/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/ps4-ll_unwindbound20.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 10:24:18,244 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 10:24:18,246 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 10:24:18,274 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-06 10:24:18,274 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-06 10:24:18,276 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-06 10:24:18,278 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-06 10:24:18,282 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-06 10:24:18,283 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-06 10:24:18,286 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-06 10:24:18,287 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-06 10:24:18,288 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-06 10:24:18,288 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 10:24:18,290 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 10:24:18,291 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 10:24:18,292 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 10:24:18,294 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 10:24:18,294 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 10:24:18,296 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 10:24:18,300 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 10:24:18,301 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 10:24:18,305 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 10:24:18,305 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 10:24:18,306 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 10:24:18,307 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 10:24:18,312 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 10:24:18,312 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 10:24:18,313 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 10:24:18,318 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-06 10:24:18,330 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 10:24:18,331 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 10:24:18,333 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 10:24:18,333 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 10:24:18,333 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 10:24:18,333 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 10:24:18,333 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 10:24:18,333 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 10:24:18,333 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 10:24:18,333 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 10:24:18,334 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 10:24:18,334 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 10:24:18,334 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 10:24:18,335 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 10:24:18,335 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 10:24:18,335 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 10:24:18,335 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 10:24:18,335 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 10:24:18,335 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 10:24:18,335 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 10:24:18,335 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 10:24:18,336 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-06 10:24:18,336 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 10:24:18,601 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 10:24:18,614 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 10:24:18,616 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 10:24:18,617 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 10:24:18,617 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 10:24:18,617 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/ps4-ll_unwindbound20.c [2021-05-06 10:24:18,661 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/43f5eb575/60654998ce074e30a1f21b5278381ae6/FLAGb4dc10324 [2021-05-06 10:24:18,977 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 10:24:18,978 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/ps4-ll_unwindbound20.c [2021-05-06 10:24:18,982 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/43f5eb575/60654998ce074e30a1f21b5278381ae6/FLAGb4dc10324 [2021-05-06 10:24:18,993 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/43f5eb575/60654998ce074e30a1f21b5278381ae6 [2021-05-06 10:24:18,995 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 10:24:18,996 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-06 10:24:18,999 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 10:24:18,999 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 10:24:19,001 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 10:24:19,002 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 10:24:18" (1/1) ... [2021-05-06 10:24:19,002 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@362b225c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 10:24:19, skipping insertion in model container [2021-05-06 10:24:19,002 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 10:24:18" (1/1) ... [2021-05-06 10:24:19,006 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 10:24:19,017 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 10:24:19,110 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/ps4-ll_unwindbound20.c[458,471] [2021-05-06 10:24:19,118 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 10:24:19,123 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 10:24:19,153 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/ps4-ll_unwindbound20.c[458,471] [2021-05-06 10:24:19,162 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 10:24:19,170 INFO L208 MainTranslator]: Completed translation [2021-05-06 10:24:19,171 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 10:24:19 WrapperNode [2021-05-06 10:24:19,171 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 10:24:19,171 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 10:24:19,171 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 10:24:19,171 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 10:24:19,177 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 10:24:19" (1/1) ... [2021-05-06 10:24:19,177 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 10:24:19" (1/1) ... [2021-05-06 10:24:19,181 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 10:24:19" (1/1) ... [2021-05-06 10:24:19,181 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 10:24:19" (1/1) ... [2021-05-06 10:24:19,184 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 10:24:19" (1/1) ... [2021-05-06 10:24:19,186 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 10:24:19" (1/1) ... [2021-05-06 10:24:19,186 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 10:24:19" (1/1) ... [2021-05-06 10:24:19,187 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 10:24:19,188 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 10:24:19,188 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 10:24:19,188 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 10:24:19,188 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 10:24:19" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 10:24:19,238 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 10:24:19,238 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 10:24:19,238 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 10:24:19,238 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 10:24:19,238 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 10:24:19,238 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 10:24:19,238 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 10:24:19,239 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 10:24:19,239 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 10:24:19,239 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 10:24:19,239 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2021-05-06 10:24:19,239 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 10:24:19,239 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 10:24:19,240 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 10:24:19,240 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 10:24:19,240 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 10:24:19,240 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 10:24:19,240 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 10:24:19,241 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 10:24:19,241 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 10:24:19,379 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 10:24:19,380 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-06 10:24:19,381 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 10:24:19 BoogieIcfgContainer [2021-05-06 10:24:19,381 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 10:24:19,381 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-06 10:24:19,381 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-06 10:24:19,382 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-06 10:24:19,383 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 10:24:19" (1/1) ... [2021-05-06 10:24:19,392 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 10:24:19 BasicIcfg [2021-05-06 10:24:19,392 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-06 10:24:19,393 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 10:24:19,393 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 10:24:19,395 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 10:24:19,395 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 10:24:18" (1/4) ... [2021-05-06 10:24:19,396 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39696cfc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 10:24:19, skipping insertion in model container [2021-05-06 10:24:19,396 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 10:24:19" (2/4) ... [2021-05-06 10:24:19,396 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39696cfc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 10:24:19, skipping insertion in model container [2021-05-06 10:24:19,396 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 10:24:19" (3/4) ... [2021-05-06 10:24:19,396 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39696cfc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 10:24:19, skipping insertion in model container [2021-05-06 10:24:19,396 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 10:24:19" (4/4) ... [2021-05-06 10:24:19,397 INFO L111 eAbstractionObserver]: Analyzing ICFG ps4-ll_unwindbound20.cJordan [2021-05-06 10:24:19,401 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-06 10:24:19,403 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 10:24:19,413 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 10:24:19,424 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 10:24:19,424 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-06 10:24:19,425 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-06 10:24:19,425 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 10:24:19,425 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 10:24:19,425 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 10:24:19,425 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 10:24:19,425 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 10:24:19,432 INFO L276 IsEmpty]: Start isEmpty. Operand has 23 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 10:24:19,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-06 10:24:19,436 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:24:19,436 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:24:19,437 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:24:19,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:24:19,440 INFO L82 PathProgramCache]: Analyzing trace with hash 1984627219, now seen corresponding path program 1 times [2021-05-06 10:24:19,444 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:24:19,445 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [981543273] [2021-05-06 10:24:19,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:24:19,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 10:24:19,582 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 10:24:19,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 10:24:19,594 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 10:24:19,594 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:24:19,595 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [981543273] [2021-05-06 10:24:19,595 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [981543273] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 10:24:19,595 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 10:24:19,595 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 10:24:19,596 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560343981] [2021-05-06 10:24:19,598 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 10:24:19,598 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:24:19,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 10:24:19,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 10:24:19,608 INFO L87 Difference]: Start difference. First operand has 23 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 10:24:19,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:24:19,651 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2021-05-06 10:24:19,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 10:24:19,652 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-06 10:24:19,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:24:19,657 INFO L225 Difference]: With dead ends: 24 [2021-05-06 10:24:19,657 INFO L226 Difference]: Without dead ends: 19 [2021-05-06 10:24:19,658 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 29.2ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 10:24:19,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-06 10:24:19,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2021-05-06 10:24:19,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 10:24:19,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2021-05-06 10:24:19,678 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 11 [2021-05-06 10:24:19,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:24:19,678 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2021-05-06 10:24:19,678 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 10:24:19,678 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2021-05-06 10:24:19,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 10:24:19,679 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:24:19,679 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:24:19,679 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 10:24:19,679 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:24:19,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:24:19,680 INFO L82 PathProgramCache]: Analyzing trace with hash 1423332195, now seen corresponding path program 1 times [2021-05-06 10:24:19,680 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:24:19,680 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1812036994] [2021-05-06 10:24:19,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:24:19,692 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:24:19,692 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1842298197] [2021-05-06 10:24:19,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:24:19,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 10:24:19,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-06 10:24:19,747 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:24:19,773 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:24:19,776 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:24:19,778 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:24:19,790 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:24:19,792 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:24:19,804 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 10:24:19,804 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:24:19,805 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1812036994] [2021-05-06 10:24:19,805 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:24:19,805 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1842298197] [2021-05-06 10:24:19,805 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1842298197] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 10:24:19,805 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 10:24:19,805 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 10:24:19,805 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1586708383] [2021-05-06 10:24:19,806 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 10:24:19,806 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:24:19,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 10:24:19,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 10:24:19,807 INFO L87 Difference]: Start difference. First operand 18 states and 21 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 10:24:19,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:24:19,814 INFO L93 Difference]: Finished difference Result 20 states and 23 transitions. [2021-05-06 10:24:19,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 10:24:19,814 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-06 10:24:19,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:24:19,815 INFO L225 Difference]: With dead ends: 20 [2021-05-06 10:24:19,815 INFO L226 Difference]: Without dead ends: 20 [2021-05-06 10:24:19,815 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.6ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 10:24:19,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-06 10:24:19,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-05-06 10:24:19,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 12 states have (on average 1.25) internal successors, (15), 13 states have internal predecessors, (15), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 10:24:19,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2021-05-06 10:24:19,818 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 12 [2021-05-06 10:24:19,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:24:19,818 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2021-05-06 10:24:19,818 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 10:24:19,818 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2021-05-06 10:24:19,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 10:24:19,819 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:24:19,819 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:24:20,037 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-06 10:24:20,038 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:24:20,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:24:20,038 INFO L82 PathProgramCache]: Analyzing trace with hash 1424404671, now seen corresponding path program 1 times [2021-05-06 10:24:20,038 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:24:20,039 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1652991826] [2021-05-06 10:24:20,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:24:20,047 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:24:20,047 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1688011375] [2021-05-06 10:24:20,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:24:20,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 10:24:20,109 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 10:24:20,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:24:20,147 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:24:20,175 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 10:24:20,175 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:24:20,177 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1652991826] [2021-05-06 10:24:20,177 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:24:20,178 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1688011375] [2021-05-06 10:24:20,178 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1688011375] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 10:24:20,178 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 10:24:20,179 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 10:24:20,179 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1735642632] [2021-05-06 10:24:20,180 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 10:24:20,180 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:24:20,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 10:24:20,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 10:24:20,182 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 10:24:20,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:24:20,215 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2021-05-06 10:24:20,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 10:24:20,216 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-06 10:24:20,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:24:20,218 INFO L225 Difference]: With dead ends: 28 [2021-05-06 10:24:20,218 INFO L226 Difference]: Without dead ends: 26 [2021-05-06 10:24:20,218 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 34.5ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 10:24:20,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-06 10:24:20,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-05-06 10:24:20,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 16 states have (on average 1.1875) internal successors, (19), 17 states have internal predecessors, (19), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 10:24:20,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2021-05-06 10:24:20,227 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 12 [2021-05-06 10:24:20,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:24:20,228 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2021-05-06 10:24:20,228 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 10:24:20,228 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2021-05-06 10:24:20,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-06 10:24:20,229 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:24:20,229 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:24:20,444 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:24:20,445 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:24:20,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:24:20,446 INFO L82 PathProgramCache]: Analyzing trace with hash -381498108, now seen corresponding path program 1 times [2021-05-06 10:24:20,446 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:24:20,446 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1952024168] [2021-05-06 10:24:20,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:24:20,456 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:24:20,456 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1296636248] [2021-05-06 10:24:20,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:24:20,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 10:24:20,501 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 10:24:20,503 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:24:20,512 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:24:20,515 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:24:20,516 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:24:20,521 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:24:20,524 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:24:20,524 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:24:20,540 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:24:20,542 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:24:20,552 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 10:24:20,552 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:24:20,552 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1952024168] [2021-05-06 10:24:20,552 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:24:20,552 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1296636248] [2021-05-06 10:24:20,552 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1296636248] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:24:20,552 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:24:20,552 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-06 10:24:20,553 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1634314420] [2021-05-06 10:24:20,553 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 10:24:20,553 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:24:20,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 10:24:20,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 10:24:20,553 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 10:24:20,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:24:20,572 INFO L93 Difference]: Finished difference Result 28 states and 31 transitions. [2021-05-06 10:24:20,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 10:24:20,572 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-05-06 10:24:20,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:24:20,572 INFO L225 Difference]: With dead ends: 28 [2021-05-06 10:24:20,573 INFO L226 Difference]: Without dead ends: 28 [2021-05-06 10:24:20,573 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 10.5ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 10:24:20,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-06 10:24:20,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-05-06 10:24:20,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 19 states have internal predecessors, (21), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 10:24:20,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2021-05-06 10:24:20,575 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 20 [2021-05-06 10:24:20,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:24:20,575 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2021-05-06 10:24:20,575 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 10:24:20,576 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2021-05-06 10:24:20,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-06 10:24:20,576 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:24:20,576 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:24:20,794 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:24:20,794 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:24:20,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:24:20,795 INFO L82 PathProgramCache]: Analyzing trace with hash -380425632, now seen corresponding path program 1 times [2021-05-06 10:24:20,795 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:24:20,795 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [673030850] [2021-05-06 10:24:20,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:24:20,802 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:24:20,802 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1740869689] [2021-05-06 10:24:20,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:24:20,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 10:24:20,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 10:24:20,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:24:20,911 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:24:20,920 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 10:24:20,920 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:24:20,920 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [673030850] [2021-05-06 10:24:20,920 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:24:20,920 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1740869689] [2021-05-06 10:24:20,920 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1740869689] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:24:20,920 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:24:20,921 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 10:24:20,921 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [762529452] [2021-05-06 10:24:20,921 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 10:24:20,921 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:24:20,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 10:24:20,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 10:24:20,921 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 10:24:20,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:24:20,954 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2021-05-06 10:24:20,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 10:24:20,954 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-05-06 10:24:20,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:24:20,955 INFO L225 Difference]: With dead ends: 36 [2021-05-06 10:24:20,955 INFO L226 Difference]: Without dead ends: 35 [2021-05-06 10:24:20,955 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 18.4ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-06 10:24:20,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-06 10:24:20,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-05-06 10:24:20,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 24 states have internal predecessors, (26), 8 states have call successors, (8), 5 states have call predecessors, (8), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 10:24:20,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2021-05-06 10:24:20,958 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 20 [2021-05-06 10:24:20,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:24:20,958 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2021-05-06 10:24:20,958 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 10:24:20,958 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2021-05-06 10:24:20,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-06 10:24:20,959 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:24:20,959 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:24:21,172 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:24:21,173 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:24:21,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:24:21,173 INFO L82 PathProgramCache]: Analyzing trace with hash 1647871298, now seen corresponding path program 1 times [2021-05-06 10:24:21,173 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:24:21,173 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [926567367] [2021-05-06 10:24:21,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:24:21,182 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:24:21,182 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [6350732] [2021-05-06 10:24:21,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:24:21,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 10:24:21,224 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-06 10:24:21,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:24:21,243 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:24:21,245 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:24:21,253 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:24:21,256 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:24:21,272 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:24:21,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:24:21,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:24:21,274 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:24:21,275 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:24:21,275 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:24:21,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:13,836 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:13,850 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:13,851 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:13,859 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:13,871 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:13,881 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 10:26:13,882 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:26:13,882 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [926567367] [2021-05-06 10:26:13,882 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:26:13,882 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [6350732] [2021-05-06 10:26:13,882 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [6350732] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:26:13,882 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:26:13,882 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-06 10:26:13,882 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753753467] [2021-05-06 10:26:13,883 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 10:26:13,883 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:26:13,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 10:26:13,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=70, Unknown=1, NotChecked=0, Total=90 [2021-05-06 10:26:13,883 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand has 10 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 10:26:13,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:26:13,967 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2021-05-06 10:26:13,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 10:26:13,967 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 26 [2021-05-06 10:26:13,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:26:13,968 INFO L225 Difference]: With dead ends: 39 [2021-05-06 10:26:13,968 INFO L226 Difference]: Without dead ends: 34 [2021-05-06 10:26:13,968 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 112602.6ms TimeCoverageRelationStatistics Valid=35, Invalid=120, Unknown=1, NotChecked=0, Total=156 [2021-05-06 10:26:13,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-06 10:26:13,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-06 10:26:13,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 23 states have internal predecessors, (25), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 10:26:13,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2021-05-06 10:26:13,971 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 26 [2021-05-06 10:26:13,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:26:13,971 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2021-05-06 10:26:13,971 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 10:26:13,971 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2021-05-06 10:26:13,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-06 10:26:13,972 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:26:13,972 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:26:14,180 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-06 10:26:14,181 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:26:14,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:26:14,181 INFO L82 PathProgramCache]: Analyzing trace with hash -382724699, now seen corresponding path program 2 times [2021-05-06 10:26:14,181 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:26:14,181 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1001522838] [2021-05-06 10:26:14,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:26:14,188 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:26:14,188 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [818048656] [2021-05-06 10:26:14,188 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:26:14,241 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 10:26:14,241 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 10:26:14,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 10:26:14,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:26:14,252 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:14,253 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:14,254 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:14,259 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:14,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:14,261 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:14,276 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:14,278 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:14,278 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:14,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:14,294 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:14,302 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 10:26:14,302 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:26:14,303 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1001522838] [2021-05-06 10:26:14,303 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:26:14,303 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [818048656] [2021-05-06 10:26:14,303 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [818048656] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:26:14,303 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:26:14,303 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 10:26:14,303 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1934214062] [2021-05-06 10:26:14,303 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 10:26:14,303 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:26:14,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 10:26:14,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 10:26:14,304 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 10:26:14,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:26:14,331 INFO L93 Difference]: Finished difference Result 36 states and 39 transitions. [2021-05-06 10:26:14,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 10:26:14,331 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 28 [2021-05-06 10:26:14,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:26:14,332 INFO L225 Difference]: With dead ends: 36 [2021-05-06 10:26:14,332 INFO L226 Difference]: Without dead ends: 36 [2021-05-06 10:26:14,332 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 18.9ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-06 10:26:14,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-06 10:26:14,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-05-06 10:26:14,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 24 states have (on average 1.125) internal successors, (27), 25 states have internal predecessors, (27), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 10:26:14,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 39 transitions. [2021-05-06 10:26:14,334 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 39 transitions. Word has length 28 [2021-05-06 10:26:14,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:26:14,335 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 39 transitions. [2021-05-06 10:26:14,335 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 10:26:14,335 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 39 transitions. [2021-05-06 10:26:14,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-06 10:26:14,335 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:26:14,335 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:26:14,548 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:26:14,549 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:26:14,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:26:14,549 INFO L82 PathProgramCache]: Analyzing trace with hash -381652223, now seen corresponding path program 2 times [2021-05-06 10:26:14,549 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:26:14,549 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [272269499] [2021-05-06 10:26:14,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:26:14,556 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:26:14,556 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [909101742] [2021-05-06 10:26:14,556 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:26:14,615 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 10:26:14,615 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 10:26:14,615 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-06 10:26:14,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:26:14,711 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:14,720 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 10:26:14,720 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:26:14,720 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [272269499] [2021-05-06 10:26:14,720 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:26:14,720 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [909101742] [2021-05-06 10:26:14,720 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [909101742] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:26:14,721 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:26:14,721 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-06 10:26:14,721 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [221196565] [2021-05-06 10:26:14,721 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 10:26:14,721 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:26:14,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 10:26:14,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-06 10:26:14,722 INFO L87 Difference]: Start difference. First operand 36 states and 39 transitions. Second operand has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 10:26:28,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:26:28,476 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2021-05-06 10:26:28,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 10:26:28,476 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 28 [2021-05-06 10:26:28,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:26:28,477 INFO L225 Difference]: With dead ends: 44 [2021-05-06 10:26:28,477 INFO L226 Difference]: Without dead ends: 43 [2021-05-06 10:26:28,477 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 54.3ms TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-05-06 10:26:28,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-06 10:26:28,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2021-05-06 10:26:28,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 30 states have internal predecessors, (32), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 10:26:28,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2021-05-06 10:26:28,481 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 28 [2021-05-06 10:26:28,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:26:28,481 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2021-05-06 10:26:28,481 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 10:26:28,481 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2021-05-06 10:26:28,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-06 10:26:28,481 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:26:28,481 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:26:28,684 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:26:28,685 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:26:28,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:26:28,685 INFO L82 PathProgramCache]: Analyzing trace with hash 31133987, now seen corresponding path program 2 times [2021-05-06 10:26:28,685 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:26:28,685 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1114528765] [2021-05-06 10:26:28,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:26:28,691 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:26:28,691 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1178530067] [2021-05-06 10:26:28,691 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:26:28,752 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 10:26:28,753 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 10:26:28,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 32 conjunts are in the unsatisfiable core [2021-05-06 10:26:28,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:26:28,835 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:28,836 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:28,837 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:28,837 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:28,861 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:28,874 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:28,875 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:28,883 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:28,894 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:28,904 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 10 proven. 14 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-06 10:26:28,904 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:26:28,904 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1114528765] [2021-05-06 10:26:28,904 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:26:28,904 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1178530067] [2021-05-06 10:26:28,904 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1178530067] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:26:28,904 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:26:28,904 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-06 10:26:28,904 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1872778749] [2021-05-06 10:26:28,905 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 10:26:28,905 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:26:28,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 10:26:28,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-05-06 10:26:28,906 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand has 11 states, 10 states have (on average 2.1) internal successors, (21), 9 states have internal predecessors, (21), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 10:26:29,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:26:29,015 INFO L93 Difference]: Finished difference Result 47 states and 50 transitions. [2021-05-06 10:26:29,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 10:26:29,016 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.1) internal successors, (21), 9 states have internal predecessors, (21), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 34 [2021-05-06 10:26:29,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:26:29,016 INFO L225 Difference]: With dead ends: 47 [2021-05-06 10:26:29,017 INFO L226 Difference]: Without dead ends: 42 [2021-05-06 10:26:29,017 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 87.5ms TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-06 10:26:29,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-06 10:26:29,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-05-06 10:26:29,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 29 states have internal predecessors, (31), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 10:26:29,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 45 transitions. [2021-05-06 10:26:29,030 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 45 transitions. Word has length 34 [2021-05-06 10:26:29,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:26:29,030 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 45 transitions. [2021-05-06 10:26:29,030 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 2.1) internal successors, (21), 9 states have internal predecessors, (21), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 10:26:29,030 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 45 transitions. [2021-05-06 10:26:29,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-06 10:26:29,031 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:26:29,031 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:26:29,240 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-06 10:26:29,241 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:26:29,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:26:29,241 INFO L82 PathProgramCache]: Analyzing trace with hash 710880582, now seen corresponding path program 3 times [2021-05-06 10:26:29,241 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:26:29,241 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1641343992] [2021-05-06 10:26:29,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:26:29,248 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:26:29,248 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2050352609] [2021-05-06 10:26:29,249 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:26:29,301 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-06 10:26:29,301 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 10:26:29,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 10:26:29,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:26:29,315 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:29,317 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:29,317 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:29,320 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:29,326 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:29,326 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:29,339 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:29,340 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:29,345 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:29,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:29,360 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:29,360 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:29,374 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:29,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:29,384 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 10:26:29,384 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:26:29,384 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1641343992] [2021-05-06 10:26:29,384 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:26:29,384 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2050352609] [2021-05-06 10:26:29,384 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2050352609] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:26:29,384 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:26:29,384 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 10:26:29,384 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1178210570] [2021-05-06 10:26:29,384 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 10:26:29,385 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:26:29,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 10:26:29,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-06 10:26:29,385 INFO L87 Difference]: Start difference. First operand 42 states and 45 transitions. Second operand has 7 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 6 states have internal predecessors, (26), 6 states have call successors, (6), 6 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 10:26:29,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:26:29,433 INFO L93 Difference]: Finished difference Result 44 states and 47 transitions. [2021-05-06 10:26:29,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 10:26:29,434 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 6 states have internal predecessors, (26), 6 states have call successors, (6), 6 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 36 [2021-05-06 10:26:29,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:26:29,435 INFO L225 Difference]: With dead ends: 44 [2021-05-06 10:26:29,435 INFO L226 Difference]: Without dead ends: 44 [2021-05-06 10:26:29,436 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 26.8ms TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-05-06 10:26:29,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-06 10:26:29,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-05-06 10:26:29,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 30 states have (on average 1.1) internal successors, (33), 31 states have internal predecessors, (33), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 10:26:29,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2021-05-06 10:26:29,441 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 36 [2021-05-06 10:26:29,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:26:29,441 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2021-05-06 10:26:29,441 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 6 states have internal predecessors, (26), 6 states have call successors, (6), 6 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 10:26:29,442 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2021-05-06 10:26:29,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-06 10:26:29,444 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:26:29,445 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:26:29,645 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:26:29,645 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:26:29,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:26:29,646 INFO L82 PathProgramCache]: Analyzing trace with hash 711953058, now seen corresponding path program 3 times [2021-05-06 10:26:29,646 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:26:29,646 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1074249593] [2021-05-06 10:26:29,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:26:29,652 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:26:29,652 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1277656681] [2021-05-06 10:26:29,652 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:26:29,712 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-06 10:26:29,712 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 10:26:29,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-06 10:26:29,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:26:29,784 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:29,786 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:29,793 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:29,800 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 22 proven. 1 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-06 10:26:29,800 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:26:29,800 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1074249593] [2021-05-06 10:26:29,800 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:26:29,800 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1277656681] [2021-05-06 10:26:29,800 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1277656681] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:26:29,800 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:26:29,800 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 10:26:29,800 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585041706] [2021-05-06 10:26:29,801 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 10:26:29,801 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:26:29,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 10:26:29,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-05-06 10:26:29,802 INFO L87 Difference]: Start difference. First operand 44 states and 47 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-06 10:26:29,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:26:29,835 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2021-05-06 10:26:29,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 10:26:29,836 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 36 [2021-05-06 10:26:29,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:26:29,836 INFO L225 Difference]: With dead ends: 48 [2021-05-06 10:26:29,836 INFO L226 Difference]: Without dead ends: 45 [2021-05-06 10:26:29,836 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 31.6ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-06 10:26:29,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-06 10:26:29,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-05-06 10:26:29,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 32 states have (on average 1.0625) internal successors, (34), 32 states have internal predecessors, (34), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 10:26:29,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2021-05-06 10:26:29,838 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 36 [2021-05-06 10:26:29,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:26:29,838 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2021-05-06 10:26:29,838 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-06 10:26:29,838 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2021-05-06 10:26:29,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-06 10:26:29,839 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:26:29,839 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:26:30,044 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:26:30,045 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:26:30,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:26:30,045 INFO L82 PathProgramCache]: Analyzing trace with hash 1474833412, now seen corresponding path program 3 times [2021-05-06 10:26:30,046 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:26:30,046 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [824693774] [2021-05-06 10:26:30,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:26:30,062 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:26:30,062 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [729531792] [2021-05-06 10:26:30,062 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:26:30,120 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-06 10:26:30,121 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 10:26:30,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-06 10:26:30,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:26:30,184 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:30,185 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:30,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:30,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:30,194 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:30,204 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:30,205 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:30,208 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:30,216 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:30,226 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 8 proven. 24 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-06 10:26:30,226 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:26:30,226 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [824693774] [2021-05-06 10:26:30,226 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:26:30,226 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [729531792] [2021-05-06 10:26:30,226 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [729531792] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:26:30,226 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:26:30,226 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-06 10:26:30,226 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1458286963] [2021-05-06 10:26:30,226 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 10:26:30,226 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:26:30,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 10:26:30,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-05-06 10:26:30,227 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand has 9 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 10:26:30,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:26:30,279 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2021-05-06 10:26:30,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 10:26:30,279 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 42 [2021-05-06 10:26:30,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:26:30,280 INFO L225 Difference]: With dead ends: 50 [2021-05-06 10:26:30,280 INFO L226 Difference]: Without dead ends: 47 [2021-05-06 10:26:30,280 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 46.1ms TimeCoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-05-06 10:26:30,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-06 10:26:30,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2021-05-06 10:26:30,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 33 states have (on average 1.0606060606060606) internal successors, (35), 33 states have internal predecessors, (35), 8 states have call successors, (8), 7 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 10:26:30,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2021-05-06 10:26:30,282 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 42 [2021-05-06 10:26:30,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:26:30,282 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2021-05-06 10:26:30,282 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 10:26:30,282 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2021-05-06 10:26:30,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-06 10:26:30,283 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:26:30,283 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:26:30,488 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-06 10:26:30,489 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:26:30,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:26:30,489 INFO L82 PathProgramCache]: Analyzing trace with hash 831591399, now seen corresponding path program 4 times [2021-05-06 10:26:30,489 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:26:30,489 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [8545555] [2021-05-06 10:26:30,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:26:30,493 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:26:30,493 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2105893198] [2021-05-06 10:26:30,493 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:26:30,550 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 10:26:30,551 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 10:26:30,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-06 10:26:30,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:26:30,560 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:30,561 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:30,561 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:30,565 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:30,566 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:30,566 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:30,578 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:30,579 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:30,579 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:30,592 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:30,593 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:30,593 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:30,606 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:30,607 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:30,607 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:30,621 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:30,622 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:30,631 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 10:26:30,631 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:26:30,631 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [8545555] [2021-05-06 10:26:30,631 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:26:30,631 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2105893198] [2021-05-06 10:26:30,631 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2105893198] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:26:30,631 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:26:30,631 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-06 10:26:30,631 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028305426] [2021-05-06 10:26:30,631 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 10:26:30,631 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:26:30,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 10:26:30,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-06 10:26:30,632 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 10:26:30,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:26:30,684 INFO L93 Difference]: Finished difference Result 53 states and 54 transitions. [2021-05-06 10:26:30,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 10:26:30,684 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 44 [2021-05-06 10:26:30,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:26:30,685 INFO L225 Difference]: With dead ends: 53 [2021-05-06 10:26:30,686 INFO L226 Difference]: Without dead ends: 53 [2021-05-06 10:26:30,686 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 40.1ms TimeCoverageRelationStatistics Valid=51, Invalid=81, Unknown=0, NotChecked=0, Total=132 [2021-05-06 10:26:30,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-06 10:26:30,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-05-06 10:26:30,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 38 states have internal predecessors, (40), 8 states have call successors, (8), 8 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 10:26:30,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2021-05-06 10:26:30,690 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 44 [2021-05-06 10:26:30,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:26:30,690 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2021-05-06 10:26:30,690 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 10:26:30,690 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2021-05-06 10:26:30,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-06 10:26:30,691 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:26:30,691 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:26:30,893 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-06 10:26:30,893 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:26:30,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:26:30,894 INFO L82 PathProgramCache]: Analyzing trace with hash -1805593115, now seen corresponding path program 4 times [2021-05-06 10:26:30,894 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:26:30,894 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1518708334] [2021-05-06 10:26:30,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:26:30,898 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:26:30,898 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1567610103] [2021-05-06 10:26:30,898 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:26:31,059 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 10:26:31,060 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 10:26:31,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-06 10:26:31,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:26:31,156 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:31,156 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:31,157 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:31,157 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:31,164 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:31,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:31,175 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:31,178 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:31,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:31,196 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 10 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-06 10:26:31,197 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:26:31,197 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1518708334] [2021-05-06 10:26:31,197 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:26:31,197 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1567610103] [2021-05-06 10:26:31,197 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1567610103] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:26:31,197 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:26:31,197 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-06 10:26:31,197 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [896226098] [2021-05-06 10:26:31,197 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 10:26:31,197 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:26:31,198 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 10:26:31,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-05-06 10:26:31,198 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand has 10 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 9 states have internal predecessors, (24), 7 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 10:26:31,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:26:31,269 INFO L93 Difference]: Finished difference Result 58 states and 60 transitions. [2021-05-06 10:26:31,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 10:26:31,269 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 9 states have internal predecessors, (24), 7 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 50 [2021-05-06 10:26:31,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:26:31,270 INFO L225 Difference]: With dead ends: 58 [2021-05-06 10:26:31,270 INFO L226 Difference]: Without dead ends: 55 [2021-05-06 10:26:31,270 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 59.5ms TimeCoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2021-05-06 10:26:31,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-06 10:26:31,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-05-06 10:26:31,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 39 states have internal predecessors, (41), 9 states have call successors, (9), 8 states have call predecessors, (9), 6 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 10:26:31,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2021-05-06 10:26:31,272 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 50 [2021-05-06 10:26:31,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:26:31,272 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2021-05-06 10:26:31,272 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 9 states have internal predecessors, (24), 7 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 10:26:31,272 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2021-05-06 10:26:31,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-06 10:26:31,273 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:26:31,273 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:26:31,480 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-06 10:26:31,480 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:26:31,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:26:31,480 INFO L82 PathProgramCache]: Analyzing trace with hash 847694216, now seen corresponding path program 5 times [2021-05-06 10:26:31,480 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:26:31,480 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [344391694] [2021-05-06 10:26:31,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:26:31,484 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:26:31,485 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1369100427] [2021-05-06 10:26:31,485 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:26:31,547 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-06 10:26:31,547 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 10:26:31,547 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-06 10:26:31,549 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:26:31,556 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:31,557 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:31,557 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:31,562 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:31,563 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:31,563 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:31,575 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:31,577 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:31,577 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:31,590 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:31,591 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:31,591 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:31,612 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:31,613 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:31,614 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:31,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:31,628 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:31,628 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:31,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:31,650 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:31,659 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 10:26:31,659 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:26:31,659 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [344391694] [2021-05-06 10:26:31,659 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:26:31,659 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1369100427] [2021-05-06 10:26:31,659 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1369100427] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:26:31,659 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:26:31,659 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-06 10:26:31,660 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759519480] [2021-05-06 10:26:31,660 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 10:26:31,660 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:26:31,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 10:26:31,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-06 10:26:31,660 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand has 9 states, 9 states have (on average 4.222222222222222) internal successors, (38), 8 states have internal predecessors, (38), 8 states have call successors, (8), 8 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 10:26:31,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:26:31,719 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2021-05-06 10:26:31,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 10:26:31,719 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.222222222222222) internal successors, (38), 8 states have internal predecessors, (38), 8 states have call successors, (8), 8 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 52 [2021-05-06 10:26:31,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:26:31,720 INFO L225 Difference]: With dead ends: 61 [2021-05-06 10:26:31,720 INFO L226 Difference]: Without dead ends: 61 [2021-05-06 10:26:31,721 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 46.0ms TimeCoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2021-05-06 10:26:31,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-06 10:26:31,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2021-05-06 10:26:31,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 44 states have (on average 1.0454545454545454) internal successors, (46), 44 states have internal predecessors, (46), 9 states have call successors, (9), 9 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 10:26:31,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2021-05-06 10:26:31,725 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 52 [2021-05-06 10:26:31,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:26:31,725 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2021-05-06 10:26:31,725 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 4.222222222222222) internal successors, (38), 8 states have internal predecessors, (38), 8 states have call successors, (8), 8 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 10:26:31,725 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2021-05-06 10:26:31,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 10:26:31,727 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:26:31,727 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:26:31,940 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:26:31,941 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:26:31,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:26:31,941 INFO L82 PathProgramCache]: Analyzing trace with hash 1447431878, now seen corresponding path program 5 times [2021-05-06 10:26:31,941 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:26:31,941 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [767596684] [2021-05-06 10:26:31,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:26:31,945 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:26:31,945 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [525145546] [2021-05-06 10:26:31,945 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:26:32,080 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-06 10:26:32,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 10:26:32,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-06 10:26:32,089 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:26:32,183 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:32,184 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:32,185 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:32,185 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:32,193 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:32,203 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:32,204 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:32,207 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:32,216 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:32,225 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 12 proven. 60 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-05-06 10:26:32,225 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:26:32,226 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [767596684] [2021-05-06 10:26:32,226 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:26:32,226 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [525145546] [2021-05-06 10:26:32,226 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [525145546] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:26:32,226 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:26:32,226 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-06 10:26:32,226 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1913659228] [2021-05-06 10:26:32,226 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 10:26:32,226 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:26:32,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 10:26:32,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2021-05-06 10:26:32,227 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand has 11 states, 10 states have (on average 2.7) internal successors, (27), 10 states have internal predecessors, (27), 8 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 10:26:32,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:26:32,301 INFO L93 Difference]: Finished difference Result 66 states and 68 transitions. [2021-05-06 10:26:32,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 10:26:32,301 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.7) internal successors, (27), 10 states have internal predecessors, (27), 8 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 58 [2021-05-06 10:26:32,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:26:32,304 INFO L225 Difference]: With dead ends: 66 [2021-05-06 10:26:32,304 INFO L226 Difference]: Without dead ends: 63 [2021-05-06 10:26:32,305 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 68.8ms TimeCoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2021-05-06 10:26:32,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-06 10:26:32,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-05-06 10:26:32,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 45 states have (on average 1.0444444444444445) internal successors, (47), 45 states have internal predecessors, (47), 10 states have call successors, (10), 9 states have call predecessors, (10), 7 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 10:26:32,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 65 transitions. [2021-05-06 10:26:32,309 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 65 transitions. Word has length 58 [2021-05-06 10:26:32,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:26:32,309 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 65 transitions. [2021-05-06 10:26:32,310 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 2.7) internal successors, (27), 10 states have internal predecessors, (27), 8 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 10:26:32,310 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 65 transitions. [2021-05-06 10:26:32,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-05-06 10:26:32,310 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:26:32,310 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:26:32,521 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:26:32,521 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:26:32,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:26:32,521 INFO L82 PathProgramCache]: Analyzing trace with hash 268521001, now seen corresponding path program 6 times [2021-05-06 10:26:32,521 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:26:32,522 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [157160162] [2021-05-06 10:26:32,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:26:32,526 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:26:32,526 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [386510441] [2021-05-06 10:26:32,526 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:26:32,585 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-06 10:26:32,585 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 10:26:32,586 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-06 10:26:32,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:26:32,593 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:32,594 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:32,594 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:32,599 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:32,600 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:32,600 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:32,611 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:32,612 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:32,612 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:32,623 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:32,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:32,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:32,636 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:32,637 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:32,638 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:32,652 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:32,653 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:32,653 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:32,666 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:32,667 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:32,667 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:32,681 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:32,682 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:32,691 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 12 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 10:26:32,691 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:26:32,691 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [157160162] [2021-05-06 10:26:32,691 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:26:32,691 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [386510441] [2021-05-06 10:26:32,691 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [386510441] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:26:32,691 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:26:32,691 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-06 10:26:32,691 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2098562590] [2021-05-06 10:26:32,691 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 10:26:32,692 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:26:32,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 10:26:32,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-06 10:26:32,692 INFO L87 Difference]: Start difference. First operand 63 states and 65 transitions. Second operand has 10 states, 10 states have (on average 4.4) internal successors, (44), 9 states have internal predecessors, (44), 9 states have call successors, (9), 9 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 10:26:32,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:26:32,776 INFO L93 Difference]: Finished difference Result 69 states and 70 transitions. [2021-05-06 10:26:32,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 10:26:32,776 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.4) internal successors, (44), 9 states have internal predecessors, (44), 9 states have call successors, (9), 9 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 60 [2021-05-06 10:26:32,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:26:32,777 INFO L225 Difference]: With dead ends: 69 [2021-05-06 10:26:32,777 INFO L226 Difference]: Without dead ends: 69 [2021-05-06 10:26:32,777 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 57.9ms TimeCoverageRelationStatistics Valid=92, Invalid=148, Unknown=0, NotChecked=0, Total=240 [2021-05-06 10:26:32,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-06 10:26:32,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2021-05-06 10:26:32,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 50 states have (on average 1.04) internal successors, (52), 50 states have internal predecessors, (52), 10 states have call successors, (10), 10 states have call predecessors, (10), 8 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 10:26:32,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2021-05-06 10:26:32,779 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 60 [2021-05-06 10:26:32,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:26:32,779 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2021-05-06 10:26:32,779 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 4.4) internal successors, (44), 9 states have internal predecessors, (44), 9 states have call successors, (9), 9 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 10:26:32,779 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2021-05-06 10:26:32,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-06 10:26:32,780 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:26:32,780 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:26:32,988 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:26:32,989 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:26:32,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:26:32,996 INFO L82 PathProgramCache]: Analyzing trace with hash -1416046937, now seen corresponding path program 6 times [2021-05-06 10:26:32,996 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:26:32,996 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2020010613] [2021-05-06 10:26:32,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:26:32,999 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:26:33,000 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [215417193] [2021-05-06 10:26:33,000 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:26:33,178 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-06 10:26:33,178 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 10:26:33,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-06 10:26:33,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:26:33,206 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,207 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,223 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,224 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,239 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,240 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,262 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,263 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,306 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,307 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,308 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,308 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,315 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,341 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,345 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,414 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,426 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 14 proven. 84 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-05-06 10:26:33,426 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:26:33,426 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2020010613] [2021-05-06 10:26:33,427 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:26:33,427 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [215417193] [2021-05-06 10:26:33,427 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [215417193] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:26:33,427 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:26:33,427 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-06 10:26:33,427 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1333934480] [2021-05-06 10:26:33,427 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 10:26:33,427 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:26:33,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 10:26:33,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2021-05-06 10:26:33,428 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand has 12 states, 11 states have (on average 2.727272727272727) internal successors, (30), 11 states have internal predecessors, (30), 9 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 10:26:33,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:26:33,545 INFO L93 Difference]: Finished difference Result 74 states and 76 transitions. [2021-05-06 10:26:33,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 10:26:33,546 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.727272727272727) internal successors, (30), 11 states have internal predecessors, (30), 9 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Word has length 66 [2021-05-06 10:26:33,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:26:33,546 INFO L225 Difference]: With dead ends: 74 [2021-05-06 10:26:33,546 INFO L226 Difference]: Without dead ends: 71 [2021-05-06 10:26:33,546 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 147.8ms TimeCoverageRelationStatistics Valid=29, Invalid=153, Unknown=0, NotChecked=0, Total=182 [2021-05-06 10:26:33,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-06 10:26:33,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2021-05-06 10:26:33,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 51 states have (on average 1.0392156862745099) internal successors, (53), 51 states have internal predecessors, (53), 11 states have call successors, (11), 10 states have call predecessors, (11), 8 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 10:26:33,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2021-05-06 10:26:33,548 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 66 [2021-05-06 10:26:33,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:26:33,549 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2021-05-06 10:26:33,549 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 11 states have (on average 2.727272727272727) internal successors, (30), 11 states have internal predecessors, (30), 9 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 10:26:33,549 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2021-05-06 10:26:33,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-06 10:26:33,549 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:26:33,549 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:26:33,752 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-06 10:26:33,753 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:26:33,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:26:33,753 INFO L82 PathProgramCache]: Analyzing trace with hash 1539416522, now seen corresponding path program 7 times [2021-05-06 10:26:33,753 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:26:33,753 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [771789283] [2021-05-06 10:26:33,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:26:33,757 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:26:33,757 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [51418140] [2021-05-06 10:26:33,757 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:26:33,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 10:26:33,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-06 10:26:33,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:26:33,814 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,815 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,817 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,826 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,827 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,827 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,838 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,839 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,839 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,866 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,867 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,867 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,879 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,881 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,896 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,897 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,897 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,921 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,922 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,923 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,936 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,937 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,937 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,950 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,951 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:33,959 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 14 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 10:26:33,960 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:26:33,960 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [771789283] [2021-05-06 10:26:33,960 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:26:33,960 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [51418140] [2021-05-06 10:26:33,960 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [51418140] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:26:33,960 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:26:33,960 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-06 10:26:33,960 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [380544228] [2021-05-06 10:26:33,961 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 10:26:33,961 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:26:33,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 10:26:33,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-06 10:26:33,962 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand has 11 states, 11 states have (on average 4.545454545454546) internal successors, (50), 10 states have internal predecessors, (50), 10 states have call successors, (10), 10 states have call predecessors, (10), 8 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 10:26:34,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:26:34,042 INFO L93 Difference]: Finished difference Result 77 states and 78 transitions. [2021-05-06 10:26:34,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 10:26:34,042 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.545454545454546) internal successors, (50), 10 states have internal predecessors, (50), 10 states have call successors, (10), 10 states have call predecessors, (10), 8 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Word has length 68 [2021-05-06 10:26:34,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:26:34,042 INFO L225 Difference]: With dead ends: 77 [2021-05-06 10:26:34,042 INFO L226 Difference]: Without dead ends: 77 [2021-05-06 10:26:34,043 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 68.2ms TimeCoverageRelationStatistics Valid=117, Invalid=189, Unknown=0, NotChecked=0, Total=306 [2021-05-06 10:26:34,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-06 10:26:34,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2021-05-06 10:26:34,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 56 states have (on average 1.0357142857142858) internal successors, (58), 56 states have internal predecessors, (58), 11 states have call successors, (11), 11 states have call predecessors, (11), 9 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 10:26:34,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 78 transitions. [2021-05-06 10:26:34,045 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 78 transitions. Word has length 68 [2021-05-06 10:26:34,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:26:34,045 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 78 transitions. [2021-05-06 10:26:34,045 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 4.545454545454546) internal successors, (50), 10 states have internal predecessors, (50), 10 states have call successors, (10), 10 states have call predecessors, (10), 8 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 10:26:34,045 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 78 transitions. [2021-05-06 10:26:34,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-06 10:26:34,046 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:26:34,046 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:26:34,260 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-06 10:26:34,261 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:26:34,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:26:34,261 INFO L82 PathProgramCache]: Analyzing trace with hash 291122568, now seen corresponding path program 7 times [2021-05-06 10:26:34,261 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:26:34,261 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1468364899] [2021-05-06 10:26:34,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:26:34,267 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:26:34,267 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [955830676] [2021-05-06 10:26:34,267 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:26:34,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 10:26:34,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 36 conjunts are in the unsatisfiable core [2021-05-06 10:26:34,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:26:34,671 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:34,672 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:34,673 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:34,673 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:34,679 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:34,691 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:34,692 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:34,695 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:34,706 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:34,718 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 16 proven. 112 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-05-06 10:26:34,718 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:26:34,718 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1468364899] [2021-05-06 10:26:34,718 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:26:34,718 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [955830676] [2021-05-06 10:26:34,718 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [955830676] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:26:34,718 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:26:34,718 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-06 10:26:34,718 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459653722] [2021-05-06 10:26:34,718 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 10:26:34,718 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:26:34,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 10:26:34,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2021-05-06 10:26:34,719 INFO L87 Difference]: Start difference. First operand 77 states and 78 transitions. Second operand has 13 states, 12 states have (on average 2.75) internal successors, (33), 12 states have internal predecessors, (33), 10 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 10:26:34,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:26:34,861 INFO L93 Difference]: Finished difference Result 82 states and 84 transitions. [2021-05-06 10:26:34,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 10:26:34,861 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.75) internal successors, (33), 12 states have internal predecessors, (33), 10 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Word has length 74 [2021-05-06 10:26:34,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:26:34,862 INFO L225 Difference]: With dead ends: 82 [2021-05-06 10:26:34,862 INFO L226 Difference]: Without dead ends: 79 [2021-05-06 10:26:34,862 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 101.2ms TimeCoverageRelationStatistics Valid=31, Invalid=179, Unknown=0, NotChecked=0, Total=210 [2021-05-06 10:26:34,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-05-06 10:26:34,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2021-05-06 10:26:34,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 57 states have (on average 1.0350877192982457) internal successors, (59), 57 states have internal predecessors, (59), 12 states have call successors, (12), 11 states have call predecessors, (12), 9 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 10:26:34,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 81 transitions. [2021-05-06 10:26:34,864 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 81 transitions. Word has length 74 [2021-05-06 10:26:34,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:26:34,864 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 81 transitions. [2021-05-06 10:26:34,864 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 12 states have (on average 2.75) internal successors, (33), 12 states have internal predecessors, (33), 10 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 10:26:34,864 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 81 transitions. [2021-05-06 10:26:34,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 10:26:34,864 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:26:34,865 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:26:35,069 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-05-06 10:26:35,069 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:26:35,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:26:35,070 INFO L82 PathProgramCache]: Analyzing trace with hash 1451803755, now seen corresponding path program 8 times [2021-05-06 10:26:35,070 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:26:35,070 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1428242527] [2021-05-06 10:26:35,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:26:35,073 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:26:35,074 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1407485218] [2021-05-06 10:26:35,074 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2021-05-06 10:26:35,127 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 10:26:35,127 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 10:26:35,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-06 10:26:35,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:26:35,136 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:35,137 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:35,140 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:35,142 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:35,143 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:35,144 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:35,154 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:35,155 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:35,155 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:35,166 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:35,167 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:35,167 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:35,180 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:35,182 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:35,182 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:35,195 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:35,197 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:35,197 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:35,209 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:35,210 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:35,211 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:35,223 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:35,224 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:35,224 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:35,238 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:35,239 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:35,240 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:35,254 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:35,255 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:35,264 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 16 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 10:26:35,264 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:26:35,264 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1428242527] [2021-05-06 10:26:35,264 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:26:35,264 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1407485218] [2021-05-06 10:26:35,264 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1407485218] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:26:35,264 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:26:35,264 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-06 10:26:35,264 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1722942693] [2021-05-06 10:26:35,265 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 10:26:35,265 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:26:35,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 10:26:35,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2021-05-06 10:26:35,265 INFO L87 Difference]: Start difference. First operand 79 states and 81 transitions. Second operand has 12 states, 12 states have (on average 4.666666666666667) internal successors, (56), 11 states have internal predecessors, (56), 11 states have call successors, (11), 11 states have call predecessors, (11), 9 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 10:26:35,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:26:35,378 INFO L93 Difference]: Finished difference Result 85 states and 86 transitions. [2021-05-06 10:26:35,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 10:26:35,378 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.666666666666667) internal successors, (56), 11 states have internal predecessors, (56), 11 states have call successors, (11), 11 states have call predecessors, (11), 9 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Word has length 76 [2021-05-06 10:26:35,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:26:35,379 INFO L225 Difference]: With dead ends: 85 [2021-05-06 10:26:35,379 INFO L226 Difference]: Without dead ends: 85 [2021-05-06 10:26:35,379 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 84.3ms TimeCoverageRelationStatistics Valid=145, Invalid=235, Unknown=0, NotChecked=0, Total=380 [2021-05-06 10:26:35,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-05-06 10:26:35,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2021-05-06 10:26:35,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 62 states have (on average 1.032258064516129) internal successors, (64), 62 states have internal predecessors, (64), 12 states have call successors, (12), 12 states have call predecessors, (12), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 10:26:35,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 86 transitions. [2021-05-06 10:26:35,381 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 86 transitions. Word has length 76 [2021-05-06 10:26:35,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:26:35,381 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 86 transitions. [2021-05-06 10:26:35,381 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 4.666666666666667) internal successors, (56), 11 states have internal predecessors, (56), 11 states have call successors, (11), 11 states have call predecessors, (11), 9 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 10:26:35,381 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 86 transitions. [2021-05-06 10:26:35,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 10:26:35,381 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:26:35,381 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:26:35,584 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-06 10:26:35,585 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:26:35,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:26:35,585 INFO L82 PathProgramCache]: Analyzing trace with hash 1938494313, now seen corresponding path program 8 times [2021-05-06 10:26:35,585 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:26:35,585 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [922034319] [2021-05-06 10:26:35,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:26:35,589 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:26:35,589 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1262516249] [2021-05-06 10:26:35,589 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2021-05-06 10:26:36,088 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 10:26:36,088 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 10:26:36,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 40 conjunts are in the unsatisfiable core [2021-05-06 10:26:36,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:26:36,241 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,241 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,242 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,242 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,248 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,262 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,263 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,265 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,276 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,287 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 18 proven. 144 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-06 10:26:36,288 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:26:36,288 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [922034319] [2021-05-06 10:26:36,288 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:26:36,288 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1262516249] [2021-05-06 10:26:36,288 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1262516249] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:26:36,288 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:26:36,288 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-05-06 10:26:36,288 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1828938974] [2021-05-06 10:26:36,288 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 10:26:36,288 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:26:36,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 10:26:36,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2021-05-06 10:26:36,289 INFO L87 Difference]: Start difference. First operand 85 states and 86 transitions. Second operand has 14 states, 13 states have (on average 2.769230769230769) internal successors, (36), 13 states have internal predecessors, (36), 11 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 10:26:36,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:26:36,433 INFO L93 Difference]: Finished difference Result 90 states and 92 transitions. [2021-05-06 10:26:36,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 10:26:36,434 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.769230769230769) internal successors, (36), 13 states have internal predecessors, (36), 11 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Word has length 82 [2021-05-06 10:26:36,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:26:36,435 INFO L225 Difference]: With dead ends: 90 [2021-05-06 10:26:36,435 INFO L226 Difference]: Without dead ends: 87 [2021-05-06 10:26:36,435 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 93.9ms TimeCoverageRelationStatistics Valid=33, Invalid=207, Unknown=0, NotChecked=0, Total=240 [2021-05-06 10:26:36,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-06 10:26:36,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2021-05-06 10:26:36,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 63 states have (on average 1.0317460317460319) internal successors, (65), 63 states have internal predecessors, (65), 13 states have call successors, (13), 12 states have call predecessors, (13), 10 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-06 10:26:36,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 89 transitions. [2021-05-06 10:26:36,437 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 89 transitions. Word has length 82 [2021-05-06 10:26:36,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:26:36,437 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 89 transitions. [2021-05-06 10:26:36,437 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 13 states have (on average 2.769230769230769) internal successors, (36), 13 states have internal predecessors, (36), 11 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 10:26:36,438 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 89 transitions. [2021-05-06 10:26:36,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-05-06 10:26:36,438 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:26:36,438 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:26:36,642 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-06 10:26:36,643 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:26:36,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:26:36,643 INFO L82 PathProgramCache]: Analyzing trace with hash -266881524, now seen corresponding path program 9 times [2021-05-06 10:26:36,643 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:26:36,643 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1404403532] [2021-05-06 10:26:36,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:26:36,647 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:26:36,647 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2085931927] [2021-05-06 10:26:36,647 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2021-05-06 10:26:36,752 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-06 10:26:36,752 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 10:26:36,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-06 10:26:36,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:26:36,770 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,771 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,771 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,774 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,775 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,775 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,786 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,800 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,801 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,813 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,814 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,815 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,828 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,830 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,831 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,844 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,845 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,845 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,860 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,861 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,861 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,876 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,877 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,877 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,892 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,893 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,893 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,918 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,919 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:36,930 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 18 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 10:26:36,930 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:26:36,930 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1404403532] [2021-05-06 10:26:36,930 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:26:36,930 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2085931927] [2021-05-06 10:26:36,930 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2085931927] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:26:36,930 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:26:36,930 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-06 10:26:36,930 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1944333668] [2021-05-06 10:26:36,930 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 10:26:36,930 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:26:36,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 10:26:36,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2021-05-06 10:26:36,931 INFO L87 Difference]: Start difference. First operand 87 states and 89 transitions. Second operand has 13 states, 13 states have (on average 4.769230769230769) internal successors, (62), 12 states have internal predecessors, (62), 12 states have call successors, (12), 12 states have call predecessors, (12), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 10:26:37,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:26:37,051 INFO L93 Difference]: Finished difference Result 93 states and 94 transitions. [2021-05-06 10:26:37,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 10:26:37,052 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 4.769230769230769) internal successors, (62), 12 states have internal predecessors, (62), 12 states have call successors, (12), 12 states have call predecessors, (12), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Word has length 84 [2021-05-06 10:26:37,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:26:37,052 INFO L225 Difference]: With dead ends: 93 [2021-05-06 10:26:37,052 INFO L226 Difference]: Without dead ends: 93 [2021-05-06 10:26:37,053 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 105.0ms TimeCoverageRelationStatistics Valid=176, Invalid=286, Unknown=0, NotChecked=0, Total=462 [2021-05-06 10:26:37,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-06 10:26:37,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2021-05-06 10:26:37,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 68 states have (on average 1.0294117647058822) internal successors, (70), 68 states have internal predecessors, (70), 13 states have call successors, (13), 13 states have call predecessors, (13), 11 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-06 10:26:37,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 94 transitions. [2021-05-06 10:26:37,056 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 94 transitions. Word has length 84 [2021-05-06 10:26:37,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:26:37,056 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 94 transitions. [2021-05-06 10:26:37,056 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 4.769230769230769) internal successors, (62), 12 states have internal predecessors, (62), 12 states have call successors, (12), 12 states have call predecessors, (12), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 10:26:37,056 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 94 transitions. [2021-05-06 10:26:37,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-05-06 10:26:37,057 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:26:37,057 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:26:37,261 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:26:37,261 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:26:37,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:26:37,262 INFO L82 PathProgramCache]: Analyzing trace with hash 757893194, now seen corresponding path program 9 times [2021-05-06 10:26:37,262 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:26:37,262 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [5378981] [2021-05-06 10:26:37,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:26:37,266 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:26:37,266 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1873415375] [2021-05-06 10:26:37,266 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2021-05-06 10:26:37,752 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-06 10:26:37,753 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 10:26:37,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 45 conjunts are in the unsatisfiable core [2021-05-06 10:26:37,756 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:26:37,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:37,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:37,804 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:37,805 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:37,823 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:37,823 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:37,842 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:37,843 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:37,860 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:37,860 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:37,878 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:37,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:37,899 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:37,899 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:37,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:37,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:37,940 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:37,941 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:37,941 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:37,942 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:37,948 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:37,961 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:37,962 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:37,964 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:37,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:37,990 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 20 proven. 180 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-05-06 10:26:37,990 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:26:37,990 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [5378981] [2021-05-06 10:26:37,991 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:26:37,991 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1873415375] [2021-05-06 10:26:37,991 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1873415375] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:26:37,991 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:26:37,991 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-05-06 10:26:37,991 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [451958996] [2021-05-06 10:26:37,991 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 10:26:37,991 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:26:37,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 10:26:37,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2021-05-06 10:26:37,991 INFO L87 Difference]: Start difference. First operand 93 states and 94 transitions. Second operand has 15 states, 14 states have (on average 2.7857142857142856) internal successors, (39), 14 states have internal predecessors, (39), 12 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-06 10:26:38,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:26:38,181 INFO L93 Difference]: Finished difference Result 98 states and 100 transitions. [2021-05-06 10:26:38,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 10:26:38,181 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.7857142857142856) internal successors, (39), 14 states have internal predecessors, (39), 12 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) Word has length 90 [2021-05-06 10:26:38,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:26:38,181 INFO L225 Difference]: With dead ends: 98 [2021-05-06 10:26:38,182 INFO L226 Difference]: Without dead ends: 95 [2021-05-06 10:26:38,182 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 133.1ms TimeCoverageRelationStatistics Valid=35, Invalid=237, Unknown=0, NotChecked=0, Total=272 [2021-05-06 10:26:38,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-05-06 10:26:38,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2021-05-06 10:26:38,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 69 states have (on average 1.0289855072463767) internal successors, (71), 69 states have internal predecessors, (71), 14 states have call successors, (14), 13 states have call predecessors, (14), 11 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-06 10:26:38,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 97 transitions. [2021-05-06 10:26:38,184 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 97 transitions. Word has length 90 [2021-05-06 10:26:38,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:26:38,184 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 97 transitions. [2021-05-06 10:26:38,184 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 14 states have (on average 2.7857142857142856) internal successors, (39), 14 states have internal predecessors, (39), 12 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-06 10:26:38,184 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 97 transitions. [2021-05-06 10:26:38,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-05-06 10:26:38,184 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:26:38,184 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:26:38,391 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-05-06 10:26:38,392 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:26:38,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:26:38,392 INFO L82 PathProgramCache]: Analyzing trace with hash -953190739, now seen corresponding path program 10 times [2021-05-06 10:26:38,392 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:26:38,392 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [546023354] [2021-05-06 10:26:38,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:26:38,396 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:26:38,396 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1106824523] [2021-05-06 10:26:38,396 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2021-05-06 10:26:38,851 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 10:26:38,851 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 10:26:38,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-06 10:26:38,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:26:38,860 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:38,862 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:38,862 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:38,865 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:38,866 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:38,866 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:38,876 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:38,877 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:38,877 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:38,889 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:38,890 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:38,890 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:38,903 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:38,904 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:38,905 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:38,919 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:38,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:38,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:38,934 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:38,935 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:38,935 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:38,950 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:38,951 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:38,952 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:38,967 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:38,968 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:38,969 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:38,984 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:38,985 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:38,986 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:39,001 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:39,002 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:39,003 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:39,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:39,020 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:39,030 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 20 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 10:26:39,030 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:26:39,030 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [546023354] [2021-05-06 10:26:39,030 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:26:39,030 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1106824523] [2021-05-06 10:26:39,030 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1106824523] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:26:39,030 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:26:39,030 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-05-06 10:26:39,030 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [53902192] [2021-05-06 10:26:39,031 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 10:26:39,031 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:26:39,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 10:26:39,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2021-05-06 10:26:39,031 INFO L87 Difference]: Start difference. First operand 95 states and 97 transitions. Second operand has 14 states, 14 states have (on average 4.857142857142857) internal successors, (68), 13 states have internal predecessors, (68), 13 states have call successors, (13), 13 states have call predecessors, (13), 11 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-06 10:26:39,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:26:39,183 INFO L93 Difference]: Finished difference Result 101 states and 102 transitions. [2021-05-06 10:26:39,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 10:26:39,183 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.857142857142857) internal successors, (68), 13 states have internal predecessors, (68), 13 states have call successors, (13), 13 states have call predecessors, (13), 11 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) Word has length 92 [2021-05-06 10:26:39,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:26:39,184 INFO L225 Difference]: With dead ends: 101 [2021-05-06 10:26:39,184 INFO L226 Difference]: Without dead ends: 101 [2021-05-06 10:26:39,184 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 141.7ms TimeCoverageRelationStatistics Valid=210, Invalid=342, Unknown=0, NotChecked=0, Total=552 [2021-05-06 10:26:39,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-05-06 10:26:39,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2021-05-06 10:26:39,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 74 states have (on average 1.027027027027027) internal successors, (76), 74 states have internal predecessors, (76), 14 states have call successors, (14), 14 states have call predecessors, (14), 12 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-06 10:26:39,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 102 transitions. [2021-05-06 10:26:39,186 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 102 transitions. Word has length 92 [2021-05-06 10:26:39,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:26:39,186 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 102 transitions. [2021-05-06 10:26:39,186 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 4.857142857142857) internal successors, (68), 13 states have internal predecessors, (68), 13 states have call successors, (13), 13 states have call predecessors, (13), 11 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-06 10:26:39,186 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 102 transitions. [2021-05-06 10:26:39,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-05-06 10:26:39,187 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:26:39,187 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:26:39,391 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:26:39,391 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:26:39,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:26:39,392 INFO L82 PathProgramCache]: Analyzing trace with hash 138382379, now seen corresponding path program 10 times [2021-05-06 10:26:39,392 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:26:39,392 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1972399699] [2021-05-06 10:26:39,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:26:39,396 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:26:39,396 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1508879423] [2021-05-06 10:26:39,396 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2021-05-06 10:26:40,208 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 10:26:40,208 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 10:26:40,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 48 conjunts are in the unsatisfiable core [2021-05-06 10:26:40,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:26:40,384 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:40,384 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:40,385 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:40,385 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:40,391 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:40,405 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:40,406 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:40,408 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:40,422 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:40,436 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 22 proven. 220 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-05-06 10:26:40,436 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:26:40,436 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1972399699] [2021-05-06 10:26:40,436 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:26:40,436 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1508879423] [2021-05-06 10:26:40,436 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1508879423] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:26:40,437 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:26:40,437 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-05-06 10:26:40,437 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729909602] [2021-05-06 10:26:40,437 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 10:26:40,437 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:26:40,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 10:26:40,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2021-05-06 10:26:40,438 INFO L87 Difference]: Start difference. First operand 101 states and 102 transitions. Second operand has 16 states, 15 states have (on average 2.8) internal successors, (42), 15 states have internal predecessors, (42), 13 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-06 10:26:40,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:26:40,657 INFO L93 Difference]: Finished difference Result 106 states and 108 transitions. [2021-05-06 10:26:40,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 10:26:40,657 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.8) internal successors, (42), 15 states have internal predecessors, (42), 13 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Word has length 98 [2021-05-06 10:26:40,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:26:40,660 INFO L225 Difference]: With dead ends: 106 [2021-05-06 10:26:40,660 INFO L226 Difference]: Without dead ends: 103 [2021-05-06 10:26:40,660 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 122.7ms TimeCoverageRelationStatistics Valid=37, Invalid=269, Unknown=0, NotChecked=0, Total=306 [2021-05-06 10:26:40,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-05-06 10:26:40,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-05-06 10:26:40,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 75 states have (on average 1.0266666666666666) internal successors, (77), 75 states have internal predecessors, (77), 15 states have call successors, (15), 14 states have call predecessors, (15), 12 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-06 10:26:40,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 105 transitions. [2021-05-06 10:26:40,663 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 105 transitions. Word has length 98 [2021-05-06 10:26:40,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:26:40,663 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 105 transitions. [2021-05-06 10:26:40,663 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 15 states have (on average 2.8) internal successors, (42), 15 states have internal predecessors, (42), 13 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-06 10:26:40,663 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 105 transitions. [2021-05-06 10:26:40,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-05-06 10:26:40,663 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:26:40,663 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:26:40,869 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-06 10:26:40,869 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:26:40,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:26:40,869 INFO L82 PathProgramCache]: Analyzing trace with hash 697370190, now seen corresponding path program 11 times [2021-05-06 10:26:40,869 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:26:40,869 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1900066863] [2021-05-06 10:26:40,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:26:40,877 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:26:40,877 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [167888401] [2021-05-06 10:26:40,877 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2021-05-06 10:26:41,272 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-05-06 10:26:41,272 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 10:26:41,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 336 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-06 10:26:41,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:26:41,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,285 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,297 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,298 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,299 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,310 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,311 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,311 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,323 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,324 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,324 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,338 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,340 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,340 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,353 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,354 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,354 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,368 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,369 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,369 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,385 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,387 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,387 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,402 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,403 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,403 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,422 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,423 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,423 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,441 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,442 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,442 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,458 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:41,469 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 22 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 10:26:41,469 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:26:41,469 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1900066863] [2021-05-06 10:26:41,469 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:26:41,469 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [167888401] [2021-05-06 10:26:41,469 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [167888401] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:26:41,470 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:26:41,470 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-05-06 10:26:41,470 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759813967] [2021-05-06 10:26:41,470 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 10:26:41,470 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:26:41,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 10:26:41,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2021-05-06 10:26:41,470 INFO L87 Difference]: Start difference. First operand 103 states and 105 transitions. Second operand has 15 states, 15 states have (on average 4.933333333333334) internal successors, (74), 14 states have internal predecessors, (74), 14 states have call successors, (14), 14 states have call predecessors, (14), 12 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-06 10:26:41,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:26:41,604 INFO L93 Difference]: Finished difference Result 109 states and 110 transitions. [2021-05-06 10:26:41,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 10:26:41,604 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 4.933333333333334) internal successors, (74), 14 states have internal predecessors, (74), 14 states have call successors, (14), 14 states have call predecessors, (14), 12 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Word has length 100 [2021-05-06 10:26:41,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:26:41,605 INFO L225 Difference]: With dead ends: 109 [2021-05-06 10:26:41,605 INFO L226 Difference]: Without dead ends: 109 [2021-05-06 10:26:41,605 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 139.9ms TimeCoverageRelationStatistics Valid=247, Invalid=403, Unknown=0, NotChecked=0, Total=650 [2021-05-06 10:26:41,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-05-06 10:26:41,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2021-05-06 10:26:41,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 80 states have (on average 1.025) internal successors, (82), 80 states have internal predecessors, (82), 15 states have call successors, (15), 15 states have call predecessors, (15), 13 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-06 10:26:41,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 110 transitions. [2021-05-06 10:26:41,607 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 110 transitions. Word has length 100 [2021-05-06 10:26:41,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:26:41,607 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 110 transitions. [2021-05-06 10:26:41,607 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 4.933333333333334) internal successors, (74), 14 states have internal predecessors, (74), 14 states have call successors, (14), 14 states have call predecessors, (14), 12 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-06 10:26:41,607 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 110 transitions. [2021-05-06 10:26:41,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-05-06 10:26:41,608 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:26:41,608 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:26:41,813 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-06 10:26:41,813 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:26:41,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:26:41,822 INFO L82 PathProgramCache]: Analyzing trace with hash 1036328716, now seen corresponding path program 11 times [2021-05-06 10:26:41,822 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:26:41,822 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [961777568] [2021-05-06 10:26:41,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:26:41,826 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:26:41,826 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1147493415] [2021-05-06 10:26:41,826 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2021-05-06 10:26:42,222 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-05-06 10:26:42,222 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 10:26:42,223 INFO L263 TraceCheckSpWp]: Trace formula consists of 346 conjuncts, 52 conjunts are in the unsatisfiable core [2021-05-06 10:26:42,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:26:42,428 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:42,428 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:42,429 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:42,429 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:42,437 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:42,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:42,455 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:42,457 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:42,471 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:42,486 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 24 proven. 264 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2021-05-06 10:26:42,486 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:26:42,486 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [961777568] [2021-05-06 10:26:42,486 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:26:42,486 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1147493415] [2021-05-06 10:26:42,486 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1147493415] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:26:42,486 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:26:42,486 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2021-05-06 10:26:42,486 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [675763243] [2021-05-06 10:26:42,487 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 10:26:42,487 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:26:42,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 10:26:42,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2021-05-06 10:26:42,487 INFO L87 Difference]: Start difference. First operand 109 states and 110 transitions. Second operand has 17 states, 16 states have (on average 2.8125) internal successors, (45), 16 states have internal predecessors, (45), 14 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-06 10:26:42,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:26:42,714 INFO L93 Difference]: Finished difference Result 114 states and 116 transitions. [2021-05-06 10:26:42,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 10:26:42,715 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.8125) internal successors, (45), 16 states have internal predecessors, (45), 14 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) Word has length 106 [2021-05-06 10:26:42,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:26:42,715 INFO L225 Difference]: With dead ends: 114 [2021-05-06 10:26:42,715 INFO L226 Difference]: Without dead ends: 111 [2021-05-06 10:26:42,715 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 146.4ms TimeCoverageRelationStatistics Valid=39, Invalid=303, Unknown=0, NotChecked=0, Total=342 [2021-05-06 10:26:42,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-05-06 10:26:42,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2021-05-06 10:26:42,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 81 states have (on average 1.0246913580246915) internal successors, (83), 81 states have internal predecessors, (83), 16 states have call successors, (16), 15 states have call predecessors, (16), 13 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-06 10:26:42,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 113 transitions. [2021-05-06 10:26:42,718 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 113 transitions. Word has length 106 [2021-05-06 10:26:42,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:26:42,718 INFO L480 AbstractCegarLoop]: Abstraction has 111 states and 113 transitions. [2021-05-06 10:26:42,718 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 16 states have (on average 2.8125) internal successors, (45), 16 states have internal predecessors, (45), 14 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-06 10:26:42,718 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 113 transitions. [2021-05-06 10:26:42,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-05-06 10:26:42,718 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:26:42,718 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:26:42,918 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-05-06 10:26:42,919 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:26:42,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:26:42,919 INFO L82 PathProgramCache]: Analyzing trace with hash 335373551, now seen corresponding path program 12 times [2021-05-06 10:26:42,919 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:26:42,919 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [177243729] [2021-05-06 10:26:42,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:26:42,923 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:26:42,923 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1529327965] [2021-05-06 10:26:42,923 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2021-05-06 10:26:43,098 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-05-06 10:26:43,098 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 10:26:43,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-06 10:26:43,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:26:43,107 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,107 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,108 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,110 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,111 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,112 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,122 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,123 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,123 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,134 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,135 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,135 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,147 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,148 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,148 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,161 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,162 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,162 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,177 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,178 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,179 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,193 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,194 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,195 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,209 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,210 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,210 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,224 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,225 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,225 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,241 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,241 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,242 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,257 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,258 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,259 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,275 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,276 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,277 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,294 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,295 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:43,306 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 24 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 10:26:43,306 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:26:43,306 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [177243729] [2021-05-06 10:26:43,306 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:26:43,306 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1529327965] [2021-05-06 10:26:43,306 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1529327965] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:26:43,306 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:26:43,306 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-05-06 10:26:43,306 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [30487213] [2021-05-06 10:26:43,306 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 10:26:43,306 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:26:43,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 10:26:43,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2021-05-06 10:26:43,307 INFO L87 Difference]: Start difference. First operand 111 states and 113 transitions. Second operand has 16 states, 16 states have (on average 5.0) internal successors, (80), 15 states have internal predecessors, (80), 15 states have call successors, (15), 15 states have call predecessors, (15), 13 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-06 10:26:43,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:26:43,461 INFO L93 Difference]: Finished difference Result 117 states and 118 transitions. [2021-05-06 10:26:43,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 10:26:43,461 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 5.0) internal successors, (80), 15 states have internal predecessors, (80), 15 states have call successors, (15), 15 states have call predecessors, (15), 13 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) Word has length 108 [2021-05-06 10:26:43,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:26:43,462 INFO L225 Difference]: With dead ends: 117 [2021-05-06 10:26:43,462 INFO L226 Difference]: Without dead ends: 117 [2021-05-06 10:26:43,462 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 164.5ms TimeCoverageRelationStatistics Valid=287, Invalid=469, Unknown=0, NotChecked=0, Total=756 [2021-05-06 10:26:43,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-05-06 10:26:43,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2021-05-06 10:26:43,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 86 states have (on average 1.0232558139534884) internal successors, (88), 86 states have internal predecessors, (88), 16 states have call successors, (16), 16 states have call predecessors, (16), 14 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-06 10:26:43,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 118 transitions. [2021-05-06 10:26:43,464 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 118 transitions. Word has length 108 [2021-05-06 10:26:43,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:26:43,464 INFO L480 AbstractCegarLoop]: Abstraction has 117 states and 118 transitions. [2021-05-06 10:26:43,464 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 5.0) internal successors, (80), 15 states have internal predecessors, (80), 15 states have call successors, (15), 15 states have call predecessors, (15), 13 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-06 10:26:43,464 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 118 transitions. [2021-05-06 10:26:43,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-05-06 10:26:43,465 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:26:43,465 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:26:43,669 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-05-06 10:26:43,669 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:26:43,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:26:43,669 INFO L82 PathProgramCache]: Analyzing trace with hash 1975402733, now seen corresponding path program 12 times [2021-05-06 10:26:43,670 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:26:43,670 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [779802252] [2021-05-06 10:26:43,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:26:43,673 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:26:43,673 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [322582325] [2021-05-06 10:26:43,673 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2021-05-06 10:26:44,404 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-05-06 10:26:44,404 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 10:26:44,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 367 conjuncts, 57 conjunts are in the unsatisfiable core [2021-05-06 10:26:44,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:26:44,493 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:44,493 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:44,514 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:44,515 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:44,536 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:44,536 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:44,555 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:44,556 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:44,576 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:44,576 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:44,596 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:44,597 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:44,617 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:44,618 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:44,639 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:44,640 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:44,640 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:44,641 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:44,647 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:44,661 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:44,662 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:44,664 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:44,678 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:44,692 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 26 proven. 312 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2021-05-06 10:26:44,692 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:26:44,692 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [779802252] [2021-05-06 10:26:44,692 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:26:44,692 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [322582325] [2021-05-06 10:26:44,692 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [322582325] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:26:44,692 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:26:44,692 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2021-05-06 10:26:44,692 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1604398440] [2021-05-06 10:26:44,693 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 10:26:44,693 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:26:44,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 10:26:44,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2021-05-06 10:26:44,693 INFO L87 Difference]: Start difference. First operand 117 states and 118 transitions. Second operand has 18 states, 17 states have (on average 2.823529411764706) internal successors, (48), 17 states have internal predecessors, (48), 15 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-06 10:26:44,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:26:44,967 INFO L93 Difference]: Finished difference Result 122 states and 124 transitions. [2021-05-06 10:26:44,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 10:26:44,968 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.823529411764706) internal successors, (48), 17 states have internal predecessors, (48), 15 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) Word has length 114 [2021-05-06 10:26:44,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:26:44,968 INFO L225 Difference]: With dead ends: 122 [2021-05-06 10:26:44,968 INFO L226 Difference]: Without dead ends: 119 [2021-05-06 10:26:44,968 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 157.4ms TimeCoverageRelationStatistics Valid=41, Invalid=339, Unknown=0, NotChecked=0, Total=380 [2021-05-06 10:26:44,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-05-06 10:26:44,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2021-05-06 10:26:44,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 87 states have (on average 1.0229885057471264) internal successors, (89), 87 states have internal predecessors, (89), 17 states have call successors, (17), 16 states have call predecessors, (17), 14 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-05-06 10:26:44,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 121 transitions. [2021-05-06 10:26:44,971 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 121 transitions. Word has length 114 [2021-05-06 10:26:44,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:26:44,971 INFO L480 AbstractCegarLoop]: Abstraction has 119 states and 121 transitions. [2021-05-06 10:26:44,971 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 17 states have (on average 2.823529411764706) internal successors, (48), 17 states have internal predecessors, (48), 15 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-06 10:26:44,971 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 121 transitions. [2021-05-06 10:26:44,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-05-06 10:26:44,971 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:26:44,971 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:26:45,172 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2021-05-06 10:26:45,173 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:26:45,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:26:45,173 INFO L82 PathProgramCache]: Analyzing trace with hash 842371728, now seen corresponding path program 13 times [2021-05-06 10:26:45,173 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:26:45,173 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1084260465] [2021-05-06 10:26:45,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:26:45,177 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:26:45,177 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [273686889] [2021-05-06 10:26:45,177 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2021-05-06 10:26:45,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 10:26:45,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 378 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-06 10:26:45,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:26:45,246 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,247 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,248 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,250 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,252 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,253 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,263 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,264 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,264 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,275 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,276 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,276 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,288 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,289 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,289 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,302 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,302 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,303 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,316 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,317 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,317 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,330 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,331 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,332 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,347 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,347 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,362 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,380 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,381 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,382 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,398 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,399 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,399 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,416 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,417 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,417 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,435 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,455 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:45,468 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 26 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 10:26:45,468 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:26:45,468 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1084260465] [2021-05-06 10:26:45,468 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:26:45,468 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [273686889] [2021-05-06 10:26:45,468 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [273686889] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:26:45,468 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:26:45,468 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2021-05-06 10:26:45,468 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1872645969] [2021-05-06 10:26:45,469 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 10:26:45,469 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:26:45,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 10:26:45,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2021-05-06 10:26:45,469 INFO L87 Difference]: Start difference. First operand 119 states and 121 transitions. Second operand has 17 states, 17 states have (on average 5.0588235294117645) internal successors, (86), 16 states have internal predecessors, (86), 16 states have call successors, (16), 16 states have call predecessors, (16), 14 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-06 10:26:45,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:26:45,640 INFO L93 Difference]: Finished difference Result 125 states and 126 transitions. [2021-05-06 10:26:45,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 10:26:45,640 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 5.0588235294117645) internal successors, (86), 16 states have internal predecessors, (86), 16 states have call successors, (16), 16 states have call predecessors, (16), 14 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) Word has length 116 [2021-05-06 10:26:45,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:26:45,641 INFO L225 Difference]: With dead ends: 125 [2021-05-06 10:26:45,641 INFO L226 Difference]: Without dead ends: 125 [2021-05-06 10:26:45,641 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 188.0ms TimeCoverageRelationStatistics Valid=330, Invalid=540, Unknown=0, NotChecked=0, Total=870 [2021-05-06 10:26:45,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-05-06 10:26:45,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 125. [2021-05-06 10:26:45,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 92 states have (on average 1.0217391304347827) internal successors, (94), 92 states have internal predecessors, (94), 17 states have call successors, (17), 17 states have call predecessors, (17), 15 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-05-06 10:26:45,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 126 transitions. [2021-05-06 10:26:45,643 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 126 transitions. Word has length 116 [2021-05-06 10:26:45,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:26:45,644 INFO L480 AbstractCegarLoop]: Abstraction has 125 states and 126 transitions. [2021-05-06 10:26:45,644 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 5.0588235294117645) internal successors, (86), 16 states have internal predecessors, (86), 16 states have call successors, (16), 16 states have call predecessors, (16), 14 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-06 10:26:45,644 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 126 transitions. [2021-05-06 10:26:45,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-05-06 10:26:45,644 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:26:45,644 INFO L523 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:26:45,856 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 10:26:45,857 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:26:45,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:26:45,857 INFO L82 PathProgramCache]: Analyzing trace with hash -953421362, now seen corresponding path program 13 times [2021-05-06 10:26:45,857 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:26:45,857 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2131115264] [2021-05-06 10:26:45,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:26:45,861 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:26:45,861 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [496681391] [2021-05-06 10:26:45,861 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2021-05-06 10:26:46,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 10:26:46,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 388 conjuncts, 60 conjunts are in the unsatisfiable core [2021-05-06 10:26:46,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:26:46,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:46,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:46,650 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:46,650 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:46,657 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:46,673 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:46,674 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:46,676 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:46,690 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:46,704 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 28 proven. 364 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2021-05-06 10:26:46,705 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:26:46,705 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2131115264] [2021-05-06 10:26:46,705 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:26:46,705 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [496681391] [2021-05-06 10:26:46,705 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [496681391] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:26:46,705 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:26:46,705 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2021-05-06 10:26:46,705 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272980384] [2021-05-06 10:26:46,705 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 10:26:46,705 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:26:46,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 10:26:46,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2021-05-06 10:26:46,706 INFO L87 Difference]: Start difference. First operand 125 states and 126 transitions. Second operand has 19 states, 18 states have (on average 2.8333333333333335) internal successors, (51), 18 states have internal predecessors, (51), 16 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-05-06 10:26:46,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:26:46,983 INFO L93 Difference]: Finished difference Result 130 states and 132 transitions. [2021-05-06 10:26:46,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 10:26:46,984 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.8333333333333335) internal successors, (51), 18 states have internal predecessors, (51), 16 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) Word has length 122 [2021-05-06 10:26:46,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:26:46,984 INFO L225 Difference]: With dead ends: 130 [2021-05-06 10:26:46,984 INFO L226 Difference]: Without dead ends: 127 [2021-05-06 10:26:46,984 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 169.7ms TimeCoverageRelationStatistics Valid=43, Invalid=377, Unknown=0, NotChecked=0, Total=420 [2021-05-06 10:26:46,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-05-06 10:26:46,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2021-05-06 10:26:46,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 93 states have (on average 1.021505376344086) internal successors, (95), 93 states have internal predecessors, (95), 18 states have call successors, (18), 17 states have call predecessors, (18), 15 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-06 10:26:46,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 129 transitions. [2021-05-06 10:26:46,987 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 129 transitions. Word has length 122 [2021-05-06 10:26:46,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:26:46,987 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 129 transitions. [2021-05-06 10:26:46,987 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 18 states have (on average 2.8333333333333335) internal successors, (51), 18 states have internal predecessors, (51), 16 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-05-06 10:26:46,987 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 129 transitions. [2021-05-06 10:26:46,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-05-06 10:26:46,987 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:26:46,988 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:26:47,192 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2021-05-06 10:26:47,192 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:26:47,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:26:47,193 INFO L82 PathProgramCache]: Analyzing trace with hash -554004687, now seen corresponding path program 14 times [2021-05-06 10:26:47,193 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:26:47,193 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [212036224] [2021-05-06 10:26:47,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:26:47,197 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:26:47,197 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [885050991] [2021-05-06 10:26:47,197 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2021-05-06 10:26:47,266 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 10:26:47,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 10:26:47,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 399 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-06 10:26:47,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:26:47,276 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,277 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,277 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,279 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,280 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,280 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,302 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,303 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,304 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,315 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,316 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,316 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,328 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,329 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,329 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,342 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,343 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,343 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,356 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,357 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,357 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,379 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,380 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,380 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,395 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,395 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,396 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,415 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,416 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,416 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,434 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,435 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,435 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,471 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,472 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,473 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,490 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,491 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,492 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,510 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,511 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:47,523 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 28 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 10:26:47,523 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:26:47,523 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [212036224] [2021-05-06 10:26:47,523 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:26:47,523 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [885050991] [2021-05-06 10:26:47,523 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [885050991] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:26:47,523 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:26:47,523 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2021-05-06 10:26:47,523 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779842044] [2021-05-06 10:26:47,523 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 10:26:47,523 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:26:47,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 10:26:47,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2021-05-06 10:26:47,524 INFO L87 Difference]: Start difference. First operand 127 states and 129 transitions. Second operand has 18 states, 18 states have (on average 5.111111111111111) internal successors, (92), 17 states have internal predecessors, (92), 17 states have call successors, (17), 17 states have call predecessors, (17), 15 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-05-06 10:26:47,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:26:47,708 INFO L93 Difference]: Finished difference Result 133 states and 134 transitions. [2021-05-06 10:26:47,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 10:26:47,708 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 5.111111111111111) internal successors, (92), 17 states have internal predecessors, (92), 17 states have call successors, (17), 17 states have call predecessors, (17), 15 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) Word has length 124 [2021-05-06 10:26:47,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:26:47,709 INFO L225 Difference]: With dead ends: 133 [2021-05-06 10:26:47,709 INFO L226 Difference]: Without dead ends: 133 [2021-05-06 10:26:47,709 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 204.3ms TimeCoverageRelationStatistics Valid=376, Invalid=616, Unknown=0, NotChecked=0, Total=992 [2021-05-06 10:26:47,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-05-06 10:26:47,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2021-05-06 10:26:47,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 98 states have (on average 1.0204081632653061) internal successors, (100), 98 states have internal predecessors, (100), 18 states have call successors, (18), 18 states have call predecessors, (18), 16 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-06 10:26:47,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 134 transitions. [2021-05-06 10:26:47,711 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 134 transitions. Word has length 124 [2021-05-06 10:26:47,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:26:47,712 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 134 transitions. [2021-05-06 10:26:47,712 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 5.111111111111111) internal successors, (92), 17 states have internal predecessors, (92), 17 states have call successors, (17), 17 states have call predecessors, (17), 15 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-05-06 10:26:47,712 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 134 transitions. [2021-05-06 10:26:47,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-05-06 10:26:47,712 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:26:47,712 INFO L523 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:26:47,920 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-05-06 10:26:47,921 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:26:47,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:26:47,921 INFO L82 PathProgramCache]: Analyzing trace with hash -1206963793, now seen corresponding path program 14 times [2021-05-06 10:26:47,921 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:26:47,921 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [452750147] [2021-05-06 10:26:47,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:26:47,925 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:26:47,925 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1777238341] [2021-05-06 10:26:47,925 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2021-05-06 10:26:48,561 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 10:26:48,561 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 10:26:48,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 409 conjuncts, 64 conjunts are in the unsatisfiable core [2021-05-06 10:26:48,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:26:48,836 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:48,836 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:48,837 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:48,838 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:48,844 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:48,859 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:48,860 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:48,863 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:48,877 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:48,892 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 30 proven. 420 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2021-05-06 10:26:48,892 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:26:48,892 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [452750147] [2021-05-06 10:26:48,892 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:26:48,892 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1777238341] [2021-05-06 10:26:48,892 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1777238341] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:26:48,892 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:26:48,892 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2021-05-06 10:26:48,893 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [137976909] [2021-05-06 10:26:48,893 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 10:26:48,893 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:26:48,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 10:26:48,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2021-05-06 10:26:48,893 INFO L87 Difference]: Start difference. First operand 133 states and 134 transitions. Second operand has 20 states, 19 states have (on average 2.8421052631578947) internal successors, (54), 19 states have internal predecessors, (54), 17 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-06 10:26:49,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:26:49,191 INFO L93 Difference]: Finished difference Result 138 states and 140 transitions. [2021-05-06 10:26:49,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 10:26:49,192 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 2.8421052631578947) internal successors, (54), 19 states have internal predecessors, (54), 17 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) Word has length 130 [2021-05-06 10:26:49,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:26:49,192 INFO L225 Difference]: With dead ends: 138 [2021-05-06 10:26:49,192 INFO L226 Difference]: Without dead ends: 135 [2021-05-06 10:26:49,192 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 183.5ms TimeCoverageRelationStatistics Valid=45, Invalid=417, Unknown=0, NotChecked=0, Total=462 [2021-05-06 10:26:49,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-05-06 10:26:49,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 135. [2021-05-06 10:26:49,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 99 states have (on average 1.02020202020202) internal successors, (101), 99 states have internal predecessors, (101), 19 states have call successors, (19), 18 states have call predecessors, (19), 16 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2021-05-06 10:26:49,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 137 transitions. [2021-05-06 10:26:49,195 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 137 transitions. Word has length 130 [2021-05-06 10:26:49,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:26:49,195 INFO L480 AbstractCegarLoop]: Abstraction has 135 states and 137 transitions. [2021-05-06 10:26:49,195 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 19 states have (on average 2.8421052631578947) internal successors, (54), 19 states have internal predecessors, (54), 17 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-06 10:26:49,195 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 137 transitions. [2021-05-06 10:26:49,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-05-06 10:26:49,196 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:26:49,196 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:26:49,400 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-05-06 10:26:49,401 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:26:49,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:26:49,401 INFO L82 PathProgramCache]: Analyzing trace with hash 604854994, now seen corresponding path program 15 times [2021-05-06 10:26:49,401 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:26:49,401 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [411106269] [2021-05-06 10:26:49,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:26:49,413 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:26:49,413 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1899239707] [2021-05-06 10:26:49,413 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2021-05-06 10:26:50,041 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-05-06 10:26:50,041 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 10:26:50,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 420 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-06 10:26:50,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:26:50,058 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,059 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,059 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,062 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,063 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,063 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,073 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,074 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,074 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,085 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,086 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,088 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,099 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,100 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,100 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,112 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,113 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,113 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,126 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,127 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,127 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,141 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,141 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,142 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,156 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,156 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,157 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,171 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,172 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,172 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,187 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,188 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,188 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,208 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,209 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,209 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,227 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,228 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,228 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,246 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,247 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,247 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,264 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,265 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,265 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,283 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,284 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,284 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,304 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,304 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:50,316 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 30 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 10:26:50,316 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:26:50,316 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [411106269] [2021-05-06 10:26:50,316 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:26:50,316 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1899239707] [2021-05-06 10:26:50,316 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1899239707] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:26:50,316 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:26:50,316 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2021-05-06 10:26:50,317 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [766635945] [2021-05-06 10:26:50,317 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 10:26:50,317 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:26:50,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 10:26:50,317 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2021-05-06 10:26:50,317 INFO L87 Difference]: Start difference. First operand 135 states and 137 transitions. Second operand has 19 states, 19 states have (on average 5.157894736842105) internal successors, (98), 18 states have internal predecessors, (98), 18 states have call successors, (18), 18 states have call predecessors, (18), 16 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-06 10:26:50,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:26:50,539 INFO L93 Difference]: Finished difference Result 141 states and 142 transitions. [2021-05-06 10:26:50,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 10:26:50,540 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 5.157894736842105) internal successors, (98), 18 states have internal predecessors, (98), 18 states have call successors, (18), 18 states have call predecessors, (18), 16 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) Word has length 132 [2021-05-06 10:26:50,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:26:50,540 INFO L225 Difference]: With dead ends: 141 [2021-05-06 10:26:50,540 INFO L226 Difference]: Without dead ends: 141 [2021-05-06 10:26:50,540 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 248.5ms TimeCoverageRelationStatistics Valid=425, Invalid=697, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 10:26:50,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-05-06 10:26:50,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 141. [2021-05-06 10:26:50,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 104 states have (on average 1.0192307692307692) internal successors, (106), 104 states have internal predecessors, (106), 19 states have call successors, (19), 19 states have call predecessors, (19), 17 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2021-05-06 10:26:50,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 142 transitions. [2021-05-06 10:26:50,543 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 142 transitions. Word has length 132 [2021-05-06 10:26:50,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:26:50,543 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 142 transitions. [2021-05-06 10:26:50,543 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 5.157894736842105) internal successors, (98), 18 states have internal predecessors, (98), 18 states have call successors, (18), 18 states have call predecessors, (18), 16 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-06 10:26:50,543 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 142 transitions. [2021-05-06 10:26:50,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-05-06 10:26:50,543 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:26:50,544 INFO L523 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:26:50,748 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-05-06 10:26:50,749 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:26:50,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:26:50,749 INFO L82 PathProgramCache]: Analyzing trace with hash 1030291600, now seen corresponding path program 15 times [2021-05-06 10:26:50,749 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:26:50,749 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1743894018] [2021-05-06 10:26:50,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:26:50,753 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:26:50,753 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [544784802] [2021-05-06 10:26:50,753 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2021-05-06 10:26:51,494 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-05-06 10:26:51,495 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 10:26:51,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 430 conjuncts, 76 conjunts are in the unsatisfiable core [2021-05-06 10:26:51,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:26:51,522 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,523 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,537 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,538 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,552 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,553 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,568 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,569 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,585 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,586 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,605 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,606 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,626 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,626 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,645 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,645 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,664 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,665 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,689 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,689 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,714 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,715 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,736 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,737 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,761 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,762 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,785 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,786 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,810 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,810 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,811 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,811 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,848 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,886 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,913 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,914 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,918 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,934 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:51,951 INFO L134 CoverageAnalysis]: Checked inductivity of 992 backedges. 76 proven. 481 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2021-05-06 10:26:51,951 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:26:51,951 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1743894018] [2021-05-06 10:26:51,952 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:26:51,952 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [544784802] [2021-05-06 10:26:51,952 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [544784802] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:26:51,952 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:26:51,952 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2021-05-06 10:26:51,952 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [740314314] [2021-05-06 10:26:51,952 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 10:26:51,952 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:26:51,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 10:26:51,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=462, Unknown=0, NotChecked=0, Total=506 [2021-05-06 10:26:51,953 INFO L87 Difference]: Start difference. First operand 141 states and 142 transitions. Second operand has 23 states, 22 states have (on average 2.727272727272727) internal successors, (60), 22 states have internal predecessors, (60), 18 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2021-05-06 10:26:52,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:26:52,428 INFO L93 Difference]: Finished difference Result 146 states and 148 transitions. [2021-05-06 10:26:52,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 10:26:52,429 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 2.727272727272727) internal successors, (60), 22 states have internal predecessors, (60), 18 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) Word has length 138 [2021-05-06 10:26:52,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:26:52,429 INFO L225 Difference]: With dead ends: 146 [2021-05-06 10:26:52,429 INFO L226 Difference]: Without dead ends: 143 [2021-05-06 10:26:52,429 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 115 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 297.8ms TimeCoverageRelationStatistics Valid=59, Invalid=591, Unknown=0, NotChecked=0, Total=650 [2021-05-06 10:26:52,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-05-06 10:26:52,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 143. [2021-05-06 10:26:52,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 105 states have (on average 1.019047619047619) internal successors, (107), 105 states have internal predecessors, (107), 20 states have call successors, (20), 19 states have call predecessors, (20), 17 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-06 10:26:52,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 145 transitions. [2021-05-06 10:26:52,432 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 145 transitions. Word has length 138 [2021-05-06 10:26:52,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:26:52,432 INFO L480 AbstractCegarLoop]: Abstraction has 143 states and 145 transitions. [2021-05-06 10:26:52,432 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 22 states have (on average 2.727272727272727) internal successors, (60), 22 states have internal predecessors, (60), 18 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2021-05-06 10:26:52,432 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 145 transitions. [2021-05-06 10:26:52,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-05-06 10:26:52,433 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:26:52,433 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:26:52,639 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-05-06 10:26:52,639 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:26:52,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:26:52,640 INFO L82 PathProgramCache]: Analyzing trace with hash -1171327629, now seen corresponding path program 16 times [2021-05-06 10:26:52,640 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:26:52,640 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [583925437] [2021-05-06 10:26:52,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:26:52,644 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:26:52,644 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [248124254] [2021-05-06 10:26:52,644 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2021-05-06 10:26:53,564 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 10:26:53,565 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 10:26:53,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 441 conjuncts, 37 conjunts are in the unsatisfiable core [2021-05-06 10:26:53,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:26:53,577 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,578 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,578 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,585 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,586 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,586 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,596 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,597 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,598 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,609 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,610 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,610 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,622 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,622 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,623 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,635 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,636 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,636 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,650 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,651 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,651 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,665 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,665 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,666 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,680 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,680 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,681 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,695 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,696 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,696 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,712 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,713 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,714 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,730 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,731 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,731 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,748 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,748 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,749 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,765 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,766 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,766 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,792 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,793 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,793 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,815 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,816 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,816 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,841 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,842 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,842 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,865 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,866 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:53,879 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 32 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 10:26:53,879 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:26:53,880 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [583925437] [2021-05-06 10:26:53,880 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:26:53,880 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [248124254] [2021-05-06 10:26:53,880 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [248124254] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:26:53,880 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:26:53,881 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2021-05-06 10:26:53,881 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [284002901] [2021-05-06 10:26:53,881 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 10:26:53,881 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:26:53,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 10:26:53,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2021-05-06 10:26:53,882 INFO L87 Difference]: Start difference. First operand 143 states and 145 transitions. Second operand has 20 states, 20 states have (on average 5.2) internal successors, (104), 19 states have internal predecessors, (104), 19 states have call successors, (19), 19 states have call predecessors, (19), 17 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2021-05-06 10:26:54,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:26:54,149 INFO L93 Difference]: Finished difference Result 149 states and 150 transitions. [2021-05-06 10:26:54,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-06 10:26:54,150 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 5.2) internal successors, (104), 19 states have internal predecessors, (104), 19 states have call successors, (19), 19 states have call predecessors, (19), 17 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) Word has length 140 [2021-05-06 10:26:54,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:26:54,150 INFO L225 Difference]: With dead ends: 149 [2021-05-06 10:26:54,150 INFO L226 Difference]: Without dead ends: 149 [2021-05-06 10:26:54,151 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 287.4ms TimeCoverageRelationStatistics Valid=477, Invalid=783, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 10:26:54,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-05-06 10:26:54,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 149. [2021-05-06 10:26:54,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 110 states have (on average 1.018181818181818) internal successors, (112), 110 states have internal predecessors, (112), 20 states have call successors, (20), 20 states have call predecessors, (20), 18 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-06 10:26:54,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 150 transitions. [2021-05-06 10:26:54,154 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 150 transitions. Word has length 140 [2021-05-06 10:26:54,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:26:54,154 INFO L480 AbstractCegarLoop]: Abstraction has 149 states and 150 transitions. [2021-05-06 10:26:54,154 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 5.2) internal successors, (104), 19 states have internal predecessors, (104), 19 states have call successors, (19), 19 states have call predecessors, (19), 17 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2021-05-06 10:26:54,154 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 150 transitions. [2021-05-06 10:26:54,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-05-06 10:26:54,155 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:26:54,155 INFO L523 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:26:54,360 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable51 [2021-05-06 10:26:54,360 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:26:54,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:26:54,360 INFO L82 PathProgramCache]: Analyzing trace with hash -1153802639, now seen corresponding path program 16 times [2021-05-06 10:26:54,360 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:26:54,360 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1024863352] [2021-05-06 10:26:54,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:26:54,366 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:26:54,366 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1638663335] [2021-05-06 10:26:54,366 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2021-05-06 10:26:55,121 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 10:26:55,121 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 10:26:55,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 451 conjuncts, 72 conjunts are in the unsatisfiable core [2021-05-06 10:26:55,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 10:26:55,424 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:55,424 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:55,425 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:55,425 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:55,431 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:55,462 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:55,462 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:55,465 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:55,481 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 10:26:55,498 INFO L134 CoverageAnalysis]: Checked inductivity of 1122 backedges. 34 proven. 544 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2021-05-06 10:26:55,498 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 10:26:55,498 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1024863352] [2021-05-06 10:26:55,498 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 10:26:55,498 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1638663335] [2021-05-06 10:26:55,498 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1638663335] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 10:26:55,498 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 10:26:55,498 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2021-05-06 10:26:55,498 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1775963104] [2021-05-06 10:26:55,499 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 10:26:55,499 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 10:26:55,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 10:26:55,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2021-05-06 10:26:55,500 INFO L87 Difference]: Start difference. First operand 149 states and 150 transitions. Second operand has 22 states, 21 states have (on average 2.857142857142857) internal successors, (60), 21 states have internal predecessors, (60), 19 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-06 10:26:55,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 10:26:55,891 INFO L93 Difference]: Finished difference Result 154 states and 156 transitions. [2021-05-06 10:26:55,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 10:26:55,891 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 2.857142857142857) internal successors, (60), 21 states have internal predecessors, (60), 19 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) Word has length 146 [2021-05-06 10:26:55,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 10:26:55,892 INFO L225 Difference]: With dead ends: 154 [2021-05-06 10:26:55,892 INFO L226 Difference]: Without dead ends: 151 [2021-05-06 10:26:55,892 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 218.3ms TimeCoverageRelationStatistics Valid=49, Invalid=503, Unknown=0, NotChecked=0, Total=552 [2021-05-06 10:26:55,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-05-06 10:26:55,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2021-05-06 10:26:55,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 111 states have (on average 1.018018018018018) internal successors, (113), 111 states have internal predecessors, (113), 21 states have call successors, (21), 20 states have call predecessors, (21), 18 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2021-05-06 10:26:55,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 153 transitions. [2021-05-06 10:26:55,895 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 153 transitions. Word has length 146 [2021-05-06 10:26:55,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 10:26:55,895 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 153 transitions. [2021-05-06 10:26:55,895 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 2.857142857142857) internal successors, (60), 21 states have internal predecessors, (60), 19 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-06 10:26:55,895 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 153 transitions. [2021-05-06 10:26:55,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-05-06 10:26:55,895 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 10:26:55,895 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 10:26:56,104 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2021-05-06 10:26:56,105 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 10:26:56,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 10:26:56,105 INFO L82 PathProgramCache]: Analyzing trace with hash 153116436, now seen corresponding path program 17 times [2021-05-06 10:26:56,105 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 10:26:56,105 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [669855037] [2021-05-06 10:26:56,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 10:26:56,109 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 10:26:56,109 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [77029943] [2021-05-06 10:26:56,109 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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