/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/hard2_unwindbound5.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 09:13:33,128 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 09:13:33,130 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 09:13:33,170 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-06 09:13:33,170 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-06 09:13:33,171 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-06 09:13:33,173 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-06 09:13:33,174 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-06 09:13:33,175 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-06 09:13:33,176 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-06 09:13:33,177 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-06 09:13:33,178 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-06 09:13:33,178 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 09:13:33,179 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 09:13:33,180 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 09:13:33,181 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 09:13:33,181 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 09:13:33,182 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 09:13:33,183 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 09:13:33,185 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 09:13:33,186 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 09:13:33,187 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 09:13:33,188 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 09:13:33,189 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 09:13:33,191 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 09:13:33,199 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 09:13:33,200 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 09:13:33,201 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 09:13:33,202 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-06 09:13:33,211 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 09:13:33,212 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 09:13:33,213 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 09:13:33,213 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 09:13:33,214 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 09:13:33,214 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 09:13:33,214 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 09:13:33,214 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 09:13:33,214 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 09:13:33,215 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 09:13:33,215 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 09:13:33,215 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 09:13:33,215 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 09:13:33,215 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 09:13:33,215 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 09:13:33,216 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 09:13:33,216 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 09:13:33,216 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 09:13:33,216 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 09:13:33,216 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 09:13:33,217 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 09:13:33,218 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-06 09:13:33,218 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 09:13:33,526 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 09:13:33,545 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 09:13:33,548 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 09:13:33,549 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 09:13:33,549 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 09:13:33,550 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/hard2_unwindbound5.c [2021-05-06 09:13:33,618 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8e13cbeff/76fad8ee6dda4c638d635fc61fb04c80/FLAG021663aba [2021-05-06 09:13:34,101 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 09:13:34,101 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard2_unwindbound5.c [2021-05-06 09:13:34,109 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8e13cbeff/76fad8ee6dda4c638d635fc61fb04c80/FLAG021663aba [2021-05-06 09:13:34,499 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8e13cbeff/76fad8ee6dda4c638d635fc61fb04c80 [2021-05-06 09:13:34,505 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 09:13:34,509 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-06 09:13:34,511 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 09:13:34,512 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 09:13:34,515 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 09:13:34,516 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 09:13:34" (1/1) ... [2021-05-06 09:13:34,517 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1314990e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 09:13:34, skipping insertion in model container [2021-05-06 09:13:34,517 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 09:13:34" (1/1) ... [2021-05-06 09:13:34,524 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 09:13:34,543 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 09:13:34,643 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/hard2_unwindbound5.c[526,539] [2021-05-06 09:13:34,666 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 09:13:34,676 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 09:13:34,692 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/hard2_unwindbound5.c[526,539] [2021-05-06 09:13:34,717 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 09:13:34,731 INFO L208 MainTranslator]: Completed translation [2021-05-06 09:13:34,732 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 09:13:34 WrapperNode [2021-05-06 09:13:34,732 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 09:13:34,735 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 09:13:34,735 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 09:13:34,735 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 09:13:34,746 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 09:13:34" (1/1) ... [2021-05-06 09:13:34,746 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 09:13:34" (1/1) ... [2021-05-06 09:13:34,753 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 09:13:34" (1/1) ... [2021-05-06 09:13:34,753 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 09:13:34" (1/1) ... [2021-05-06 09:13:34,770 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 09:13:34" (1/1) ... [2021-05-06 09:13:34,774 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 09:13:34" (1/1) ... [2021-05-06 09:13:34,775 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 09:13:34" (1/1) ... [2021-05-06 09:13:34,777 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 09:13:34,777 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 09:13:34,778 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 09:13:34,778 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 09:13:34,778 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 09:13:34" (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 09:13:34,885 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 09:13:34,886 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 09:13:34,886 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 09:13:34,886 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 09:13:34,886 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 09:13:34,887 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 09:13:34,887 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 09:13:34,887 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 09:13:34,887 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 09:13:34,887 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 09:13:34,888 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-06 09:13:34,888 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 09:13:34,888 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 09:13:34,889 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 09:13:34,889 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 09:13:34,889 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 09:13:34,889 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 09:13:34,889 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 09:13:34,890 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 09:13:34,890 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 09:13:35,207 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 09:13:35,207 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-06 09:13:35,209 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 09:13:35 BoogieIcfgContainer [2021-05-06 09:13:35,209 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 09:13:35,209 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-06 09:13:35,210 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-06 09:13:35,210 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-06 09:13:35,213 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 09:13:35" (1/1) ... [2021-05-06 09:13:35,226 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 09:13:35 BasicIcfg [2021-05-06 09:13:35,227 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-06 09:13:35,228 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 09:13:35,228 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 09:13:35,231 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 09:13:35,231 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 09:13:34" (1/4) ... [2021-05-06 09:13:35,231 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a8e0c0a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 09:13:35, skipping insertion in model container [2021-05-06 09:13:35,231 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 09:13:34" (2/4) ... [2021-05-06 09:13:35,232 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a8e0c0a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 09:13:35, skipping insertion in model container [2021-05-06 09:13:35,232 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 09:13:35" (3/4) ... [2021-05-06 09:13:35,232 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a8e0c0a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 09:13:35, skipping insertion in model container [2021-05-06 09:13:35,232 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 09:13:35" (4/4) ... [2021-05-06 09:13:35,233 INFO L111 eAbstractionObserver]: Analyzing ICFG hard2_unwindbound5.cJordan [2021-05-06 09:13:35,238 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-06 09:13:35,241 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 09:13:35,257 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 09:13:35,274 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 09:13:35,275 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-06 09:13:35,275 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-06 09:13:35,275 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 09:13:35,275 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 09:13:35,275 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 09:13:35,275 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 09:13:35,275 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 09:13:35,287 INFO L276 IsEmpty]: Start isEmpty. Operand has 31 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 18 states have internal predecessors, (26), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 09:13:35,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 09:13:35,294 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 09:13:35,295 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 09:13:35,295 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 09:13:35,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 09:13:35,301 INFO L82 PathProgramCache]: Analyzing trace with hash 121155216, now seen corresponding path program 1 times [2021-05-06 09:13:35,308 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 09:13:35,308 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [217491421] [2021-05-06 09:13:35,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 09:13:35,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 09:13:35,499 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 09:13:35,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 09:13:35,525 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 09:13:35,526 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 09:13:35,526 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [217491421] [2021-05-06 09:13:35,527 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [217491421] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 09:13:35,527 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 09:13:35,527 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 09:13:35,529 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [28407476] [2021-05-06 09:13:35,533 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 09:13:35,533 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 09:13:35,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 09:13:35,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 09:13:35,551 INFO L87 Difference]: Start difference. First operand has 31 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 18 states have internal predecessors, (26), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 09:13:35,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 09:13:35,761 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2021-05-06 09:13:35,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 09:13:35,763 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-06 09:13:35,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 09:13:35,769 INFO L225 Difference]: With dead ends: 32 [2021-05-06 09:13:35,770 INFO L226 Difference]: Without dead ends: 27 [2021-05-06 09:13:35,771 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 66.0ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 09:13:35,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-06 09:13:35,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2021-05-06 09:13:35,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 9 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 09:13:35,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 36 transitions. [2021-05-06 09:13:35,808 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 36 transitions. Word has length 12 [2021-05-06 09:13:35,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 09:13:35,808 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 36 transitions. [2021-05-06 09:13:35,809 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 09:13:35,809 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 36 transitions. [2021-05-06 09:13:35,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 09:13:35,809 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 09:13:35,810 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 09:13:35,810 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 09:13:35,810 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 09:13:35,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 09:13:35,811 INFO L82 PathProgramCache]: Analyzing trace with hash 152644303, now seen corresponding path program 1 times [2021-05-06 09:13:35,811 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 09:13:35,811 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [977702068] [2021-05-06 09:13:35,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 09:13:35,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 09:13:36,010 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 09:13:36,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 09:13:36,019 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 09:13:36,020 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 09:13:36,020 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [977702068] [2021-05-06 09:13:36,020 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [977702068] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 09:13:36,020 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 09:13:36,020 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 09:13:36,021 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1439177085] [2021-05-06 09:13:36,022 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 09:13:36,022 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 09:13:36,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 09:13:36,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 09:13:36,023 INFO L87 Difference]: Start difference. First operand 26 states and 36 transitions. Second operand has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 09:13:36,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 09:13:36,473 INFO L93 Difference]: Finished difference Result 39 states and 54 transitions. [2021-05-06 09:13:36,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 09:13:36,474 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-06 09:13:36,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 09:13:36,481 INFO L225 Difference]: With dead ends: 39 [2021-05-06 09:13:36,481 INFO L226 Difference]: Without dead ends: 39 [2021-05-06 09:13:36,482 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 272.2ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-06 09:13:36,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-06 09:13:36,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 30. [2021-05-06 09:13:36,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 9 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 09:13:36,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 39 transitions. [2021-05-06 09:13:36,489 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 39 transitions. Word has length 12 [2021-05-06 09:13:36,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 09:13:36,489 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 39 transitions. [2021-05-06 09:13:36,489 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 09:13:36,490 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 39 transitions. [2021-05-06 09:13:36,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-06 09:13:36,490 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 09:13:36,490 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 09:13:36,491 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 09:13:36,491 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 09:13:36,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 09:13:36,491 INFO L82 PathProgramCache]: Analyzing trace with hash -400958603, now seen corresponding path program 1 times [2021-05-06 09:13:36,491 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 09:13:36,492 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [751950215] [2021-05-06 09:13:36,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 09:13:36,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 09:13:36,599 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 09:13:36,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 09:13:36,613 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 09:13:36,614 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 09:13:36,614 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [751950215] [2021-05-06 09:13:36,614 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [751950215] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 09:13:36,614 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 09:13:36,614 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 09:13:36,615 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1876447391] [2021-05-06 09:13:36,615 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 09:13:36,615 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 09:13:36,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 09:13:36,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 09:13:36,616 INFO L87 Difference]: Start difference. First operand 30 states and 39 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 09:13:36,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 09:13:36,812 INFO L93 Difference]: Finished difference Result 32 states and 41 transitions. [2021-05-06 09:13:36,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 09:13:36,813 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-06 09:13:36,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 09:13:36,815 INFO L225 Difference]: With dead ends: 32 [2021-05-06 09:13:36,815 INFO L226 Difference]: Without dead ends: 32 [2021-05-06 09:13:36,816 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 86.6ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 09:13:36,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-06 09:13:36,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-06 09:13:36,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 20 states have internal predecessors, (25), 9 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 09:13:36,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 41 transitions. [2021-05-06 09:13:36,835 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 41 transitions. Word has length 14 [2021-05-06 09:13:36,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 09:13:36,836 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 41 transitions. [2021-05-06 09:13:36,836 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 09:13:36,836 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 41 transitions. [2021-05-06 09:13:36,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 09:13:36,837 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 09:13:36,840 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 09:13:36,841 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-06 09:13:36,841 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 09:13:36,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 09:13:36,842 INFO L82 PathProgramCache]: Analyzing trace with hash 185978583, now seen corresponding path program 1 times [2021-05-06 09:13:36,842 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 09:13:36,842 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [985359039] [2021-05-06 09:13:36,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 09:13:36,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 09:13:36,943 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 09:13:36,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 09:13:36,971 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-05-06 09:13:36,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 09:13:36,979 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 09:13:36,979 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 09:13:36,979 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [985359039] [2021-05-06 09:13:36,979 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [985359039] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 09:13:36,979 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 09:13:36,980 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 09:13:36,980 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755231502] [2021-05-06 09:13:36,980 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 09:13:36,980 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 09:13:36,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 09:13:36,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 09:13:36,981 INFO L87 Difference]: Start difference. First operand 32 states and 41 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 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 09:13:37,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 09:13:37,243 INFO L93 Difference]: Finished difference Result 44 states and 58 transitions. [2021-05-06 09:13:37,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 09:13:37,244 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 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 17 [2021-05-06 09:13:37,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 09:13:37,245 INFO L225 Difference]: With dead ends: 44 [2021-05-06 09:13:37,245 INFO L226 Difference]: Without dead ends: 44 [2021-05-06 09:13:37,245 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 187.3ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-06 09:13:37,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-06 09:13:37,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 36. [2021-05-06 09:13:37,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 23 states have internal predecessors, (28), 9 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 09:13:37,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 44 transitions. [2021-05-06 09:13:37,250 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 44 transitions. Word has length 17 [2021-05-06 09:13:37,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 09:13:37,251 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 44 transitions. [2021-05-06 09:13:37,251 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 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 09:13:37,251 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 44 transitions. [2021-05-06 09:13:37,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-06 09:13:37,251 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 09:13:37,252 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 09:13:37,252 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-06 09:13:37,252 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 09:13:37,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 09:13:37,252 INFO L82 PathProgramCache]: Analyzing trace with hash -820589269, now seen corresponding path program 1 times [2021-05-06 09:13:37,253 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 09:13:37,253 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1967343222] [2021-05-06 09:13:37,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 09:13:37,263 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 09:13:37,263 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [246876123] [2021-05-06 09:13:37,263 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 09:13:37,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 09:13:37,327 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 09:13:37,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 09:13:37,446 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:37,463 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 09:13:37,464 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 09:13:37,464 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1967343222] [2021-05-06 09:13:37,464 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 09:13:37,464 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [246876123] [2021-05-06 09:13:37,464 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [246876123] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 09:13:37,464 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 09:13:37,464 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 09:13:37,465 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590308533] [2021-05-06 09:13:37,465 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 09:13:37,465 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 09:13:37,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 09:13:37,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 09:13:37,466 INFO L87 Difference]: Start difference. First operand 36 states and 44 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 09:13:37,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 09:13:37,514 INFO L93 Difference]: Finished difference Result 51 states and 66 transitions. [2021-05-06 09:13:37,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 09:13:37,514 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 22 [2021-05-06 09:13:37,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 09:13:37,515 INFO L225 Difference]: With dead ends: 51 [2021-05-06 09:13:37,516 INFO L226 Difference]: Without dead ends: 50 [2021-05-06 09:13:37,516 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 21.7ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 09:13:37,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-06 09:13:37,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-05-06 09:13:37,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 31 states have internal predecessors, (37), 15 states have call successors, (15), 6 states have call predecessors, (15), 5 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-06 09:13:37,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 64 transitions. [2021-05-06 09:13:37,522 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 64 transitions. Word has length 22 [2021-05-06 09:13:37,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 09:13:37,522 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 64 transitions. [2021-05-06 09:13:37,522 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 09:13:37,522 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 64 transitions. [2021-05-06 09:13:37,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-06 09:13:37,523 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 09:13:37,523 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 09:13:37,749 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 09:13:37,749 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 09:13:37,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 09:13:37,751 INFO L82 PathProgramCache]: Analyzing trace with hash 1259710898, now seen corresponding path program 1 times [2021-05-06 09:13:37,751 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 09:13:37,751 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1527884063] [2021-05-06 09:13:37,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 09:13:37,763 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 09:13:37,763 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1618555750] [2021-05-06 09:13:37,763 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 09:13:37,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 09:13:37,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 09:13:37,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 09:13:37,864 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:37,868 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:37,869 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:37,877 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:37,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:37,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:37,953 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:37,968 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:37,982 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-06 09:13:37,983 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 09:13:37,983 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1527884063] [2021-05-06 09:13:37,983 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 09:13:37,983 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1618555750] [2021-05-06 09:13:37,983 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1618555750] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 09:13:37,983 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 09:13:37,983 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 09:13:37,983 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [180075292] [2021-05-06 09:13:37,984 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 09:13:37,984 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 09:13:37,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 09:13:37,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 09:13:37,985 INFO L87 Difference]: Start difference. First operand 50 states and 64 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, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 09:13:38,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 09:13:38,023 INFO L93 Difference]: Finished difference Result 63 states and 73 transitions. [2021-05-06 09:13:38,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 09:13:38,037 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, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 30 [2021-05-06 09:13:38,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 09:13:38,038 INFO L225 Difference]: With dead ends: 63 [2021-05-06 09:13:38,038 INFO L226 Difference]: Without dead ends: 63 [2021-05-06 09:13:38,039 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 35.2ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 09:13:38,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-06 09:13:38,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2021-05-06 09:13:38,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 38 states have (on average 1.1842105263157894) internal successors, (45), 40 states have internal predecessors, (45), 15 states have call successors, (15), 9 states have call predecessors, (15), 8 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-06 09:13:38,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 72 transitions. [2021-05-06 09:13:38,044 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 72 transitions. Word has length 30 [2021-05-06 09:13:38,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 09:13:38,044 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 72 transitions. [2021-05-06 09:13:38,044 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, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 09:13:38,044 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 72 transitions. [2021-05-06 09:13:38,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-06 09:13:38,045 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 09:13:38,045 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 09:13:38,246 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 09:13:38,246 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 09:13:38,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 09:13:38,247 INFO L82 PathProgramCache]: Analyzing trace with hash 1260813165, now seen corresponding path program 1 times [2021-05-06 09:13:38,247 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 09:13:38,247 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [249024041] [2021-05-06 09:13:38,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 09:13:38,256 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 09:13:38,256 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [741734958] [2021-05-06 09:13:38,256 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 09:13:38,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 09:13:38,311 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 09:13:38,313 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 09:13:38,383 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:38,392 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-06 09:13:38,393 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 09:13:38,393 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [249024041] [2021-05-06 09:13:38,393 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 09:13:38,393 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [741734958] [2021-05-06 09:13:38,393 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [741734958] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 09:13:38,393 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 09:13:38,393 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 09:13:38,393 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1115993332] [2021-05-06 09:13:38,394 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 09:13:38,394 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 09:13:38,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 09:13:38,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 09:13:38,395 INFO L87 Difference]: Start difference. First operand 62 states and 72 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 09:13:38,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 09:13:38,453 INFO L93 Difference]: Finished difference Result 74 states and 89 transitions. [2021-05-06 09:13:38,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 09:13:38,453 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), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 30 [2021-05-06 09:13:38,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 09:13:38,454 INFO L225 Difference]: With dead ends: 74 [2021-05-06 09:13:38,454 INFO L226 Difference]: Without dead ends: 64 [2021-05-06 09:13:38,454 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 18.2ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 09:13:38,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-06 09:13:38,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2021-05-06 09:13:38,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 41 states have internal predecessors, (48), 15 states have call successors, (15), 9 states have call predecessors, (15), 8 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-06 09:13:38,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 76 transitions. [2021-05-06 09:13:38,460 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 76 transitions. Word has length 30 [2021-05-06 09:13:38,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 09:13:38,460 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 76 transitions. [2021-05-06 09:13:38,460 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), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 09:13:38,460 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 76 transitions. [2021-05-06 09:13:38,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-06 09:13:38,461 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 09:13:38,461 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 09:13:38,671 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 09:13:38,671 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 09:13:38,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 09:13:38,671 INFO L82 PathProgramCache]: Analyzing trace with hash 1811137592, now seen corresponding path program 1 times [2021-05-06 09:13:38,672 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 09:13:38,672 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1884966091] [2021-05-06 09:13:38,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 09:13:38,679 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 09:13:38,680 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [127304470] [2021-05-06 09:13:38,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 09:13:38,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 09:13:38,745 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 09:13:38,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 09:13:38,772 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:38,777 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:38,779 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:38,796 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:38,805 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:38,807 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:38,859 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:38,867 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:38,904 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 18 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-05-06 09:13:38,904 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 09:13:38,905 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1884966091] [2021-05-06 09:13:38,905 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 09:13:38,905 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [127304470] [2021-05-06 09:13:38,906 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [127304470] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 09:13:38,907 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 09:13:38,909 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-06 09:13:38,909 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [956567347] [2021-05-06 09:13:38,910 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 09:13:38,910 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 09:13:38,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 09:13:38,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 09:13:38,911 INFO L87 Difference]: Start difference. First operand 63 states and 76 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-06 09:13:38,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 09:13:38,963 INFO L93 Difference]: Finished difference Result 65 states and 78 transitions. [2021-05-06 09:13:38,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 09:13:38,964 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 37 [2021-05-06 09:13:38,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 09:13:38,968 INFO L225 Difference]: With dead ends: 65 [2021-05-06 09:13:38,969 INFO L226 Difference]: Without dead ends: 65 [2021-05-06 09:13:38,970 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 25.3ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 09:13:38,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-06 09:13:38,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2021-05-06 09:13:38,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 41 states have (on average 1.2195121951219512) internal successors, (50), 43 states have internal predecessors, (50), 15 states have call successors, (15), 9 states have call predecessors, (15), 8 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-06 09:13:38,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2021-05-06 09:13:38,991 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 37 [2021-05-06 09:13:38,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 09:13:38,992 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2021-05-06 09:13:38,992 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-06 09:13:38,992 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2021-05-06 09:13:38,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-06 09:13:38,994 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 09:13:38,994 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 09:13:39,210 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 09:13:39,211 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 09:13:39,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 09:13:39,211 INFO L82 PathProgramCache]: Analyzing trace with hash -599722260, now seen corresponding path program 1 times [2021-05-06 09:13:39,211 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 09:13:39,212 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [110033000] [2021-05-06 09:13:39,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 09:13:39,219 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 09:13:39,219 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1592056295] [2021-05-06 09:13:39,219 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 09:13:39,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 09:13:39,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-06 09:13:39,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 09:13:39,392 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:39,403 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-06 09:13:39,403 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 09:13:39,404 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [110033000] [2021-05-06 09:13:39,404 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 09:13:39,404 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1592056295] [2021-05-06 09:13:39,404 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1592056295] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 09:13:39,404 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 09:13:39,404 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 09:13:39,404 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669555557] [2021-05-06 09:13:39,405 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 09:13:39,405 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 09:13:39,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 09:13:39,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 09:13:39,405 INFO L87 Difference]: Start difference. First operand 65 states and 78 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, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-06 09:13:39,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 09:13:39,495 INFO L93 Difference]: Finished difference Result 94 states and 123 transitions. [2021-05-06 09:13:39,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 09:13:39,496 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, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 40 [2021-05-06 09:13:39,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 09:13:39,497 INFO L225 Difference]: With dead ends: 94 [2021-05-06 09:13:39,497 INFO L226 Difference]: Without dead ends: 87 [2021-05-06 09:13:39,497 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 24.1ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-06 09:13:39,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-06 09:13:39,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 85. [2021-05-06 09:13:39,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 52 states have (on average 1.2307692307692308) internal successors, (64), 55 states have internal predecessors, (64), 23 states have call successors, (23), 10 states have call predecessors, (23), 9 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2021-05-06 09:13:39,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 107 transitions. [2021-05-06 09:13:39,515 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 107 transitions. Word has length 40 [2021-05-06 09:13:39,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 09:13:39,515 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 107 transitions. [2021-05-06 09:13:39,515 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, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-06 09:13:39,515 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 107 transitions. [2021-05-06 09:13:39,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-06 09:13:39,521 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 09:13:39,521 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 09:13:39,722 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 09:13:39,722 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 09:13:39,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 09:13:39,723 INFO L82 PathProgramCache]: Analyzing trace with hash 560903707, now seen corresponding path program 1 times [2021-05-06 09:13:39,723 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 09:13:39,723 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1723022891] [2021-05-06 09:13:39,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 09:13:39,730 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 09:13:39,731 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [359962259] [2021-05-06 09:13:39,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 09:13:39,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 09:13:39,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 09:13:39,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 09:13:39,840 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:39,843 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:39,844 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:39,856 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:39,863 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:39,866 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:39,898 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:39,900 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:39,901 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:39,929 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:39,934 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:39,956 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 36 proven. 42 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-06 09:13:39,956 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 09:13:39,957 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1723022891] [2021-05-06 09:13:39,957 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 09:13:39,957 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [359962259] [2021-05-06 09:13:39,959 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [359962259] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 09:13:39,959 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 09:13:39,959 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 09:13:39,959 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065117996] [2021-05-06 09:13:39,960 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 09:13:39,960 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 09:13:39,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 09:13:39,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 09:13:39,961 INFO L87 Difference]: Start difference. First operand 85 states and 107 transitions. Second operand has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 5 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-06 09:13:40,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 09:13:40,010 INFO L93 Difference]: Finished difference Result 98 states and 116 transitions. [2021-05-06 09:13:40,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 09:13:40,010 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 5 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 53 [2021-05-06 09:13:40,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 09:13:40,013 INFO L225 Difference]: With dead ends: 98 [2021-05-06 09:13:40,013 INFO L226 Difference]: Without dead ends: 98 [2021-05-06 09:13:40,014 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 11.1ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 09:13:40,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-05-06 09:13:40,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2021-05-06 09:13:40,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 61 states have (on average 1.180327868852459) internal successors, (72), 64 states have internal predecessors, (72), 23 states have call successors, (23), 13 states have call predecessors, (23), 12 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2021-05-06 09:13:40,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 115 transitions. [2021-05-06 09:13:40,030 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 115 transitions. Word has length 53 [2021-05-06 09:13:40,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 09:13:40,032 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 115 transitions. [2021-05-06 09:13:40,032 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 5 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-06 09:13:40,032 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 115 transitions. [2021-05-06 09:13:40,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 09:13:40,034 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 09:13:40,034 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 09:13:40,241 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 09:13:40,241 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 09:13:40,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 09:13:40,241 INFO L82 PathProgramCache]: Analyzing trace with hash -1861566377, now seen corresponding path program 2 times [2021-05-06 09:13:40,242 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 09:13:40,242 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1257032048] [2021-05-06 09:13:40,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 09:13:40,248 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 09:13:40,248 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [219116852] [2021-05-06 09:13:40,249 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 09:13:40,328 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 09:13:40,328 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 09:13:40,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 09:13:40,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 09:13:40,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:40,348 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:40,349 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:40,355 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:40,357 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:40,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:40,393 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:40,396 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:40,401 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:40,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:40,434 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:40,454 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 36 proven. 46 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-06 09:13:40,454 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 09:13:40,454 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1257032048] [2021-05-06 09:13:40,454 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 09:13:40,455 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [219116852] [2021-05-06 09:13:40,455 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [219116852] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 09:13:40,455 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 09:13:40,455 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 09:13:40,455 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1574730004] [2021-05-06 09:13:40,456 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 09:13:40,456 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 09:13:40,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 09:13:40,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 09:13:40,457 INFO L87 Difference]: Start difference. First operand 97 states and 115 transitions. Second operand has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-06 09:13:40,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 09:13:40,501 INFO L93 Difference]: Finished difference Result 99 states and 117 transitions. [2021-05-06 09:13:40,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 09:13:40,502 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 55 [2021-05-06 09:13:40,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 09:13:40,505 INFO L225 Difference]: With dead ends: 99 [2021-05-06 09:13:40,506 INFO L226 Difference]: Without dead ends: 99 [2021-05-06 09:13:40,506 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 20.0ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-06 09:13:40,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-05-06 09:13:40,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2021-05-06 09:13:40,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 63 states have (on average 1.1746031746031746) internal successors, (74), 66 states have internal predecessors, (74), 23 states have call successors, (23), 13 states have call predecessors, (23), 12 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2021-05-06 09:13:40,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 117 transitions. [2021-05-06 09:13:40,512 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 117 transitions. Word has length 55 [2021-05-06 09:13:40,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 09:13:40,513 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 117 transitions. [2021-05-06 09:13:40,513 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-06 09:13:40,513 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 117 transitions. [2021-05-06 09:13:40,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 09:13:40,514 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 09:13:40,514 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 09:13:40,728 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 09:13:40,729 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 09:13:40,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 09:13:40,729 INFO L82 PathProgramCache]: Analyzing trace with hash 168202861, now seen corresponding path program 2 times [2021-05-06 09:13:40,730 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 09:13:40,730 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1612070425] [2021-05-06 09:13:40,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 09:13:40,736 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 09:13:40,736 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [797264470] [2021-05-06 09:13:40,736 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 09:13:40,790 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 09:13:40,790 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 09:13:40,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-06 09:13:40,793 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 09:13:40,913 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:40,923 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 16 proven. 16 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-05-06 09:13:40,923 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 09:13:40,923 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1612070425] [2021-05-06 09:13:40,923 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 09:13:40,923 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [797264470] [2021-05-06 09:13:40,923 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [797264470] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 09:13:40,924 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 09:13:40,924 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 09:13:40,924 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [555241870] [2021-05-06 09:13:40,924 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 09:13:40,924 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 09:13:40,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 09:13:40,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-06 09:13:40,925 INFO L87 Difference]: Start difference. First operand 99 states and 117 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-06 09:13:41,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 09:13:41,051 INFO L93 Difference]: Finished difference Result 143 states and 187 transitions. [2021-05-06 09:13:41,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 09:13:41,052 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) Word has length 58 [2021-05-06 09:13:41,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 09:13:41,053 INFO L225 Difference]: With dead ends: 143 [2021-05-06 09:13:41,053 INFO L226 Difference]: Without dead ends: 136 [2021-05-06 09:13:41,054 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 31.5ms TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-06 09:13:41,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-05-06 09:13:41,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 129. [2021-05-06 09:13:41,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 81 states have (on average 1.2222222222222223) internal successors, (99), 85 states have internal predecessors, (99), 34 states have call successors, (34), 14 states have call predecessors, (34), 13 states have return successors, (31), 29 states have call predecessors, (31), 31 states have call successors, (31) [2021-05-06 09:13:41,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 164 transitions. [2021-05-06 09:13:41,061 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 164 transitions. Word has length 58 [2021-05-06 09:13:41,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 09:13:41,062 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 164 transitions. [2021-05-06 09:13:41,062 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-06 09:13:41,062 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 164 transitions. [2021-05-06 09:13:41,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-06 09:13:41,063 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 09:13:41,063 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 09:13:41,276 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-06 09:13:41,277 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 09:13:41,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 09:13:41,277 INFO L82 PathProgramCache]: Analyzing trace with hash -454321759, now seen corresponding path program 1 times [2021-05-06 09:13:41,277 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 09:13:41,277 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1984560669] [2021-05-06 09:13:41,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 09:13:41,283 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 09:13:41,283 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1828406981] [2021-05-06 09:13:41,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 09:13:41,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 09:13:41,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 09:13:41,353 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 09:13:41,362 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:41,364 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:41,365 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:41,370 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:41,372 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:41,372 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:41,410 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:41,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:41,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:41,474 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:41,476 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:41,476 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:41,500 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:41,502 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:41,512 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 16 proven. 92 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-06 09:13:41,512 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 09:13:41,512 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1984560669] [2021-05-06 09:13:41,513 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 09:13:41,513 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1828406981] [2021-05-06 09:13:41,513 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1828406981] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 09:13:41,513 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 09:13:41,513 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 09:13:41,513 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [330415479] [2021-05-06 09:13:41,513 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 09:13:41,513 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 09:13:41,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 09:13:41,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-06 09:13:41,516 INFO L87 Difference]: Start difference. First operand 129 states and 164 transitions. Second operand has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (11), 6 states have call predecessors, (11), 4 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-06 09:13:41,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 09:13:41,580 INFO L93 Difference]: Finished difference Result 150 states and 178 transitions. [2021-05-06 09:13:41,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 09:13:41,581 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (11), 6 states have call predecessors, (11), 4 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) Word has length 62 [2021-05-06 09:13:41,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 09:13:41,583 INFO L225 Difference]: With dead ends: 150 [2021-05-06 09:13:41,583 INFO L226 Difference]: Without dead ends: 150 [2021-05-06 09:13:41,584 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 45.5ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-06 09:13:41,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-05-06 09:13:41,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 149. [2021-05-06 09:13:41,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 96 states have (on average 1.1666666666666667) internal successors, (112), 100 states have internal predecessors, (112), 34 states have call successors, (34), 19 states have call predecessors, (34), 18 states have return successors, (31), 29 states have call predecessors, (31), 31 states have call successors, (31) [2021-05-06 09:13:41,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 177 transitions. [2021-05-06 09:13:41,596 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 177 transitions. Word has length 62 [2021-05-06 09:13:41,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 09:13:41,597 INFO L480 AbstractCegarLoop]: Abstraction has 149 states and 177 transitions. [2021-05-06 09:13:41,597 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (11), 6 states have call predecessors, (11), 4 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-06 09:13:41,597 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 177 transitions. [2021-05-06 09:13:41,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-06 09:13:41,597 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 09:13:41,598 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 09:13:41,812 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 09:13:41,813 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 09:13:41,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 09:13:41,813 INFO L82 PathProgramCache]: Analyzing trace with hash -453219492, now seen corresponding path program 1 times [2021-05-06 09:13:41,813 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 09:13:41,813 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1255620895] [2021-05-06 09:13:41,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 09:13:41,820 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 09:13:41,820 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1345105146] [2021-05-06 09:13:41,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 09:13:41,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 09:13:41,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-06 09:13:41,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 09:13:42,011 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:42,020 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-05-06 09:13:42,020 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 09:13:42,020 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1255620895] [2021-05-06 09:13:42,021 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 09:13:42,021 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1345105146] [2021-05-06 09:13:42,021 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1345105146] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 09:13:42,021 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 09:13:42,021 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 09:13:42,021 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [858966154] [2021-05-06 09:13:42,021 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 09:13:42,021 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 09:13:42,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 09:13:42,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-06 09:13:42,022 INFO L87 Difference]: Start difference. First operand 149 states and 177 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-06 09:13:42,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 09:13:42,115 INFO L93 Difference]: Finished difference Result 155 states and 182 transitions. [2021-05-06 09:13:42,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 09:13:42,115 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 62 [2021-05-06 09:13:42,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 09:13:42,116 INFO L225 Difference]: With dead ends: 155 [2021-05-06 09:13:42,116 INFO L226 Difference]: Without dead ends: 155 [2021-05-06 09:13:42,117 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 39.6ms TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-06 09:13:42,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-05-06 09:13:42,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 153. [2021-05-06 09:13:42,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 99 states have (on average 1.1616161616161615) internal successors, (115), 103 states have internal predecessors, (115), 34 states have call successors, (34), 20 states have call predecessors, (34), 19 states have return successors, (31), 29 states have call predecessors, (31), 31 states have call successors, (31) [2021-05-06 09:13:42,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 180 transitions. [2021-05-06 09:13:42,121 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 180 transitions. Word has length 62 [2021-05-06 09:13:42,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 09:13:42,121 INFO L480 AbstractCegarLoop]: Abstraction has 153 states and 180 transitions. [2021-05-06 09:13:42,121 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-06 09:13:42,121 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 180 transitions. [2021-05-06 09:13:42,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 09:13:42,122 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 09:13:42,122 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 10, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 09:13:42,339 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 09:13:42,339 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 09:13:42,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 09:13:42,340 INFO L82 PathProgramCache]: Analyzing trace with hash 929445032, now seen corresponding path program 1 times [2021-05-06 09:13:42,340 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 09:13:42,340 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1667512614] [2021-05-06 09:13:42,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 09:13:42,346 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 09:13:42,346 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [542549287] [2021-05-06 09:13:42,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 09:13:42,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 09:13:42,400 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-06 09:13:42,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 09:13:42,585 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:42,595 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 20 proven. 11 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-05-06 09:13:42,595 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 09:13:42,595 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1667512614] [2021-05-06 09:13:42,596 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 09:13:42,596 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [542549287] [2021-05-06 09:13:42,596 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [542549287] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 09:13:42,596 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 09:13:42,596 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-06 09:13:42,598 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1849176249] [2021-05-06 09:13:42,598 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 09:13:42,598 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 09:13:42,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 09:13:42,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-06 09:13:42,599 INFO L87 Difference]: Start difference. First operand 153 states and 180 transitions. Second operand has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 5 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) [2021-05-06 09:13:42,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 09:13:42,706 INFO L93 Difference]: Finished difference Result 159 states and 185 transitions. [2021-05-06 09:13:42,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 09:13:42,706 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 5 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) Word has length 73 [2021-05-06 09:13:42,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 09:13:42,707 INFO L225 Difference]: With dead ends: 159 [2021-05-06 09:13:42,707 INFO L226 Difference]: Without dead ends: 127 [2021-05-06 09:13:42,708 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 48.0ms TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-06 09:13:42,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-05-06 09:13:42,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2021-05-06 09:13:42,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 81 states have (on average 1.1851851851851851) internal successors, (96), 84 states have internal predecessors, (96), 30 states have call successors, (30), 16 states have call predecessors, (30), 15 states have return successors, (27), 26 states have call predecessors, (27), 27 states have call successors, (27) [2021-05-06 09:13:42,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 153 transitions. [2021-05-06 09:13:42,713 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 153 transitions. Word has length 73 [2021-05-06 09:13:42,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 09:13:42,714 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 153 transitions. [2021-05-06 09:13:42,714 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 5 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) [2021-05-06 09:13:42,714 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 153 transitions. [2021-05-06 09:13:42,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 09:13:42,715 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 09:13:42,715 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 10, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 09:13:42,930 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-06 09:13:42,931 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 09:13:42,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 09:13:42,931 INFO L82 PathProgramCache]: Analyzing trace with hash 2088538806, now seen corresponding path program 3 times [2021-05-06 09:13:42,931 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 09:13:42,931 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1847007327] [2021-05-06 09:13:42,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 09:13:42,938 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 09:13:42,938 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [40453440] [2021-05-06 09:13:42,938 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 09:13:43,038 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-06 09:13:43,038 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 09:13:43,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 09:13:43,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 09:13:43,050 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:43,052 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:43,053 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:43,062 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:43,063 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:43,064 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:43,090 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:43,091 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:43,092 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:43,117 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:43,118 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:43,120 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:43,144 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:43,146 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:43,161 INFO L134 CoverageAnalysis]: Checked inductivity of 224 backedges. 54 proven. 132 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-05-06 09:13:43,161 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 09:13:43,161 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1847007327] [2021-05-06 09:13:43,161 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 09:13:43,161 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [40453440] [2021-05-06 09:13:43,161 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [40453440] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 09:13:43,161 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 09:13:43,161 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 09:13:43,161 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764248468] [2021-05-06 09:13:43,162 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 09:13:43,162 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 09:13:43,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 09:13:43,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-06 09:13:43,163 INFO L87 Difference]: Start difference. First operand 127 states and 153 transitions. Second operand has 7 states, 7 states have (on average 4.285714285714286) internal successors, (30), 6 states have internal predecessors, (30), 6 states have call successors, (13), 6 states have call predecessors, (13), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2021-05-06 09:13:43,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 09:13:43,223 INFO L93 Difference]: Finished difference Result 129 states and 155 transitions. [2021-05-06 09:13:43,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 09:13:43,224 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.285714285714286) internal successors, (30), 6 states have internal predecessors, (30), 6 states have call successors, (13), 6 states have call predecessors, (13), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) Word has length 73 [2021-05-06 09:13:43,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 09:13:43,225 INFO L225 Difference]: With dead ends: 129 [2021-05-06 09:13:43,225 INFO L226 Difference]: Without dead ends: 129 [2021-05-06 09:13:43,226 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 28.1ms TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-05-06 09:13:43,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-05-06 09:13:43,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 129. [2021-05-06 09:13:43,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 83 states have (on average 1.180722891566265) internal successors, (98), 86 states have internal predecessors, (98), 30 states have call successors, (30), 16 states have call predecessors, (30), 15 states have return successors, (27), 26 states have call predecessors, (27), 27 states have call successors, (27) [2021-05-06 09:13:43,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 155 transitions. [2021-05-06 09:13:43,230 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 155 transitions. Word has length 73 [2021-05-06 09:13:43,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 09:13:43,231 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 155 transitions. [2021-05-06 09:13:43,231 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.285714285714286) internal successors, (30), 6 states have internal predecessors, (30), 6 states have call successors, (13), 6 states have call predecessors, (13), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2021-05-06 09:13:43,231 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 155 transitions. [2021-05-06 09:13:43,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 09:13:43,232 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 09:13:43,232 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 09:13:43,444 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-06 09:13:43,445 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 09:13:43,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 09:13:43,445 INFO L82 PathProgramCache]: Analyzing trace with hash -57233490, now seen corresponding path program 3 times [2021-05-06 09:13:43,446 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 09:13:43,446 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1415983118] [2021-05-06 09:13:43,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 09:13:43,456 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 09:13:43,457 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [816741689] [2021-05-06 09:13:43,457 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 09:13:43,519 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-06 09:13:43,519 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 09:13:43,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-06 09:13:43,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 09:13:43,677 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:43,679 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:43,696 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:43,699 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:43,711 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:43,720 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 72 proven. 7 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-06 09:13:43,720 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 09:13:43,720 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1415983118] [2021-05-06 09:13:43,721 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 09:13:43,721 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [816741689] [2021-05-06 09:13:43,721 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [816741689] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 09:13:43,721 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 09:13:43,721 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-06 09:13:43,723 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1469036776] [2021-05-06 09:13:43,724 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 09:13:43,724 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 09:13:43,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 09:13:43,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-05-06 09:13:43,725 INFO L87 Difference]: Start difference. First operand 129 states and 155 transitions. Second operand has 10 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 5 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-06 09:13:43,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 09:13:43,913 INFO L93 Difference]: Finished difference Result 158 states and 195 transitions. [2021-05-06 09:13:43,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 09:13:43,914 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 5 states have call predecessors, (9), 4 states have call successors, (9) Word has length 76 [2021-05-06 09:13:43,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 09:13:43,915 INFO L225 Difference]: With dead ends: 158 [2021-05-06 09:13:43,915 INFO L226 Difference]: Without dead ends: 158 [2021-05-06 09:13:43,916 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 67.6ms TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-05-06 09:13:43,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2021-05-06 09:13:43,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 153. [2021-05-06 09:13:43,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 99 states have (on average 1.1919191919191918) internal successors, (118), 102 states have internal predecessors, (118), 36 states have call successors, (36), 18 states have call predecessors, (36), 17 states have return successors, (33), 32 states have call predecessors, (33), 33 states have call successors, (33) [2021-05-06 09:13:43,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 187 transitions. [2021-05-06 09:13:43,926 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 187 transitions. Word has length 76 [2021-05-06 09:13:43,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 09:13:43,928 INFO L480 AbstractCegarLoop]: Abstraction has 153 states and 187 transitions. [2021-05-06 09:13:43,928 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 5 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-06 09:13:43,928 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 187 transitions. [2021-05-06 09:13:43,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-05-06 09:13:43,930 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 09:13:43,930 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 09:13:44,153 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-06 09:13:44,153 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 09:13:44,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 09:13:44,153 INFO L82 PathProgramCache]: Analyzing trace with hash -1413927326, now seen corresponding path program 2 times [2021-05-06 09:13:44,154 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 09:13:44,154 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1877557928] [2021-05-06 09:13:44,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 09:13:44,170 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 09:13:44,170 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1841932096] [2021-05-06 09:13:44,170 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 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 09:13:44,229 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 09:13:44,229 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 09:13:44,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-06 09:13:44,232 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 09:13:44,240 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:44,241 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:44,242 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:44,246 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:44,247 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:44,248 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:44,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:44,278 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:44,279 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:44,305 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:44,306 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:44,307 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:44,332 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:44,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:44,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:44,356 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:44,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:44,368 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 22 proven. 200 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-06 09:13:44,369 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 09:13:44,369 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1877557928] [2021-05-06 09:13:44,369 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 09:13:44,369 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1841932096] [2021-05-06 09:13:44,369 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1841932096] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 09:13:44,369 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 09:13:44,369 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-06 09:13:44,370 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490867100] [2021-05-06 09:13:44,371 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 09:13:44,371 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 09:13:44,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 09:13:44,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-06 09:13:44,372 INFO L87 Difference]: Start difference. First operand 153 states and 187 transitions. Second operand has 8 states, 8 states have (on average 4.125) internal successors, (33), 7 states have internal predecessors, (33), 7 states have call successors, (14), 7 states have call predecessors, (14), 5 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2021-05-06 09:13:44,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 09:13:44,438 INFO L93 Difference]: Finished difference Result 180 states and 211 transitions. [2021-05-06 09:13:44,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 09:13:44,438 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.125) internal successors, (33), 7 states have internal predecessors, (33), 7 states have call successors, (14), 7 states have call predecessors, (14), 5 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) Word has length 80 [2021-05-06 09:13:44,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 09:13:44,439 INFO L225 Difference]: With dead ends: 180 [2021-05-06 09:13:44,439 INFO L226 Difference]: Without dead ends: 180 [2021-05-06 09:13:44,440 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 28.0ms TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-05-06 09:13:44,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2021-05-06 09:13:44,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 179. [2021-05-06 09:13:44,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 117 states have (on average 1.1538461538461537) internal successors, (135), 120 states have internal predecessors, (135), 39 states have call successors, (39), 23 states have call predecessors, (39), 22 states have return successors, (36), 35 states have call predecessors, (36), 36 states have call successors, (36) [2021-05-06 09:13:44,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 210 transitions. [2021-05-06 09:13:44,446 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 210 transitions. Word has length 80 [2021-05-06 09:13:44,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 09:13:44,446 INFO L480 AbstractCegarLoop]: Abstraction has 179 states and 210 transitions. [2021-05-06 09:13:44,446 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.125) internal successors, (33), 7 states have internal predecessors, (33), 7 states have call successors, (14), 7 states have call predecessors, (14), 5 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2021-05-06 09:13:44,446 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 210 transitions. [2021-05-06 09:13:44,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-05-06 09:13:44,447 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 09:13:44,447 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 09:13:44,660 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 09:13:44,661 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 09:13:44,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 09:13:44,661 INFO L82 PathProgramCache]: Analyzing trace with hash -1412825059, now seen corresponding path program 2 times [2021-05-06 09:13:44,661 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 09:13:44,661 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2053651127] [2021-05-06 09:13:44,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 09:13:44,671 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 09:13:44,671 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2058594464] [2021-05-06 09:13:44,671 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 09:13:44,727 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 09:13:44,727 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 09:13:44,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-06 09:13:44,730 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 09:13:44,899 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:44,908 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 22 proven. 21 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-05-06 09:13:44,908 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 09:13:44,909 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2053651127] [2021-05-06 09:13:44,909 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 09:13:44,909 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2058594464] [2021-05-06 09:13:44,909 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2058594464] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 09:13:44,909 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 09:13:44,909 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-06 09:13:44,909 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537011097] [2021-05-06 09:13:44,911 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 09:13:44,911 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 09:13:44,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 09:13:44,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-06 09:13:44,911 INFO L87 Difference]: Start difference. First operand 179 states and 210 transitions. Second operand has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 5 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-06 09:13:45,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 09:13:45,063 INFO L93 Difference]: Finished difference Result 197 states and 228 transitions. [2021-05-06 09:13:45,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 09:13:45,064 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 5 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 80 [2021-05-06 09:13:45,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 09:13:45,065 INFO L225 Difference]: With dead ends: 197 [2021-05-06 09:13:45,065 INFO L226 Difference]: Without dead ends: 197 [2021-05-06 09:13:45,066 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 52.7ms TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-06 09:13:45,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2021-05-06 09:13:45,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 194. [2021-05-06 09:13:45,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 128 states have (on average 1.1484375) internal successors, (147), 132 states have internal predecessors, (147), 40 states have call successors, (40), 26 states have call predecessors, (40), 25 states have return successors, (37), 35 states have call predecessors, (37), 37 states have call successors, (37) [2021-05-06 09:13:45,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 224 transitions. [2021-05-06 09:13:45,095 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 224 transitions. Word has length 80 [2021-05-06 09:13:45,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 09:13:45,096 INFO L480 AbstractCegarLoop]: Abstraction has 194 states and 224 transitions. [2021-05-06 09:13:45,096 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 5 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-06 09:13:45,096 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 224 transitions. [2021-05-06 09:13:45,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-06 09:13:45,097 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 09:13:45,097 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 13, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 09:13:45,312 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 09:13:45,313 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 09:13:45,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 09:13:45,313 INFO L82 PathProgramCache]: Analyzing trace with hash -468178091, now seen corresponding path program 4 times [2021-05-06 09:13:45,313 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 09:13:45,313 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1855084302] [2021-05-06 09:13:45,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 09:13:45,318 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 09:13:45,318 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1909004548] [2021-05-06 09:13:45,318 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 09:13:45,371 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 09:13:45,371 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 09:13:45,372 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-06 09:13:45,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 09:13:45,384 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:45,392 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:45,392 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:45,401 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:45,402 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:45,403 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:45,430 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:45,431 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:45,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:45,457 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:45,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:45,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:45,484 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:45,486 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:45,486 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:45,512 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:45,514 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:45,529 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 72 proven. 260 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2021-05-06 09:13:45,529 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 09:13:45,530 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1855084302] [2021-05-06 09:13:45,530 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 09:13:45,530 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1909004548] [2021-05-06 09:13:45,530 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1909004548] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 09:13:45,530 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 09:13:45,530 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-06 09:13:45,530 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1879771320] [2021-05-06 09:13:45,530 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 09:13:45,530 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 09:13:45,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 09:13:45,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-06 09:13:45,531 INFO L87 Difference]: Start difference. First operand 194 states and 224 transitions. Second operand has 8 states, 8 states have (on average 4.5) internal successors, (36), 7 states have internal predecessors, (36), 7 states have call successors, (16), 7 states have call predecessors, (16), 6 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) [2021-05-06 09:13:45,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 09:13:45,618 INFO L93 Difference]: Finished difference Result 196 states and 226 transitions. [2021-05-06 09:13:45,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 09:13:45,619 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.5) internal successors, (36), 7 states have internal predecessors, (36), 7 states have call successors, (16), 7 states have call predecessors, (16), 6 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) Word has length 91 [2021-05-06 09:13:45,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 09:13:45,620 INFO L225 Difference]: With dead ends: 196 [2021-05-06 09:13:45,620 INFO L226 Difference]: Without dead ends: 196 [2021-05-06 09:13:45,620 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 47.8ms TimeCoverageRelationStatistics Valid=51, Invalid=81, Unknown=0, NotChecked=0, Total=132 [2021-05-06 09:13:45,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-05-06 09:13:45,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2021-05-06 09:13:45,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 130 states have (on average 1.146153846153846) internal successors, (149), 134 states have internal predecessors, (149), 40 states have call successors, (40), 26 states have call predecessors, (40), 25 states have return successors, (37), 35 states have call predecessors, (37), 37 states have call successors, (37) [2021-05-06 09:13:45,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 226 transitions. [2021-05-06 09:13:45,626 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 226 transitions. Word has length 91 [2021-05-06 09:13:45,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 09:13:45,627 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 226 transitions. [2021-05-06 09:13:45,627 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.5) internal successors, (36), 7 states have internal predecessors, (36), 7 states have call successors, (16), 7 states have call predecessors, (16), 6 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) [2021-05-06 09:13:45,627 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 226 transitions. [2021-05-06 09:13:45,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-05-06 09:13:45,628 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 09:13:45,628 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 09:13:45,845 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 09:13:45,845 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 09:13:45,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 09:13:45,845 INFO L82 PathProgramCache]: Analyzing trace with hash -2091436208, now seen corresponding path program 3 times [2021-05-06 09:13:45,845 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 09:13:45,845 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2115241973] [2021-05-06 09:13:45,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 09:13:45,859 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 09:13:45,859 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [973164464] [2021-05-06 09:13:45,859 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 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 09:13:45,927 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-06 09:13:45,927 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 09:13:45,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 37 conjunts are in the unsatisfiable core [2021-05-06 09:13:45,931 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 09:13:46,122 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:46,135 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 26 proven. 28 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2021-05-06 09:13:46,135 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 09:13:46,135 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2115241973] [2021-05-06 09:13:46,135 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 09:13:46,136 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [973164464] [2021-05-06 09:13:46,136 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [973164464] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 09:13:46,136 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 09:13:46,136 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-06 09:13:46,136 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1397675080] [2021-05-06 09:13:46,137 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 09:13:46,137 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 09:13:46,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 09:13:46,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-05-06 09:13:46,138 INFO L87 Difference]: Start difference. First operand 196 states and 226 transitions. Second operand has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-05-06 09:13:46,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 09:13:46,334 INFO L93 Difference]: Finished difference Result 209 states and 242 transitions. [2021-05-06 09:13:46,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 09:13:46,335 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) Word has length 94 [2021-05-06 09:13:46,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 09:13:46,336 INFO L225 Difference]: With dead ends: 209 [2021-05-06 09:13:46,337 INFO L226 Difference]: Without dead ends: 196 [2021-05-06 09:13:46,337 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 73.5ms TimeCoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-05-06 09:13:46,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-05-06 09:13:46,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2021-05-06 09:13:46,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 130 states have (on average 1.1307692307692307) internal successors, (147), 134 states have internal predecessors, (147), 40 states have call successors, (40), 26 states have call predecessors, (40), 25 states have return successors, (36), 35 states have call predecessors, (36), 36 states have call successors, (36) [2021-05-06 09:13:46,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 223 transitions. [2021-05-06 09:13:46,347 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 223 transitions. Word has length 94 [2021-05-06 09:13:46,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 09:13:46,349 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 223 transitions. [2021-05-06 09:13:46,349 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-05-06 09:13:46,349 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 223 transitions. [2021-05-06 09:13:46,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-05-06 09:13:46,350 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 09:13:46,350 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 09:13:46,564 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-05-06 09:13:46,565 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 09:13:46,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 09:13:46,565 INFO L82 PathProgramCache]: Analyzing trace with hash -2090333941, now seen corresponding path program 3 times [2021-05-06 09:13:46,565 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 09:13:46,565 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1159383862] [2021-05-06 09:13:46,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 09:13:46,571 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 09:13:46,571 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [148301894] [2021-05-06 09:13:46,571 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 09:13:46,680 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-06 09:13:46,680 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 09:13:46,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 37 conjunts are in the unsatisfiable core [2021-05-06 09:13:46,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 09:13:46,907 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:46,919 INFO L134 CoverageAnalysis]: Checked inductivity of 368 backedges. 26 proven. 30 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2021-05-06 09:13:46,919 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 09:13:46,920 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1159383862] [2021-05-06 09:13:46,920 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 09:13:46,920 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [148301894] [2021-05-06 09:13:46,920 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [148301894] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 09:13:46,920 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 09:13:46,920 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-06 09:13:46,920 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43034284] [2021-05-06 09:13:46,920 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 09:13:46,920 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 09:13:46,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 09:13:46,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-05-06 09:13:46,921 INFO L87 Difference]: Start difference. First operand 196 states and 223 transitions. Second operand has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-05-06 09:13:47,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 09:13:47,089 INFO L93 Difference]: Finished difference Result 200 states and 226 transitions. [2021-05-06 09:13:47,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 09:13:47,089 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) Word has length 94 [2021-05-06 09:13:47,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 09:13:47,091 INFO L225 Difference]: With dead ends: 200 [2021-05-06 09:13:47,091 INFO L226 Difference]: Without dead ends: 179 [2021-05-06 09:13:47,091 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 92.7ms TimeCoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-05-06 09:13:47,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2021-05-06 09:13:47,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 179. [2021-05-06 09:13:47,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 118 states have (on average 1.1355932203389831) internal successors, (134), 121 states have internal predecessors, (134), 37 states have call successors, (37), 24 states have call predecessors, (37), 23 states have return successors, (34), 33 states have call predecessors, (34), 34 states have call successors, (34) [2021-05-06 09:13:47,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 205 transitions. [2021-05-06 09:13:47,097 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 205 transitions. Word has length 94 [2021-05-06 09:13:47,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 09:13:47,098 INFO L480 AbstractCegarLoop]: Abstraction has 179 states and 205 transitions. [2021-05-06 09:13:47,098 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-05-06 09:13:47,098 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 205 transitions. [2021-05-06 09:13:47,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-05-06 09:13:47,099 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 09:13:47,099 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 09:13:47,325 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-06 09:13:47,325 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 09:13:47,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 09:13:47,325 INFO L82 PathProgramCache]: Analyzing trace with hash -1880085295, now seen corresponding path program 1 times [2021-05-06 09:13:47,325 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 09:13:47,325 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [184733674] [2021-05-06 09:13:47,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 09:13:47,344 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 09:13:47,344 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1463370604] [2021-05-06 09:13:47,344 INFO L95 rtionOrderModulation]: Keeping assertion order 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 09:13:47,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 09:13:47,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-06 09:13:47,400 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 09:13:47,422 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:47,431 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:47,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:47,438 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:47,439 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:47,446 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:47,447 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:47,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:47,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:47,465 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:47,465 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:47,466 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:47,467 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:47,475 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:47,475 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:47,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:47,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:47,494 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:47,495 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:47,498 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:47,498 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:47,547 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:47,549 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:47,570 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:47,573 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:47,594 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:47,597 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:47,620 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:47,622 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:47,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:47,633 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:47,645 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:47,648 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 09:13:47,679 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 136 proven. 0 refuted. 0 times theorem prover too weak. 230 trivial. 0 not checked. [2021-05-06 09:13:47,679 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 09:13:47,679 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [184733674] [2021-05-06 09:13:47,679 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 09:13:47,679 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1463370604] [2021-05-06 09:13:47,679 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1463370604] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 09:13:47,680 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 09:13:47,680 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 09:13:47,680 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163995880] [2021-05-06 09:13:47,680 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 09:13:47,680 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 09:13:47,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 09:13:47,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 09:13:47,681 INFO L87 Difference]: Start difference. First operand 179 states and 205 transitions. Second operand has 6 states, 6 states have (on average 4.833333333333333) internal successors, (29), 6 states have internal predecessors, (29), 5 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-05-06 09:13:47,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 09:13:47,756 INFO L93 Difference]: Finished difference Result 155 states and 176 transitions. [2021-05-06 09:13:47,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 09:13:47,756 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.833333333333333) internal successors, (29), 6 states have internal predecessors, (29), 5 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) Word has length 94 [2021-05-06 09:13:47,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 09:13:47,757 INFO L225 Difference]: With dead ends: 155 [2021-05-06 09:13:47,758 INFO L226 Difference]: Without dead ends: 141 [2021-05-06 09:13:47,758 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 52.0ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-06 09:13:47,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-05-06 09:13:47,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 130. [2021-05-06 09:13:47,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 85 states have (on average 1.1058823529411765) internal successors, (94), 87 states have internal predecessors, (94), 26 states have call successors, (26), 19 states have call predecessors, (26), 18 states have return successors, (24), 23 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-06 09:13:47,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 144 transitions. [2021-05-06 09:13:47,763 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 144 transitions. Word has length 94 [2021-05-06 09:13:47,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 09:13:47,764 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 144 transitions. [2021-05-06 09:13:47,764 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.833333333333333) internal successors, (29), 6 states have internal predecessors, (29), 5 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-05-06 09:13:47,764 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 144 transitions. [2021-05-06 09:13:47,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-05-06 09:13:47,766 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 09:13:47,766 INFO L523 BasicCegarLoop]: trace histogram [15, 14, 14, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 09:13:47,984 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-06 09:13:47,985 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 09:13:47,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 09:13:47,985 INFO L82 PathProgramCache]: Analyzing trace with hash -952273693, now seen corresponding path program 4 times [2021-05-06 09:13:47,985 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 09:13:47,985 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1342001407] [2021-05-06 09:13:47,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 09:13:47,990 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 09:13:47,990 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [542349798] [2021-05-06 09:13:47,991 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 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 09:13:48,048 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 09:13:48,048 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2021-05-06 09:13:48,049 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-06 09:13:48,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-06 09:13:48,076 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-06 09:13:48,188 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-05-06 09:13:48,189 INFO L624 BasicCegarLoop]: Counterexample might be feasible [2021-05-06 09:13:48,389 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-05-06 09:13:48,448 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 09:13:48 BasicIcfg [2021-05-06 09:13:48,448 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-06 09:13:48,449 INFO L168 Benchmark]: Toolchain (without parser) took 13939.91 ms. Allocated memory was 208.7 MB in the beginning and 300.9 MB in the end (delta: 92.3 MB). Free memory was 175.1 MB in the beginning and 184.0 MB in the end (delta: -8.8 MB). Peak memory consumption was 84.1 MB. Max. memory is 8.0 GB. [2021-05-06 09:13:48,449 INFO L168 Benchmark]: CDTParser took 0.12 ms. Allocated memory is still 208.7 MB. Free memory was 191.6 MB in the beginning and 191.5 MB in the end (delta: 105.2 kB). There was no memory consumed. Max. memory is 8.0 GB. [2021-05-06 09:13:48,449 INFO L168 Benchmark]: CACSL2BoogieTranslator took 221.07 ms. Allocated memory is still 208.7 MB. Free memory was 174.9 MB in the beginning and 165.1 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-05-06 09:13:48,449 INFO L168 Benchmark]: Boogie Preprocessor took 41.98 ms. Allocated memory is still 208.7 MB. Free memory was 165.1 MB in the beginning and 163.5 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-06 09:13:48,449 INFO L168 Benchmark]: RCFGBuilder took 431.48 ms. Allocated memory is still 208.7 MB. Free memory was 163.5 MB in the beginning and 178.4 MB in the end (delta: -14.9 MB). Peak memory consumption was 3.3 MB. Max. memory is 8.0 GB. [2021-05-06 09:13:48,449 INFO L168 Benchmark]: IcfgTransformer took 17.26 ms. Allocated memory is still 208.7 MB. Free memory was 178.4 MB in the beginning and 177.1 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-05-06 09:13:48,451 INFO L168 Benchmark]: TraceAbstraction took 13220.00 ms. Allocated memory was 208.7 MB in the beginning and 300.9 MB in the end (delta: 92.3 MB). Free memory was 176.7 MB in the beginning and 184.0 MB in the end (delta: -7.2 MB). Peak memory consumption was 86.0 MB. Max. memory is 8.0 GB. [2021-05-06 09:13:48,452 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.12 ms. Allocated memory is still 208.7 MB. Free memory was 191.6 MB in the beginning and 191.5 MB in the end (delta: 105.2 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 221.07 ms. Allocated memory is still 208.7 MB. Free memory was 174.9 MB in the beginning and 165.1 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 41.98 ms. Allocated memory is still 208.7 MB. Free memory was 165.1 MB in the beginning and 163.5 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 431.48 ms. Allocated memory is still 208.7 MB. Free memory was 163.5 MB in the beginning and 178.4 MB in the end (delta: -14.9 MB). Peak memory consumption was 3.3 MB. Max. memory is 8.0 GB. * IcfgTransformer took 17.26 ms. Allocated memory is still 208.7 MB. Free memory was 178.4 MB in the beginning and 177.1 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * TraceAbstraction took 13220.00 ms. Allocated memory was 208.7 MB in the beginning and 300.9 MB in the end (delta: 92.3 MB). Free memory was 176.7 MB in the beginning and 184.0 MB in the end (delta: -7.2 MB). Peak memory consumption was 86.0 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 17]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L22] int counter = 0; VAL [\old(counter)=20, counter=0] [L24] int A, B; [L25] int r, d, p, q; [L26] A = __VERIFIER_nondet_int() [L27] B = 1 [L29] r = A [L30] d = B [L31] p = 1 [L32] q = 0 VAL [\old(counter)=0, A=4, B=1, counter=0, d=1, p=1, q=0, r=4] [L34] EXPR counter++ VAL [\old(counter)=0, A=4, B=1, counter=1, counter++=0, d=1, p=1, q=0, r=4] [L34] COND TRUE counter++<5 [L35] CALL __VERIFIER_assert(q == 0) VAL [\old(cond)=1, \old(counter)=0, counter=1] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=1] [L35] RET __VERIFIER_assert(q == 0) VAL [\old(counter)=0, A=4, B=1, counter=1, d=1, p=1, q=0, r=4] [L36] CALL __VERIFIER_assert(r == A) VAL [\old(cond)=1, \old(counter)=0, counter=1] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=1] [L36] RET __VERIFIER_assert(r == A) VAL [\old(counter)=0, A=4, B=1, counter=1, d=1, p=1, q=0, r=4] [L37] CALL __VERIFIER_assert(d == B * p) VAL [\old(cond)=1, \old(counter)=0, counter=1] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=1] [L37] RET __VERIFIER_assert(d == B * p) VAL [\old(counter)=0, A=4, B=1, counter=1, d=1, p=1, q=0, r=4] [L38] COND FALSE !(!(r >= d)) [L40] d = 2 * d [L41] p = 2 * p VAL [\old(counter)=0, A=4, B=1, counter=1, d=2, p=2, q=0, r=4] [L34] EXPR counter++ VAL [\old(counter)=0, A=4, B=1, counter=2, counter++=1, d=2, p=2, q=0, r=4] [L34] COND TRUE counter++<5 [L35] CALL __VERIFIER_assert(q == 0) VAL [\old(cond)=1, \old(counter)=0, counter=2] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=2] [L35] RET __VERIFIER_assert(q == 0) VAL [\old(counter)=0, A=4, B=1, counter=2, d=2, p=2, q=0, r=4] [L36] CALL __VERIFIER_assert(r == A) VAL [\old(cond)=1, \old(counter)=0, counter=2] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=2] [L36] RET __VERIFIER_assert(r == A) VAL [\old(counter)=0, A=4, B=1, counter=2, d=2, p=2, q=0, r=4] [L37] CALL __VERIFIER_assert(d == B * p) VAL [\old(cond)=1, \old(counter)=0, counter=2] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=2] [L37] RET __VERIFIER_assert(d == B * p) VAL [\old(counter)=0, A=4, B=1, counter=2, d=2, p=2, q=0, r=4] [L38] COND FALSE !(!(r >= d)) [L40] d = 2 * d [L41] p = 2 * p VAL [\old(counter)=0, A=4, B=1, counter=2, d=4, p=4, q=0, r=4] [L34] EXPR counter++ VAL [\old(counter)=0, A=4, B=1, counter=3, counter++=2, d=4, p=4, q=0, r=4] [L34] COND TRUE counter++<5 [L35] CALL __VERIFIER_assert(q == 0) VAL [\old(cond)=1, \old(counter)=0, counter=3] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=3] [L35] RET __VERIFIER_assert(q == 0) VAL [\old(counter)=0, A=4, B=1, counter=3, d=4, p=4, q=0, r=4] [L36] CALL __VERIFIER_assert(r == A) VAL [\old(cond)=1, \old(counter)=0, counter=3] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=3] [L36] RET __VERIFIER_assert(r == A) VAL [\old(counter)=0, A=4, B=1, counter=3, d=4, p=4, q=0, r=4] [L37] CALL __VERIFIER_assert(d == B * p) VAL [\old(cond)=1, \old(counter)=0, counter=3] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=3] [L37] RET __VERIFIER_assert(d == B * p) VAL [\old(counter)=0, A=4, B=1, counter=3, d=4, p=4, q=0, r=4] [L38] COND FALSE !(!(r >= d)) [L40] d = 2 * d [L41] p = 2 * p VAL [\old(counter)=0, A=4, B=1, counter=3, d=8, p=8, q=0, r=4] [L34] EXPR counter++ VAL [\old(counter)=0, A=4, B=1, counter=4, counter++=3, d=8, p=8, q=0, r=4] [L34] COND TRUE counter++<5 [L35] CALL __VERIFIER_assert(q == 0) VAL [\old(cond)=1, \old(counter)=0, counter=4] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=4] [L35] RET __VERIFIER_assert(q == 0) VAL [\old(counter)=0, A=4, B=1, counter=4, d=8, p=8, q=0, r=4] [L36] CALL __VERIFIER_assert(r == A) VAL [\old(cond)=1, \old(counter)=0, counter=4] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=4] [L36] RET __VERIFIER_assert(r == A) VAL [\old(counter)=0, A=4, B=1, counter=4, d=8, p=8, q=0, r=4] [L37] CALL __VERIFIER_assert(d == B * p) VAL [\old(cond)=1, \old(counter)=0, counter=4] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=4] [L37] RET __VERIFIER_assert(d == B * p) VAL [\old(counter)=0, A=4, B=1, counter=4, d=8, p=8, q=0, r=4] [L38] COND TRUE !(r >= d) VAL [\old(counter)=0, A=4, B=1, counter=4, d=8, p=8, q=0, r=4] [L44] EXPR counter++ VAL [\old(counter)=0, A=4, B=1, counter=5, counter++=4, d=8, p=8, q=0, r=4] [L44] COND TRUE counter++<5 [L45] CALL __VERIFIER_assert(A == q*B + r) VAL [\old(cond)=1, \old(counter)=0, counter=5] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=5] [L45] RET __VERIFIER_assert(A == q*B + r) VAL [\old(counter)=0, A=4, B=1, counter=5, d=8, p=8, q=0, r=4] [L46] CALL __VERIFIER_assert(d == B*p) VAL [\old(cond)=1, \old(counter)=0, counter=5] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=5] [L46] RET __VERIFIER_assert(d == B*p) VAL [\old(counter)=0, A=4, B=1, counter=5, d=8, p=8, q=0, r=4] [L48] COND FALSE !(!(p != 1)) [L50] d = d / 2 [L51] p = p / 2 VAL [\old(counter)=0, A=4, B=1, counter=5, d=4, p=4, q=0, r=4] [L52] COND TRUE r >= d [L53] r = r - d [L54] q = q + p VAL [\old(counter)=0, A=4, B=1, counter=5, d=4, p=4, q=4, r=0] [L44] EXPR counter++ VAL [\old(counter)=0, A=4, B=1, counter=6, counter++=5, d=4, p=4, q=4, r=0] [L44] COND FALSE !(counter++<5) [L58] CALL __VERIFIER_assert(A == d*q + r) VAL [\old(cond)=0, \old(counter)=0, counter=6] [L15] COND TRUE !(cond) VAL [\old(cond)=0, \old(counter)=0, cond=0, counter=6] [L17] reach_error() VAL [\old(cond)=0, \old(counter)=0, cond=0, counter=6] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 31 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 13117.4ms, OverallIterations: 24, TraceHistogramMax: 15, EmptinessCheckTime: 37.9ms, AutomataDifference: 3002.9ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 7.7ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 1009 SDtfs, 279 SDslu, 3292 SDs, 0 SdLazy, 1933 SolverSat, 218 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1670.6ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1244 GetRequests, 1103 SyntacticMatches, 0 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 1375.8ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=196occurred in iteration=20, InterpolantAutomatonStates: 170, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 236.5ms AutomataMinimizationTime, 23 MinimizatonAttempts, 53 StatesRemovedByMinimization, 14 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 179.1ms SsaConstructionTime, 651.2ms SatisfiabilityAnalysisTime, 3600.4ms InterpolantComputationTime, 1357 NumberOfCodeBlocks, 1253 NumberOfCodeBlocksAsserted, 41 NumberOfCheckSat, 1236 ConstructedInterpolants, 0 QuantifiedInterpolants, 5168 SizeOfPredicates, 50 NumberOfNonLiveVariables, 3867 ConjunctsInSsa, 307 ConjunctsInUnsatCore, 23 InterpolantComputations, 8 PerfectInterpolantSequences, 2580/3481 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...