramCache]: Analyzing trace with hash -1441089818, now seen corresponding path program 18 times [2020-12-23 07:06:32,908 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:06:32,909 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1824180403] [2020-12-23 07:06:32,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:06:32,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:33,417 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 189 proven. 420 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-23 07:06:33,417 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1824180403] [2020-12-23 07:06:33,417 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1942778597] [2020-12-23 07:06:33,417 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:06:33,859 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 23 check-sat command(s) [2020-12-23 07:06:33,860 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:06:33,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 18 conjunts are in the unsatisfiable core [2020-12-23 07:06:33,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:06:34,311 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 220 proven. 25 refuted. 0 times theorem prover too weak. 380 trivial. 0 not checked. [2020-12-23 07:06:34,312 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:06:34,312 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 8] total 29 [2020-12-23 07:06:34,312 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1798788671] [2020-12-23 07:06:34,312 INFO L461 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-12-23 07:06:34,312 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:06:34,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-12-23 07:06:34,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=662, Unknown=0, NotChecked=0, Total=812 [2020-12-23 07:06:34,313 INFO L87 Difference]: Start difference. First operand 57 states and 59 transitions. Second operand 29 states. [2020-12-23 07:06:36,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:06:36,063 INFO L93 Difference]: Finished difference Result 79 states and 88 transitions. [2020-12-23 07:06:36,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-12-23 07:06:36,064 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 56 [2020-12-23 07:06:36,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:06:36,064 INFO L225 Difference]: With dead ends: 79 [2020-12-23 07:06:36,065 INFO L226 Difference]: Without dead ends: 64 [2020-12-23 07:06:36,065 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=216, Invalid=974, Unknown=0, NotChecked=0, Total=1190 [2020-12-23 07:06:36,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-12-23 07:06:36,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 62. [2020-12-23 07:06:36,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-12-23 07:06:36,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2020-12-23 07:06:36,071 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 56 [2020-12-23 07:06:36,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:06:36,071 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2020-12-23 07:06:36,071 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-12-23 07:06:36,071 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2020-12-23 07:06:36,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-12-23 07:06:36,072 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:06:36,072 INFO L422 BasicCegarLoop]: trace histogram [27, 21, 6, 1, 1, 1, 1, 1, 1] [2020-12-23 07:06:36,275 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2020-12-23 07:06:36,276 INFO L429 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:06:36,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:06:36,277 INFO L82 PathProgramCache]: Analyzing trace with hash 766560110, now seen corresponding path program 19 times [2020-12-23 07:06:36,277 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:06:36,277 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1161955838] [2020-12-23 07:06:36,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:06:36,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:36,814 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 242 proven. 462 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2020-12-23 07:06:36,815 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1161955838] [2020-12-23 07:06:36,815 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [319977622] [2020-12-23 07:06:36,815 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:06:36,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:36,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 46 conjunts are in the unsatisfiable core [2020-12-23 07:06:36,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:06:37,050 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 242 proven. 462 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2020-12-23 07:06:37,051 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:06:37,051 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 25 [2020-12-23 07:06:37,051 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2139139990] [2020-12-23 07:06:37,051 INFO L461 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-12-23 07:06:37,051 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:06:37,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-12-23 07:06:37,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-12-23 07:06:37,052 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 25 states. [2020-12-23 07:06:37,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:06:37,792 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2020-12-23 07:06:37,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-12-23 07:06:37,793 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 60 [2020-12-23 07:06:37,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:06:37,794 INFO L225 Difference]: With dead ends: 82 [2020-12-23 07:06:37,794 INFO L226 Difference]: Without dead ends: 64 [2020-12-23 07:06:37,795 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 58 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-12-23 07:06:37,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-12-23 07:06:37,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-12-23 07:06:37,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-12-23 07:06:37,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-12-23 07:06:37,806 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 60 [2020-12-23 07:06:37,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:06:37,807 INFO L481 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-12-23 07:06:37,807 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-12-23 07:06:37,807 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-12-23 07:06:37,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-12-23 07:06:37,807 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:06:37,808 INFO L422 BasicCegarLoop]: trace histogram [28, 22, 6, 1, 1, 1, 1, 1, 1] [2020-12-23 07:06:38,011 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:06:38,012 INFO L429 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:06:38,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:06:38,013 INFO L82 PathProgramCache]: Analyzing trace with hash -429571503, now seen corresponding path program 20 times [2020-12-23 07:06:38,013 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:06:38,013 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [173233624] [2020-12-23 07:06:38,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:06:38,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:38,647 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 253 proven. 506 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2020-12-23 07:06:38,647 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [173233624] [2020-12-23 07:06:38,648 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1653851297] [2020-12-23 07:06:38,648 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:06:38,709 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 07:06:38,709 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:06:38,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 59 conjunts are in the unsatisfiable core [2020-12-23 07:06:38,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:06:39,117 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 07:06:39,117 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:06:39,117 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 31] total 32 [2020-12-23 07:06:39,117 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [873738807] [2020-12-23 07:06:39,118 INFO L461 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-12-23 07:06:39,118 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:06:39,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-12-23 07:06:39,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=908, Unknown=0, NotChecked=0, Total=992 [2020-12-23 07:06:39,119 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 32 states. [2020-12-23 07:06:40,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:06:40,129 INFO L93 Difference]: Finished difference Result 84 states and 89 transitions. [2020-12-23 07:06:40,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-12-23 07:06:40,130 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 62 [2020-12-23 07:06:40,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:06:40,131 INFO L225 Difference]: With dead ends: 84 [2020-12-23 07:06:40,131 INFO L226 Difference]: Without dead ends: 66 [2020-12-23 07:06:40,132 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 55 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=84, Invalid=908, Unknown=0, NotChecked=0, Total=992 [2020-12-23 07:06:40,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-12-23 07:06:40,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2020-12-23 07:06:40,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-12-23 07:06:40,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2020-12-23 07:06:40,138 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 62 [2020-12-23 07:06:40,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:06:40,138 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2020-12-23 07:06:40,139 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-12-23 07:06:40,139 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2020-12-23 07:06:40,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-12-23 07:06:40,139 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:06:40,139 INFO L422 BasicCegarLoop]: trace histogram [29, 23, 6, 1, 1, 1, 1, 1, 1] [2020-12-23 07:06:40,351 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2020-12-23 07:06:40,352 INFO L429 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:06:40,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:06:40,353 INFO L82 PathProgramCache]: Analyzing trace with hash 1139183732, now seen corresponding path program 21 times [2020-12-23 07:06:40,353 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:06:40,354 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1946411762] [2020-12-23 07:06:40,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:06:40,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:40,999 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 264 proven. 552 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2020-12-23 07:06:40,999 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1946411762] [2020-12-23 07:06:40,999 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1934198161] [2020-12-23 07:06:41,000 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:06:41,176 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2020-12-23 07:06:41,177 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:06:41,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 28 conjunts are in the unsatisfiable core [2020-12-23 07:06:41,179 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:06:42,657 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 299 proven. 36 refuted. 0 times theorem prover too weak. 506 trivial. 0 not checked. [2020-12-23 07:06:42,659 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:06:42,659 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 9] total 33 [2020-12-23 07:06:42,660 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077895077] [2020-12-23 07:06:42,660 INFO L461 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-12-23 07:06:42,660 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:06:42,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-12-23 07:06:42,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=948, Unknown=0, NotChecked=0, Total=1056 [2020-12-23 07:06:42,661 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 33 states. [2020-12-23 07:06:44,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:06:44,363 INFO L93 Difference]: Finished difference Result 88 states and 95 transitions. [2020-12-23 07:06:44,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-12-23 07:06:44,363 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 64 [2020-12-23 07:06:44,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:06:44,364 INFO L225 Difference]: With dead ends: 88 [2020-12-23 07:06:44,365 INFO L226 Difference]: Without dead ends: 70 [2020-12-23 07:06:44,365 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 52 SyntacticMatches, 7 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=134, Invalid=988, Unknown=0, NotChecked=0, Total=1122 [2020-12-23 07:06:44,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-12-23 07:06:44,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-12-23 07:06:44,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-12-23 07:06:44,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2020-12-23 07:06:44,372 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 64 [2020-12-23 07:06:44,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:06:44,372 INFO L481 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2020-12-23 07:06:44,372 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-12-23 07:06:44,372 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2020-12-23 07:06:44,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-12-23 07:06:44,373 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:06:44,373 INFO L422 BasicCegarLoop]: trace histogram [31, 24, 7, 1, 1, 1, 1, 1, 1] [2020-12-23 07:06:44,576 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:06:44,577 INFO L429 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:06:44,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:06:44,578 INFO L82 PathProgramCache]: Analyzing trace with hash -373808516, now seen corresponding path program 22 times [2020-12-23 07:06:44,578 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:06:44,578 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1142670675] [2020-12-23 07:06:44,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:06:44,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:45,287 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 325 proven. 600 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-23 07:06:45,287 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1142670675] [2020-12-23 07:06:45,287 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [579247954] [2020-12-23 07:06:45,287 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:06:45,345 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 07:06:45,345 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:06:45,346 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 52 conjunts are in the unsatisfiable core [2020-12-23 07:06:45,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:06:45,547 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 325 proven. 600 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-23 07:06:45,547 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:06:45,547 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 28 [2020-12-23 07:06:45,547 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1586281404] [2020-12-23 07:06:45,547 INFO L461 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-12-23 07:06:45,548 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:06:45,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-12-23 07:06:45,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-12-23 07:06:45,549 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand 28 states. [2020-12-23 07:06:46,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:06:46,577 INFO L93 Difference]: Finished difference Result 92 states and 97 transitions. [2020-12-23 07:06:46,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-12-23 07:06:46,578 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 68 [2020-12-23 07:06:46,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:06:46,579 INFO L225 Difference]: With dead ends: 92 [2020-12-23 07:06:46,579 INFO L226 Difference]: Without dead ends: 72 [2020-12-23 07:06:46,580 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 66 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-12-23 07:06:46,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-12-23 07:06:46,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2020-12-23 07:06:46,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-12-23 07:06:46,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2020-12-23 07:06:46,587 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 68 [2020-12-23 07:06:46,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:06:46,587 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2020-12-23 07:06:46,587 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-12-23 07:06:46,587 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2020-12-23 07:06:46,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-12-23 07:06:46,588 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:06:46,588 INFO L422 BasicCegarLoop]: trace histogram [32, 25, 7, 1, 1, 1, 1, 1, 1] [2020-12-23 07:06:46,801 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2020-12-23 07:06:46,802 INFO L429 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:06:46,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:06:46,803 INFO L82 PathProgramCache]: Analyzing trace with hash -1006564769, now seen corresponding path program 23 times [2020-12-23 07:06:46,803 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:06:46,803 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [450704357] [2020-12-23 07:06:46,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:06:46,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:47,574 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 338 proven. 650 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-23 07:06:47,575 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [450704357] [2020-12-23 07:06:47,575 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [580590915] [2020-12-23 07:06:47,575 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:06:57,109 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 33 check-sat command(s) [2020-12-23 07:06:57,109 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:06:57,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 58 conjunts are in the unsatisfiable core [2020-12-23 07:06:57,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:06:57,397 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 252 proven. 756 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-23 07:06:57,397 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:06:57,397 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 30] total 31 [2020-12-23 07:06:57,398 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1143116551] [2020-12-23 07:06:57,398 INFO L461 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-12-23 07:06:57,398 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:06:57,398 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-12-23 07:06:57,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=845, Unknown=0, NotChecked=0, Total=930 [2020-12-23 07:06:57,399 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 31 states. [2020-12-23 07:06:58,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:06:58,607 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2020-12-23 07:06:58,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-12-23 07:06:58,608 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 70 [2020-12-23 07:06:58,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:06:58,609 INFO L225 Difference]: With dead ends: 94 [2020-12-23 07:06:58,609 INFO L226 Difference]: Without dead ends: 74 [2020-12-23 07:06:58,610 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 66 SyntacticMatches, 3 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=85, Invalid=845, Unknown=0, NotChecked=0, Total=930 [2020-12-23 07:06:58,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-12-23 07:06:58,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2020-12-23 07:06:58,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-12-23 07:06:58,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2020-12-23 07:06:58,615 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 70 [2020-12-23 07:06:58,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:06:58,615 INFO L481 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2020-12-23 07:06:58,615 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-12-23 07:06:58,615 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2020-12-23 07:06:58,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-12-23 07:06:58,615 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:06:58,616 INFO L422 BasicCegarLoop]: trace histogram [33, 26, 7, 1, 1, 1, 1, 1, 1] [2020-12-23 07:06:58,816 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2020-12-23 07:06:58,816 INFO L429 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:06:58,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:06:58,817 INFO L82 PathProgramCache]: Analyzing trace with hash 800032130, now seen corresponding path program 24 times [2020-12-23 07:06:58,817 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:06:58,818 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [922596283] [2020-12-23 07:06:58,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:06:58,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:06:59,681 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 351 proven. 702 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-23 07:06:59,681 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [922596283] [2020-12-23 07:06:59,681 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1746089887] [2020-12-23 07:06:59,682 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:07:00,527 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2020-12-23 07:07:00,528 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:07:00,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 29 conjunts are in the unsatisfiable core [2020-12-23 07:07:00,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:07:01,660 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 390 proven. 49 refuted. 0 times theorem prover too weak. 650 trivial. 0 not checked. [2020-12-23 07:07:01,661 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:07:01,661 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 10] total 37 [2020-12-23 07:07:01,661 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1859806175] [2020-12-23 07:07:01,661 INFO L461 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-12-23 07:07:01,661 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:07:01,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-12-23 07:07:01,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=1130, Unknown=0, NotChecked=0, Total=1332 [2020-12-23 07:07:01,663 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand 37 states. [2020-12-23 07:07:06,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:07:06,481 INFO L93 Difference]: Finished difference Result 100 states and 108 transitions. [2020-12-23 07:07:06,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-12-23 07:07:06,482 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 72 [2020-12-23 07:07:06,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:07:06,483 INFO L225 Difference]: With dead ends: 100 [2020-12-23 07:07:06,483 INFO L226 Difference]: Without dead ends: 80 [2020-12-23 07:07:06,484 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 69 SyntacticMatches, 3 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=294, Invalid=1686, Unknown=0, NotChecked=0, Total=1980 [2020-12-23 07:07:06,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-12-23 07:07:06,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 78. [2020-12-23 07:07:06,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-12-23 07:07:06,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2020-12-23 07:07:06,491 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 72 [2020-12-23 07:07:06,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:07:06,491 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2020-12-23 07:07:06,491 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-12-23 07:07:06,491 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2020-12-23 07:07:06,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-12-23 07:07:06,492 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:07:06,492 INFO L422 BasicCegarLoop]: trace histogram [35, 27, 8, 1, 1, 1, 1, 1, 1] [2020-12-23 07:07:06,696 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2020-12-23 07:07:06,697 INFO L429 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:07:06,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:07:06,698 INFO L82 PathProgramCache]: Analyzing trace with hash -1327056630, now seen corresponding path program 25 times [2020-12-23 07:07:06,698 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:07:06,698 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [363342694] [2020-12-23 07:07:06,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:07:06,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:07:07,650 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 420 proven. 756 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2020-12-23 07:07:07,650 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [363342694] [2020-12-23 07:07:07,650 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2011076864] [2020-12-23 07:07:07,650 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:07:07,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:07:07,712 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 58 conjunts are in the unsatisfiable core [2020-12-23 07:07:07,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:07:07,936 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 420 proven. 756 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2020-12-23 07:07:07,936 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:07:07,936 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 31 [2020-12-23 07:07:07,936 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [373656662] [2020-12-23 07:07:07,937 INFO L461 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-12-23 07:07:07,937 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:07:07,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-12-23 07:07:07,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-12-23 07:07:07,938 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand 31 states. [2020-12-23 07:07:09,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:07:09,277 INFO L93 Difference]: Finished difference Result 102 states and 107 transitions. [2020-12-23 07:07:09,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-12-23 07:07:09,278 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-12-23 07:07:09,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:07:09,279 INFO L225 Difference]: With dead ends: 102 [2020-12-23 07:07:09,279 INFO L226 Difference]: Without dead ends: 80 [2020-12-23 07:07:09,280 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 74 SyntacticMatches, 3 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-12-23 07:07:09,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-12-23 07:07:09,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2020-12-23 07:07:09,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-12-23 07:07:09,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2020-12-23 07:07:09,286 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 76 [2020-12-23 07:07:09,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:07:09,287 INFO L481 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2020-12-23 07:07:09,287 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-12-23 07:07:09,287 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2020-12-23 07:07:09,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-12-23 07:07:09,287 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:07:09,288 INFO L422 BasicCegarLoop]: trace histogram [36, 28, 8, 1, 1, 1, 1, 1, 1] [2020-12-23 07:07:09,492 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:07:09,492 INFO L429 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:07:09,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:07:09,493 INFO L82 PathProgramCache]: Analyzing trace with hash -66646547, now seen corresponding path program 26 times [2020-12-23 07:07:09,494 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:07:09,494 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2094677189] [2020-12-23 07:07:09,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:07:09,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:07:10,496 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 435 proven. 812 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2020-12-23 07:07:10,497 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2094677189] [2020-12-23 07:07:10,497 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1071146446] [2020-12-23 07:07:10,497 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:07:10,571 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 07:07:10,571 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:07:10,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 75 conjunts are in the unsatisfiable core [2020-12-23 07:07:10,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:07:11,245 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 07:07:11,246 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:07:11,246 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 39] total 40 [2020-12-23 07:07:11,246 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1986417684] [2020-12-23 07:07:11,246 INFO L461 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-12-23 07:07:11,246 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:07:11,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-12-23 07:07:11,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=1454, Unknown=0, NotChecked=0, Total=1560 [2020-12-23 07:07:11,247 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 40 states. [2020-12-23 07:07:13,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:07:13,132 INFO L93 Difference]: Finished difference Result 104 states and 109 transitions. [2020-12-23 07:07:13,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-12-23 07:07:13,133 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 78 [2020-12-23 07:07:13,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:07:13,135 INFO L225 Difference]: With dead ends: 104 [2020-12-23 07:07:13,135 INFO L226 Difference]: Without dead ends: 82 [2020-12-23 07:07:13,136 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 69 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=106, Invalid=1454, Unknown=0, NotChecked=0, Total=1560 [2020-12-23 07:07:13,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-12-23 07:07:13,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2020-12-23 07:07:13,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-12-23 07:07:13,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2020-12-23 07:07:13,142 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 78 [2020-12-23 07:07:13,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:07:13,142 INFO L481 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2020-12-23 07:07:13,142 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-12-23 07:07:13,142 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2020-12-23 07:07:13,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-12-23 07:07:13,143 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:07:13,143 INFO L422 BasicCegarLoop]: trace histogram [37, 29, 8, 1, 1, 1, 1, 1, 1] [2020-12-23 07:07:13,345 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2020-12-23 07:07:13,346 INFO L429 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:07:13,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:07:13,346 INFO L82 PathProgramCache]: Analyzing trace with hash 6665744, now seen corresponding path program 27 times [2020-12-23 07:07:13,347 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:07:13,347 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1601021693] [2020-12-23 07:07:13,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:07:13,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:07:14,477 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 450 proven. 870 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2020-12-23 07:07:14,477 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1601021693] [2020-12-23 07:07:14,477 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [668042449] [2020-12-23 07:07:14,478 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:07:14,957 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2020-12-23 07:07:14,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:07:14,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 28 conjunts are in the unsatisfiable core [2020-12-23 07:07:14,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:07:16,962 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 493 proven. 64 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2020-12-23 07:07:16,963 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:07:16,963 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 11] total 41 [2020-12-23 07:07:16,963 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722843942] [2020-12-23 07:07:16,963 INFO L461 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-12-23 07:07:16,963 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:07:16,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-12-23 07:07:16,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=1454, Unknown=0, NotChecked=0, Total=1640 [2020-12-23 07:07:16,965 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 41 states. [2020-12-23 07:07:22,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:07:22,857 INFO L93 Difference]: Finished difference Result 110 states and 118 transitions. [2020-12-23 07:07:22,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-12-23 07:07:22,858 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 80 [2020-12-23 07:07:22,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:07:22,859 INFO L225 Difference]: With dead ends: 110 [2020-12-23 07:07:22,859 INFO L226 Difference]: Without dead ends: 88 [2020-12-23 07:07:22,860 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 75 SyntacticMatches, 5 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=281, Invalid=2169, Unknown=0, NotChecked=0, Total=2450 [2020-12-23 07:07:22,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-12-23 07:07:22,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 86. [2020-12-23 07:07:22,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-12-23 07:07:22,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2020-12-23 07:07:22,867 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 80 [2020-12-23 07:07:22,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:07:22,867 INFO L481 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2020-12-23 07:07:22,867 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-12-23 07:07:22,867 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2020-12-23 07:07:22,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-12-23 07:07:22,868 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:07:22,868 INFO L422 BasicCegarLoop]: trace histogram [39, 30, 9, 1, 1, 1, 1, 1, 1] [2020-12-23 07:07:23,070 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:07:23,071 INFO L429 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:07:23,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:07:23,071 INFO L82 PathProgramCache]: Analyzing trace with hash 1738844952, now seen corresponding path program 28 times [2020-12-23 07:07:23,072 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:07:23,072 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [820551927] [2020-12-23 07:07:23,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:07:23,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:07:24,438 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 527 proven. 930 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-12-23 07:07:24,438 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [820551927] [2020-12-23 07:07:24,438 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1962596016] [2020-12-23 07:07:24,438 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:07:24,512 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 07:07:24,512 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:07:24,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 64 conjunts are in the unsatisfiable core [2020-12-23 07:07:24,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:07:24,780 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 527 proven. 930 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-12-23 07:07:24,780 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:07:24,780 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33] total 34 [2020-12-23 07:07:24,780 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [145405812] [2020-12-23 07:07:24,781 INFO L461 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-12-23 07:07:24,781 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:07:24,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-12-23 07:07:24,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-12-23 07:07:24,782 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand 34 states. [2020-12-23 07:07:26,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:07:26,667 INFO L93 Difference]: Finished difference Result 112 states and 117 transitions. [2020-12-23 07:07:26,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-12-23 07:07:26,668 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 84 [2020-12-23 07:07:26,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:07:26,669 INFO L225 Difference]: With dead ends: 112 [2020-12-23 07:07:26,669 INFO L226 Difference]: Without dead ends: 88 [2020-12-23 07:07:26,670 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 82 SyntacticMatches, 3 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-12-23 07:07:26,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-12-23 07:07:26,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2020-12-23 07:07:26,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-12-23 07:07:26,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2020-12-23 07:07:26,677 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 84 [2020-12-23 07:07:26,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:07:26,677 INFO L481 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2020-12-23 07:07:26,677 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-12-23 07:07:26,677 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2020-12-23 07:07:26,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-12-23 07:07:26,678 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:07:26,678 INFO L422 BasicCegarLoop]: trace histogram [40, 31, 9, 1, 1, 1, 1, 1, 1] [2020-12-23 07:07:26,884 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2020-12-23 07:07:26,885 INFO L429 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:07:26,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:07:26,885 INFO L82 PathProgramCache]: Analyzing trace with hash 2145348859, now seen corresponding path program 29 times [2020-12-23 07:07:26,886 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:07:26,886 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [819489773] [2020-12-23 07:07:26,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:07:26,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:07:28,221 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 544 proven. 992 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-12-23 07:07:28,222 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [819489773] [2020-12-23 07:07:28,222 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1325369869] [2020-12-23 07:07:28,222 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:07:49,268 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 41 check-sat command(s) [2020-12-23 07:07:49,268 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:07:49,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 82 conjunts are in the unsatisfiable core [2020-12-23 07:07:49,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:07:50,143 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 190 proven. 1406 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-23 07:07:50,144 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:07:50,144 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 40] total 41 [2020-12-23 07:07:50,145 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172919673] [2020-12-23 07:07:50,145 INFO L461 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-12-23 07:07:50,145 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:07:50,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-12-23 07:07:50,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1529, Unknown=0, NotChecked=0, Total=1640 [2020-12-23 07:07:50,147 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 41 states. [2020-12-23 07:07:52,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:07:52,520 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2020-12-23 07:07:52,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-12-23 07:07:52,521 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 86 [2020-12-23 07:07:52,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:07:52,522 INFO L225 Difference]: With dead ends: 114 [2020-12-23 07:07:52,522 INFO L226 Difference]: Without dead ends: 90 [2020-12-23 07:07:52,523 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 75 SyntacticMatches, 6 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=111, Invalid=1529, Unknown=0, NotChecked=0, Total=1640 [2020-12-23 07:07:52,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-12-23 07:07:52,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2020-12-23 07:07:52,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-12-23 07:07:52,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2020-12-23 07:07:52,529 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 86 [2020-12-23 07:07:52,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:07:52,529 INFO L481 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2020-12-23 07:07:52,529 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-12-23 07:07:52,529 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2020-12-23 07:07:52,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-12-23 07:07:52,530 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:07:52,530 INFO L422 BasicCegarLoop]: trace histogram [41, 32, 9, 1, 1, 1, 1, 1, 1] [2020-12-23 07:07:52,730 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2020-12-23 07:07:52,731 INFO L429 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:07:52,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:07:52,732 INFO L82 PathProgramCache]: Analyzing trace with hash 1953579550, now seen corresponding path program 30 times [2020-12-23 07:07:52,732 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:07:52,732 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1218016805] [2020-12-23 07:07:52,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:07:52,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:07:54,124 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 561 proven. 1056 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-12-23 07:07:54,124 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1218016805] [2020-12-23 07:07:54,124 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1822926023] [2020-12-23 07:07:54,124 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:07:56,819 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 39 check-sat command(s) [2020-12-23 07:07:56,819 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:07:56,824 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 68 conjunts are in the unsatisfiable core [2020-12-23 07:07:56,825 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:08:01,151 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 796 proven. 577 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2020-12-23 07:08:01,152 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:08:01,152 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 25] total 58 [2020-12-23 07:08:01,152 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1000786356] [2020-12-23 07:08:01,153 INFO L461 AbstractCegarLoop]: Interpolant automaton has 58 states [2020-12-23 07:08:01,153 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:08:01,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2020-12-23 07:08:01,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=658, Invalid=2648, Unknown=0, NotChecked=0, Total=3306 [2020-12-23 07:08:01,155 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand 58 states. [2020-12-23 07:08:08,789 WARN L197 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 12 [2020-12-23 07:08:12,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:08:12,146 INFO L93 Difference]: Finished difference Result 144 states and 164 transitions. [2020-12-23 07:08:12,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-12-23 07:08:12,146 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 88 [2020-12-23 07:08:12,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:08:12,147 INFO L225 Difference]: With dead ends: 144 [2020-12-23 07:08:12,147 INFO L226 Difference]: Without dead ends: 120 [2020-12-23 07:08:12,149 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 71 SyntacticMatches, 4 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 647 ImplicationChecksByTransitivity, 12.8s TimeCoverageRelationStatistics Valid=911, Invalid=4059, Unknown=0, NotChecked=0, Total=4970 [2020-12-23 07:08:12,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2020-12-23 07:08:12,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 94. [2020-12-23 07:08:12,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-12-23 07:08:12,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 96 transitions. [2020-12-23 07:08:12,156 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 96 transitions. Word has length 88 [2020-12-23 07:08:12,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:08:12,156 INFO L481 AbstractCegarLoop]: Abstraction has 94 states and 96 transitions. [2020-12-23 07:08:12,156 INFO L482 AbstractCegarLoop]: Interpolant automaton has 58 states. [2020-12-23 07:08:12,156 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 96 transitions. [2020-12-23 07:08:12,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-12-23 07:08:12,157 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:08:12,157 INFO L422 BasicCegarLoop]: trace histogram [43, 33, 10, 1, 1, 1, 1, 1, 1] [2020-12-23 07:08:12,357 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2020-12-23 07:08:12,358 INFO L429 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:08:12,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:08:12,359 INFO L82 PathProgramCache]: Analyzing trace with hash 533862566, now seen corresponding path program 31 times [2020-12-23 07:08:12,359 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:08:12,359 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [229215211] [2020-12-23 07:08:12,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:08:12,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:08:14,056 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 646 proven. 1122 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-12-23 07:08:14,057 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [229215211] [2020-12-23 07:08:14,057 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [987497645] [2020-12-23 07:08:14,057 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:08:14,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:08:14,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 70 conjunts are in the unsatisfiable core [2020-12-23 07:08:14,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:08:14,486 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 646 proven. 1122 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-12-23 07:08:14,486 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:08:14,486 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36] total 37 [2020-12-23 07:08:14,487 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1165748641] [2020-12-23 07:08:14,487 INFO L461 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-12-23 07:08:14,487 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:08:14,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-12-23 07:08:14,488 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-12-23 07:08:14,489 INFO L87 Difference]: Start difference. First operand 94 states and 96 transitions. Second operand 37 states. [2020-12-23 07:08:17,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:08:17,085 INFO L93 Difference]: Finished difference Result 122 states and 127 transitions. [2020-12-23 07:08:17,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-12-23 07:08:17,087 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 92 [2020-12-23 07:08:17,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:08:17,088 INFO L225 Difference]: With dead ends: 122 [2020-12-23 07:08:17,088 INFO L226 Difference]: Without dead ends: 96 [2020-12-23 07:08:17,089 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 90 SyntacticMatches, 3 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-12-23 07:08:17,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-12-23 07:08:17,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2020-12-23 07:08:17,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-12-23 07:08:17,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 98 transitions. [2020-12-23 07:08:17,096 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 98 transitions. Word has length 92 [2020-12-23 07:08:17,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:08:17,096 INFO L481 AbstractCegarLoop]: Abstraction has 96 states and 98 transitions. [2020-12-23 07:08:17,096 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-12-23 07:08:17,096 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 98 transitions. [2020-12-23 07:08:17,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-12-23 07:08:17,097 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:08:17,097 INFO L422 BasicCegarLoop]: trace histogram [44, 34, 10, 1, 1, 1, 1, 1, 1] [2020-12-23 07:08:17,310 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2020-12-23 07:08:17,311 INFO L429 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:08:17,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:08:17,312 INFO L82 PathProgramCache]: Analyzing trace with hash 1852458889, now seen corresponding path program 32 times [2020-12-23 07:08:17,312 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:08:17,312 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [529192323] [2020-12-23 07:08:17,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:08:17,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:08:19,178 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 665 proven. 1190 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-12-23 07:08:19,178 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [529192323] [2020-12-23 07:08:19,178 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1375667693] [2020-12-23 07:08:19,178 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:08:19,251 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 07:08:19,251 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:08:19,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 91 conjunts are in the unsatisfiable core [2020-12-23 07:08:19,255 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:08:20,434 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 07:08:20,435 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:08:20,435 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 47] total 48 [2020-12-23 07:08:20,435 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1315882528] [2020-12-23 07:08:20,436 INFO L461 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-12-23 07:08:20,436 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:08:20,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-12-23 07:08:20,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=2128, Unknown=0, NotChecked=0, Total=2256 [2020-12-23 07:08:20,437 INFO L87 Difference]: Start difference. First operand 96 states and 98 transitions. Second operand 48 states. [2020-12-23 07:08:23,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:08:23,897 INFO L93 Difference]: Finished difference Result 124 states and 129 transitions. [2020-12-23 07:08:23,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-12-23 07:08:23,899 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 94 [2020-12-23 07:08:23,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:08:23,900 INFO L225 Difference]: With dead ends: 124 [2020-12-23 07:08:23,900 INFO L226 Difference]: Without dead ends: 98 [2020-12-23 07:08:23,901 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 83 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=128, Invalid=2128, Unknown=0, NotChecked=0, Total=2256 [2020-12-23 07:08:23,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-12-23 07:08:23,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2020-12-23 07:08:23,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-12-23 07:08:23,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 100 transitions. [2020-12-23 07:08:23,907 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 100 transitions. Word has length 94 [2020-12-23 07:08:23,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:08:23,908 INFO L481 AbstractCegarLoop]: Abstraction has 98 states and 100 transitions. [2020-12-23 07:08:23,908 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-12-23 07:08:23,908 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 100 transitions. [2020-12-23 07:08:23,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-12-23 07:08:23,908 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:08:23,908 INFO L422 BasicCegarLoop]: trace histogram [45, 35, 10, 1, 1, 1, 1, 1, 1] [2020-12-23 07:08:24,109 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2020-12-23 07:08:24,109 INFO L429 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:08:24,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:08:24,110 INFO L82 PathProgramCache]: Analyzing trace with hash 2008172972, now seen corresponding path program 33 times [2020-12-23 07:08:24,111 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:08:24,111 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1694802301] [2020-12-23 07:08:24,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:08:24,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:08:25,991 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 684 proven. 1260 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-12-23 07:08:25,992 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1694802301] [2020-12-23 07:08:25,992 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1477591854] [2020-12-23 07:08:25,992 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:08:26,532 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2020-12-23 07:08:26,533 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:08:26,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 30 conjunts are in the unsatisfiable core [2020-12-23 07:08:26,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:08:29,340 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 735 proven. 100 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2020-12-23 07:08:29,340 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:08:29,340 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 13] total 49 [2020-12-23 07:08:29,340 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [441753842] [2020-12-23 07:08:29,341 INFO L461 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-12-23 07:08:29,341 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:08:29,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-12-23 07:08:29,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=2098, Unknown=0, NotChecked=0, Total=2352 [2020-12-23 07:08:29,343 INFO L87 Difference]: Start difference. First operand 98 states and 100 transitions. Second operand 49 states. [2020-12-23 07:08:35,040 WARN L197 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 12 [2020-12-23 07:08:36,302 WARN L197 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 12 [2020-12-23 07:08:37,460 WARN L197 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 12 [2020-12-23 07:08:41,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:08:41,692 INFO L93 Difference]: Finished difference Result 130 states and 138 transitions. [2020-12-23 07:08:41,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-12-23 07:08:41,693 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 96 [2020-12-23 07:08:41,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:08:41,694 INFO L225 Difference]: With dead ends: 130 [2020-12-23 07:08:41,694 INFO L226 Difference]: Without dead ends: 104 [2020-12-23 07:08:41,696 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 92 SyntacticMatches, 4 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=378, Invalid=3162, Unknown=0, NotChecked=0, Total=3540 [2020-12-23 07:08:41,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-12-23 07:08:41,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 102. [2020-12-23 07:08:41,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2020-12-23 07:08:41,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 104 transitions. [2020-12-23 07:08:41,703 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 104 transitions. Word has length 96 [2020-12-23 07:08:41,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:08:41,703 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 104 transitions. [2020-12-23 07:08:41,703 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-12-23 07:08:41,703 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 104 transitions. [2020-12-23 07:08:41,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-12-23 07:08:41,704 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:08:41,704 INFO L422 BasicCegarLoop]: trace histogram [47, 36, 11, 1, 1, 1, 1, 1, 1] [2020-12-23 07:08:41,904 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2020-12-23 07:08:41,905 INFO L429 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:08:41,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:08:41,905 INFO L82 PathProgramCache]: Analyzing trace with hash -1698225740, now seen corresponding path program 34 times [2020-12-23 07:08:41,906 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:08:41,906 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1140085472] [2020-12-23 07:08:41,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:08:41,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:08:43,998 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 777 proven. 1332 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-12-23 07:08:43,998 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1140085472] [2020-12-23 07:08:43,998 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1045405166] [2020-12-23 07:08:43,998 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:08:44,073 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 07:08:44,073 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:08:44,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 76 conjunts are in the unsatisfiable core [2020-12-23 07:08:44,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:08:44,511 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 777 proven. 1332 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-12-23 07:08:44,512 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:08:44,512 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39] total 40 [2020-12-23 07:08:44,512 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1510990913] [2020-12-23 07:08:44,513 INFO L461 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-12-23 07:08:44,513 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:08:44,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-12-23 07:08:44,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-12-23 07:08:44,517 INFO L87 Difference]: Start difference. First operand 102 states and 104 transitions. Second operand 40 states. [2020-12-23 07:08:47,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:08:47,925 INFO L93 Difference]: Finished difference Result 132 states and 137 transitions. [2020-12-23 07:08:47,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-12-23 07:08:47,927 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 100 [2020-12-23 07:08:47,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:08:47,928 INFO L225 Difference]: With dead ends: 132 [2020-12-23 07:08:47,928 INFO L226 Difference]: Without dead ends: 104 [2020-12-23 07:08:47,929 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 99 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-12-23 07:08:47,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-12-23 07:08:47,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 104. [2020-12-23 07:08:47,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2020-12-23 07:08:47,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 106 transitions. [2020-12-23 07:08:47,938 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 106 transitions. Word has length 100 [2020-12-23 07:08:47,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:08:47,938 INFO L481 AbstractCegarLoop]: Abstraction has 104 states and 106 transitions. [2020-12-23 07:08:47,939 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-12-23 07:08:47,939 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 106 transitions. [2020-12-23 07:08:47,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-12-23 07:08:47,939 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:08:47,939 INFO L422 BasicCegarLoop]: trace histogram [48, 37, 11, 1, 1, 1, 1, 1, 1] [2020-12-23 07:08:48,144 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2020-12-23 07:08:48,145 INFO L429 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:08:48,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:08:48,146 INFO L82 PathProgramCache]: Analyzing trace with hash -1778401897, now seen corresponding path program 35 times [2020-12-23 07:08:48,146 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:08:48,146 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1085297215] [2020-12-23 07:08:48,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:08:48,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:08:50,152 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 798 proven. 1406 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-12-23 07:08:50,153 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1085297215] [2020-12-23 07:08:50,153 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [789356456] [2020-12-23 07:08:50,153 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:09:55,059 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 49 check-sat command(s) [2020-12-23 07:09:55,059 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:09:55,085 WARN L261 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 126 conjunts are in the unsatisfiable core [2020-12-23 07:09:55,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:09:56,816 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 798 proven. 1406 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-12-23 07:09:56,816 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:09:56,816 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40] total 41 [2020-12-23 07:09:56,817 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521001686] [2020-12-23 07:09:56,817 INFO L461 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-12-23 07:09:56,817 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:09:56,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-12-23 07:09:56,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-12-23 07:09:56,818 INFO L87 Difference]: Start difference. First operand 104 states and 106 transitions. Second operand 41 states. [2020-12-23 07:09:59,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:09:59,621 INFO L93 Difference]: Finished difference Result 134 states and 139 transitions. [2020-12-23 07:09:59,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-12-23 07:09:59,623 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 102 [2020-12-23 07:09:59,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:09:59,624 INFO L225 Difference]: With dead ends: 134 [2020-12-23 07:09:59,624 INFO L226 Difference]: Without dead ends: 106 [2020-12-23 07:09:59,624 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 76 SyntacticMatches, 27 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-12-23 07:09:59,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-12-23 07:09:59,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2020-12-23 07:09:59,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-12-23 07:09:59,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 108 transitions. [2020-12-23 07:09:59,634 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 108 transitions. Word has length 102 [2020-12-23 07:09:59,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:09:59,634 INFO L481 AbstractCegarLoop]: Abstraction has 106 states and 108 transitions. [2020-12-23 07:09:59,634 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-12-23 07:09:59,634 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 108 transitions. [2020-12-23 07:09:59,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-12-23 07:09:59,635 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:09:59,635 INFO L422 BasicCegarLoop]: trace histogram [49, 38, 11, 1, 1, 1, 1, 1, 1] [2020-12-23 07:09:59,837 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2020-12-23 07:09:59,838 INFO L429 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:09:59,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:09:59,839 INFO L82 PathProgramCache]: Analyzing trace with hash -1518277446, now seen corresponding path program 36 times [2020-12-23 07:09:59,840 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:09:59,840 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1805243615] [2020-12-23 07:09:59,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:09:59,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:10:01,650 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 819 proven. 1482 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-12-23 07:10:01,650 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1805243615] [2020-12-23 07:10:01,651 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [765782635] [2020-12-23 07:10:01,651 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:10:05,439 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 47 check-sat command(s) [2020-12-23 07:10:05,440 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:10:05,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 38 conjunts are in the unsatisfiable core [2020-12-23 07:10:05,444 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:10:07,684 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 874 proven. 121 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2020-12-23 07:10:07,684 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:10:07,684 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 14] total 53 [2020-12-23 07:10:07,685 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [185365218] [2020-12-23 07:10:07,685 INFO L461 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-12-23 07:10:07,685 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:10:07,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-12-23 07:10:07,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=402, Invalid=2354, Unknown=0, NotChecked=0, Total=2756 [2020-12-23 07:10:07,686 INFO L87 Difference]: Start difference. First operand 106 states and 108 transitions. Second operand 53 states. [2020-12-23 07:10:11,644 WARN L197 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 12 [2020-12-23 07:10:13,193 WARN L197 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 12 [2020-12-23 07:10:15,406 WARN L197 SmtUtils]: Spent 447.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 12 [2020-12-23 07:10:18,908 WARN L197 SmtUtils]: Spent 335.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 12 [2020-12-23 07:10:21,610 WARN L197 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 12 [2020-12-23 07:10:23,550 WARN L197 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 12 [2020-12-23 07:10:25,890 WARN L197 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 12 [2020-12-23 07:10:27,469 WARN L197 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 12