/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/dijkstra-u_unwindbound5.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 07:28:10,563 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 07:28:10,565 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 07:28:10,602 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-06 07:28:10,602 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-06 07:28:10,607 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-06 07:28:10,609 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-06 07:28:10,614 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-06 07:28:10,616 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-06 07:28:10,620 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-06 07:28:10,620 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-06 07:28:10,622 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-06 07:28:10,622 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 07:28:10,624 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 07:28:10,625 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 07:28:10,627 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 07:28:10,629 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 07:28:10,630 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 07:28:10,632 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 07:28:10,637 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 07:28:10,638 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 07:28:10,639 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 07:28:10,640 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 07:28:10,642 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 07:28:10,648 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 07:28:10,656 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 07:28:10,656 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 07:28:10,670 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 07:28:10,674 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-06 07:28:10,689 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 07:28:10,690 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 07:28:10,692 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 07:28:10,692 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 07:28:10,692 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 07:28:10,693 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 07:28:10,693 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 07:28:10,693 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 07:28:10,693 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 07:28:10,693 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 07:28:10,694 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 07:28:10,694 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 07:28:10,694 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 07:28:10,694 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 07:28:10,695 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 07:28:10,695 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 07:28:10,695 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 07:28:10,695 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 07:28:10,695 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 07:28:10,695 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 07:28:10,695 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 07:28:10,696 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-06 07:28:10,696 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 07:28:10,999 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 07:28:11,023 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 07:28:11,026 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 07:28:11,026 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 07:28:11,027 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 07:28:11,028 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/dijkstra-u_unwindbound5.c [2021-05-06 07:28:11,089 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7fc751951/88be8a04a3dc47a98433c6d5b28744f9/FLAGd75bd3150 [2021-05-06 07:28:11,455 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 07:28:11,455 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/dijkstra-u_unwindbound5.c [2021-05-06 07:28:11,462 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7fc751951/88be8a04a3dc47a98433c6d5b28744f9/FLAGd75bd3150 [2021-05-06 07:28:11,841 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7fc751951/88be8a04a3dc47a98433c6d5b28744f9 [2021-05-06 07:28:11,843 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 07:28:11,844 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-06 07:28:11,848 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 07:28:11,848 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 07:28:11,850 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 07:28:11,851 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 07:28:11" (1/1) ... [2021-05-06 07:28:11,852 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5bdc748b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:28:11, skipping insertion in model container [2021-05-06 07:28:11,852 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 07:28:11" (1/1) ... [2021-05-06 07:28:11,858 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 07:28:11,876 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 07:28:11,976 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/dijkstra-u_unwindbound5.c[533,546] [2021-05-06 07:28:11,998 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 07:28:12,005 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 07:28:12,047 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/dijkstra-u_unwindbound5.c[533,546] [2021-05-06 07:28:12,080 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 07:28:12,090 INFO L208 MainTranslator]: Completed translation [2021-05-06 07:28:12,090 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:28:12 WrapperNode [2021-05-06 07:28:12,091 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 07:28:12,091 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 07:28:12,091 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 07:28:12,092 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 07:28:12,109 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:28:12" (1/1) ... [2021-05-06 07:28:12,110 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:28:12" (1/1) ... [2021-05-06 07:28:12,125 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:28:12" (1/1) ... [2021-05-06 07:28:12,125 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:28:12" (1/1) ... [2021-05-06 07:28:12,136 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:28:12" (1/1) ... [2021-05-06 07:28:12,139 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:28:12" (1/1) ... [2021-05-06 07:28:12,141 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:28:12" (1/1) ... [2021-05-06 07:28:12,142 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 07:28:12,143 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 07:28:12,143 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 07:28:12,143 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 07:28:12,143 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:28:12" (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 07:28:12,213 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 07:28:12,214 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 07:28:12,214 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 07:28:12,214 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 07:28:12,214 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 07:28:12,214 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 07:28:12,215 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 07:28:12,215 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 07:28:12,215 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 07:28:12,215 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 07:28:12,215 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_int [2021-05-06 07:28:12,216 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 07:28:12,216 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 07:28:12,216 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 07:28:12,216 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 07:28:12,217 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 07:28:12,217 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 07:28:12,217 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 07:28:12,217 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 07:28:12,218 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 07:28:12,528 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 07:28:12,529 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-06 07:28:12,530 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 07:28:12 BoogieIcfgContainer [2021-05-06 07:28:12,530 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 07:28:12,530 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-06 07:28:12,530 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-06 07:28:12,531 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-06 07:28:12,533 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 07:28:12" (1/1) ... [2021-05-06 07:28:12,545 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 07:28:12 BasicIcfg [2021-05-06 07:28:12,545 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-06 07:28:12,546 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 07:28:12,546 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 07:28:12,549 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 07:28:12,549 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 07:28:11" (1/4) ... [2021-05-06 07:28:12,549 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@76dad7a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 07:28:12, skipping insertion in model container [2021-05-06 07:28:12,550 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 07:28:12" (2/4) ... [2021-05-06 07:28:12,550 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@76dad7a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 07:28:12, skipping insertion in model container [2021-05-06 07:28:12,550 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 07:28:12" (3/4) ... [2021-05-06 07:28:12,550 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@76dad7a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 07:28:12, skipping insertion in model container [2021-05-06 07:28:12,550 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 07:28:12" (4/4) ... [2021-05-06 07:28:12,551 INFO L111 eAbstractionObserver]: Analyzing ICFG dijkstra-u_unwindbound5.cJordan [2021-05-06 07:28:12,572 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-06 07:28:12,575 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 07:28:12,592 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 07:28:12,623 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 07:28:12,623 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-06 07:28:12,623 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-06 07:28:12,623 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 07:28:12,623 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 07:28:12,623 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 07:28:12,623 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 07:28:12,623 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 07:28:12,634 INFO L276 IsEmpty]: Start isEmpty. Operand has 39 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-06 07:28:12,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-06 07:28:12,640 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:28:12,640 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:28:12,640 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:28:12,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:28:12,645 INFO L82 PathProgramCache]: Analyzing trace with hash -460462115, now seen corresponding path program 1 times [2021-05-06 07:28:12,651 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:28:12,651 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [451675097] [2021-05-06 07:28:12,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:28:12,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:28:12,882 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 07:28:12,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:28:12,906 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 07:28:12,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:28:12,916 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 07:28:12,917 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:28:12,917 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [451675097] [2021-05-06 07:28:12,918 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [451675097] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 07:28:12,918 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 07:28:12,918 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 07:28:12,919 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [291601910] [2021-05-06 07:28:12,922 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 07:28:12,922 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:28:12,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 07:28:12,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 07:28:12,934 INFO L87 Difference]: Start difference. First operand has 39 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 07:28:13,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:28:13,286 INFO L93 Difference]: Finished difference Result 40 states and 52 transitions. [2021-05-06 07:28:13,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 07:28:13,288 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2021-05-06 07:28:13,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:28:13,295 INFO L225 Difference]: With dead ends: 40 [2021-05-06 07:28:13,295 INFO L226 Difference]: Without dead ends: 35 [2021-05-06 07:28:13,297 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 58.2ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 07:28:13,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-06 07:28:13,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2021-05-06 07:28:13,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 07:28:13,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 46 transitions. [2021-05-06 07:28:13,336 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 46 transitions. Word has length 18 [2021-05-06 07:28:13,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:28:13,336 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 46 transitions. [2021-05-06 07:28:13,336 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 07:28:13,336 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 46 transitions. [2021-05-06 07:28:13,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-06 07:28:13,337 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:28:13,337 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:28:13,337 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 07:28:13,338 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:28:13,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:28:13,338 INFO L82 PathProgramCache]: Analyzing trace with hash -889932734, now seen corresponding path program 1 times [2021-05-06 07:28:13,339 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:28:13,339 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [994008420] [2021-05-06 07:28:13,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:28:13,356 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:28:13,356 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1606117419] [2021-05-06 07:28:13,356 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 07:28:13,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:28:13,412 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-06 07:28:13,416 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:28:13,449 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:28:13,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:28:13,456 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:28:13,486 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:28:13,495 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:28:13,528 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 07:28:13,529 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:28:13,529 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [994008420] [2021-05-06 07:28:13,529 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:28:13,529 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1606117419] [2021-05-06 07:28:13,529 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1606117419] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 07:28:13,529 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 07:28:13,529 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 07:28:13,530 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [254464251] [2021-05-06 07:28:13,531 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 07:28:13,531 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:28:13,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 07:28:13,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 07:28:13,532 INFO L87 Difference]: Start difference. First operand 34 states and 46 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 07:28:13,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:28:13,564 INFO L93 Difference]: Finished difference Result 36 states and 48 transitions. [2021-05-06 07:28:13,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 07:28:13,564 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-05-06 07:28:13,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:28:13,565 INFO L225 Difference]: With dead ends: 36 [2021-05-06 07:28:13,566 INFO L226 Difference]: Without dead ends: 36 [2021-05-06 07:28:13,566 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.2ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 07:28:13,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-06 07:28:13,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-05-06 07:28:13,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 20 states have (on average 1.3) internal successors, (26), 21 states have internal predecessors, (26), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 07:28:13,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 48 transitions. [2021-05-06 07:28:13,572 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 48 transitions. Word has length 20 [2021-05-06 07:28:13,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:28:13,572 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 48 transitions. [2021-05-06 07:28:13,572 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 07:28:13,572 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 48 transitions. [2021-05-06 07:28:13,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-06 07:28:13,573 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:28:13,573 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:28:13,774 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-06 07:28:13,774 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:28:13,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:28:13,775 INFO L82 PathProgramCache]: Analyzing trace with hash 1699853977, now seen corresponding path program 1 times [2021-05-06 07:28:13,775 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:28:13,775 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1767010030] [2021-05-06 07:28:13,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:28:13,788 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 07:28:13,789 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [120034949] [2021-05-06 07:28:13,789 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 07:28:13,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:28:13,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 07:28:13,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 07:28:13,869 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:28:13,877 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:28:13,879 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:28:13,904 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:28:13,909 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:28:13,910 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:28:13,930 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:28:13,935 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 07:28:13,956 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 07:28:13,956 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:28:13,957 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1767010030] [2021-05-06 07:28:13,957 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 07:28:13,957 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [120034949] [2021-05-06 07:28:13,957 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [120034949] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 07:28:13,957 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 07:28:13,957 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 07:28:13,957 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [539485161] [2021-05-06 07:28:13,958 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 07:28:13,958 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:28:13,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 07:28:13,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 07:28:13,959 INFO L87 Difference]: Start difference. First operand 36 states and 48 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 07:28:13,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 07:28:13,988 INFO L93 Difference]: Finished difference Result 40 states and 53 transitions. [2021-05-06 07:28:13,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 07:28:13,989 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2021-05-06 07:28:13,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 07:28:13,990 INFO L225 Difference]: With dead ends: 40 [2021-05-06 07:28:13,990 INFO L226 Difference]: Without dead ends: 40 [2021-05-06 07:28:13,990 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 13.4ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 07:28:13,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-06 07:28:13,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2021-05-06 07:28:13,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 24 states have internal predecessors, (30), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 07:28:13,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 52 transitions. [2021-05-06 07:28:13,997 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 52 transitions. Word has length 21 [2021-05-06 07:28:13,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 07:28:13,997 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 52 transitions. [2021-05-06 07:28:13,997 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 07:28:13,997 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 52 transitions. [2021-05-06 07:28:13,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-06 07:28:13,998 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 07:28:13,998 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 07:28:14,219 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 07:28:14,219 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 07:28:14,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 07:28:14,220 INFO L82 PathProgramCache]: Analyzing trace with hash 1700986035, now seen corresponding path program 1 times [2021-05-06 07:28:14,220 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 07:28:14,220 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [49464427] [2021-05-06 07:28:14,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 07:28:14,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:28:14,528 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 07:28:14,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:28:14,560 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 07:28:14,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 07:28:14,565 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 07:28:14,565 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 07:28:14,565 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [49464427] [2021-05-06 07:28:14,565 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [49464427] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 07:28:14,565 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 07:28:14,566 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-06 07:28:14,566 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [145109659] [2021-05-06 07:28:14,566 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 07:28:14,566 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 07:28:14,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 07:28:14,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-06 07:28:14,567 INFO L87 Difference]: Start difference. First operand 39 states and 52 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2)