/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/hard-ll_unwindbound50.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 08:50:11,904 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 08:50:11,907 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 08:50:11,944 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-06 08:50:11,944 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-06 08:50:11,946 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-06 08:50:11,949 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-06 08:50:11,952 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-06 08:50:11,954 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-06 08:50:11,957 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-06 08:50:11,958 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-06 08:50:11,958 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-06 08:50:11,959 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 08:50:11,960 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 08:50:11,961 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 08:50:11,962 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 08:50:11,964 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 08:50:11,964 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 08:50:11,966 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 08:50:11,987 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 08:50:11,988 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 08:50:11,988 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 08:50:11,990 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 08:50:11,992 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 08:50:11,993 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 08:50:11,997 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 08:50:11,998 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 08:50:11,998 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 08:50:12,011 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-06 08:50:12,024 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 08:50:12,024 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 08:50:12,026 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 08:50:12,026 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 08:50:12,026 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 08:50:12,026 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 08:50:12,027 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 08:50:12,027 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 08:50:12,027 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 08:50:12,027 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 08:50:12,027 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 08:50:12,028 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 08:50:12,028 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 08:50:12,028 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 08:50:12,028 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 08:50:12,028 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 08:50:12,028 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 08:50:12,028 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 08:50:12,028 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 08:50:12,029 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 08:50:12,029 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 08:50:12,029 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-06 08:50:12,030 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 08:50:12,332 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 08:50:12,349 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 08:50:12,351 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 08:50:12,351 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 08:50:12,352 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 08:50:12,352 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/hard-ll_unwindbound50.c [2021-05-06 08:50:12,405 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/13c37c140/fd7a0916b07346ab9ad88df9617dacaa/FLAG0baacbe8a [2021-05-06 08:50:12,768 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 08:50:12,768 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard-ll_unwindbound50.c [2021-05-06 08:50:12,773 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/13c37c140/fd7a0916b07346ab9ad88df9617dacaa/FLAG0baacbe8a [2021-05-06 08:50:12,787 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/13c37c140/fd7a0916b07346ab9ad88df9617dacaa [2021-05-06 08:50:12,788 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 08:50:12,790 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-06 08:50:12,794 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 08:50:12,794 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 08:50:12,797 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 08:50:12,797 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 08:50:12" (1/1) ... [2021-05-06 08:50:12,798 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@11f678e8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 08:50:12, skipping insertion in model container [2021-05-06 08:50:12,798 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 08:50:12" (1/1) ... [2021-05-06 08:50:12,803 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 08:50:12,814 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 08:50:12,931 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/hard-ll_unwindbound50.c[546,559] [2021-05-06 08:50:12,946 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 08:50:12,952 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 08:50:12,971 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/hard-ll_unwindbound50.c[546,559] [2021-05-06 08:50:12,999 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 08:50:13,009 INFO L208 MainTranslator]: Completed translation [2021-05-06 08:50:13,010 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 08:50:13 WrapperNode [2021-05-06 08:50:13,010 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 08:50:13,011 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 08:50:13,011 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 08:50:13,011 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 08:50:13,017 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 08:50:13" (1/1) ... [2021-05-06 08:50:13,018 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 08:50:13" (1/1) ... [2021-05-06 08:50:13,022 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 08:50:13" (1/1) ... [2021-05-06 08:50:13,022 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 08:50:13" (1/1) ... [2021-05-06 08:50:13,025 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 08:50:13" (1/1) ... [2021-05-06 08:50:13,027 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 08:50:13" (1/1) ... [2021-05-06 08:50:13,028 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 08:50:13" (1/1) ... [2021-05-06 08:50:13,029 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 08:50:13,030 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 08:50:13,030 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 08:50:13,030 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 08:50:13,031 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 08:50:13" (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 08:50:13,111 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 08:50:13,111 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 08:50:13,111 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 08:50:13,111 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 08:50:13,112 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 08:50:13,112 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 08:50:13,112 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 08:50:13,112 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 08:50:13,112 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 08:50:13,113 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 08:50:13,113 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_int [2021-05-06 08:50:13,113 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 08:50:13,113 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 08:50:13,113 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 08:50:13,113 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 08:50:13,113 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 08:50:13,114 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 08:50:13,114 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 08:50:13,114 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 08:50:13,114 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 08:50:13,355 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 08:50:13,355 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-06 08:50:13,356 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 08:50:13 BoogieIcfgContainer [2021-05-06 08:50:13,356 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 08:50:13,357 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-06 08:50:13,357 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-06 08:50:13,357 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-06 08:50:13,359 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 08:50:13" (1/1) ... [2021-05-06 08:50:13,383 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 08:50:13 BasicIcfg [2021-05-06 08:50:13,383 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-06 08:50:13,384 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 08:50:13,385 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 08:50:13,386 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 08:50:13,386 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 08:50:12" (1/4) ... [2021-05-06 08:50:13,387 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c9a237 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 08:50:13, skipping insertion in model container [2021-05-06 08:50:13,387 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 08:50:13" (2/4) ... [2021-05-06 08:50:13,387 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c9a237 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 08:50:13, skipping insertion in model container [2021-05-06 08:50:13,387 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 08:50:13" (3/4) ... [2021-05-06 08:50:13,387 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c9a237 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 08:50:13, skipping insertion in model container [2021-05-06 08:50:13,388 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 08:50:13" (4/4) ... [2021-05-06 08:50:13,388 INFO L111 eAbstractionObserver]: Analyzing ICFG hard-ll_unwindbound50.cJordan [2021-05-06 08:50:13,391 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-06 08:50:13,394 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 08:50:13,411 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 08:50:13,423 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 08:50:13,423 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-06 08:50:13,423 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-06 08:50:13,423 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 08:50:13,423 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 08:50:13,423 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 08:50:13,423 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 08:50:13,423 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 08:50:13,435 INFO L276 IsEmpty]: Start isEmpty. Operand has 37 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 08:50:13,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-06 08:50:13,440 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:13,440 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 08:50:13,441 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:13,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:13,450 INFO L82 PathProgramCache]: Analyzing trace with hash 79654685, now seen corresponding path program 1 times [2021-05-06 08:50:13,455 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:13,455 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1618352486] [2021-05-06 08:50:13,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:13,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:50:13,639 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 08:50:13,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:50:13,660 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 08:50:13,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:50:13,665 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 08:50:13,665 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:13,665 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1618352486] [2021-05-06 08:50:13,666 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1618352486] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 08:50:13,666 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 08:50:13,666 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 08:50:13,667 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [458878737] [2021-05-06 08:50:13,677 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 08:50:13,677 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:13,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 08:50:13,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 08:50:13,690 INFO L87 Difference]: Start difference. First operand has 37 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) 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 08:50:13,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:13,833 INFO L93 Difference]: Finished difference Result 38 states and 48 transitions. [2021-05-06 08:50:13,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 08:50:13,834 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 08:50:13,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:13,839 INFO L225 Difference]: With dead ends: 38 [2021-05-06 08:50:13,839 INFO L226 Difference]: Without dead ends: 33 [2021-05-06 08:50:13,840 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 47.6ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 08:50:13,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-06 08:50:13,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2021-05-06 08:50:13,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 08:50:13,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 42 transitions. [2021-05-06 08:50:13,865 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 42 transitions. Word has length 18 [2021-05-06 08:50:13,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:13,866 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 42 transitions. [2021-05-06 08:50:13,866 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 08:50:13,866 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 42 transitions. [2021-05-06 08:50:13,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-06 08:50:13,866 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:13,866 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 08:50:13,867 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 08:50:13,867 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:13,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:13,868 INFO L82 PathProgramCache]: Analyzing trace with hash -85369733, now seen corresponding path program 1 times [2021-05-06 08:50:13,868 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:13,868 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1062531564] [2021-05-06 08:50:13,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:13,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:50:13,982 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 08:50:13,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:50:14,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 08:50:14,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:50:14,011 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 08:50:14,011 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:14,011 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1062531564] [2021-05-06 08:50:14,012 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1062531564] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 08:50:14,012 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 08:50:14,012 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 08:50:14,012 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784947660] [2021-05-06 08:50:14,013 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 08:50:14,014 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:14,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 08:50:14,015 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 08:50:14,015 INFO L87 Difference]: Start difference. First operand 32 states and 42 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 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) [2021-05-06 08:50:14,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:14,244 INFO L93 Difference]: Finished difference Result 45 states and 60 transitions. [2021-05-06 08:50:14,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 08:50:14,245 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 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) Word has length 18 [2021-05-06 08:50:14,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:14,247 INFO L225 Difference]: With dead ends: 45 [2021-05-06 08:50:14,247 INFO L226 Difference]: Without dead ends: 45 [2021-05-06 08:50:14,247 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 116.3ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-06 08:50:14,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-06 08:50:14,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 36. [2021-05-06 08:50:14,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 22 states have internal predecessors, (27), 10 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 08:50:14,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 45 transitions. [2021-05-06 08:50:14,263 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 45 transitions. Word has length 18 [2021-05-06 08:50:14,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:14,263 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 45 transitions. [2021-05-06 08:50:14,264 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 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) [2021-05-06 08:50:14,264 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 45 transitions. [2021-05-06 08:50:14,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-06 08:50:14,264 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:14,265 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 08:50:14,265 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 08:50:14,265 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:14,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:14,265 INFO L82 PathProgramCache]: Analyzing trace with hash -1527809342, now seen corresponding path program 1 times [2021-05-06 08:50:14,265 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:14,266 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1342878472] [2021-05-06 08:50:14,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:14,277 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:50:14,277 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1494574871] [2021-05-06 08:50:14,277 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 08:50:14,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:50:14,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-06 08:50:14,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:50:14,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:14,400 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:14,401 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:14,442 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:14,444 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:14,459 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 08:50:14,459 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:14,459 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1342878472] [2021-05-06 08:50:14,460 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:50:14,460 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1494574871] [2021-05-06 08:50:14,460 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1494574871] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 08:50:14,460 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 08:50:14,460 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 08:50:14,460 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1603248648] [2021-05-06 08:50:14,460 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 08:50:14,461 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:14,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 08:50:14,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 08:50:14,461 INFO L87 Difference]: Start difference. First operand 36 states and 45 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 08:50:14,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:14,484 INFO L93 Difference]: Finished difference Result 38 states and 47 transitions. [2021-05-06 08:50:14,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 08:50:14,484 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 08:50:14,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:14,485 INFO L225 Difference]: With dead ends: 38 [2021-05-06 08:50:14,485 INFO L226 Difference]: Without dead ends: 38 [2021-05-06 08:50:14,485 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.6ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 08:50:14,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-06 08:50:14,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-05-06 08:50:14,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 24 states have internal predecessors, (29), 10 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 08:50:14,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 47 transitions. [2021-05-06 08:50:14,489 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 47 transitions. Word has length 20 [2021-05-06 08:50:14,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:14,489 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 47 transitions. [2021-05-06 08:50:14,489 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 08:50:14,489 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 47 transitions. [2021-05-06 08:50:14,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-06 08:50:14,489 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:14,489 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 08:50:14,690 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-06 08:50:14,690 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:14,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:14,691 INFO L82 PathProgramCache]: Analyzing trace with hash 2128444854, now seen corresponding path program 1 times [2021-05-06 08:50:14,691 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:14,691 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1957559872] [2021-05-06 08:50:14,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:14,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:50:14,766 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 08:50:14,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:50:14,773 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 08:50:14,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:50:14,776 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-05-06 08:50:14,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:50:14,780 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 08:50:14,781 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:14,781 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1957559872] [2021-05-06 08:50:14,781 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1957559872] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 08:50:14,781 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 08:50:14,786 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 08:50:14,786 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [925336932] [2021-05-06 08:50:14,787 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 08:50:14,787 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:14,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 08:50:14,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 08:50:14,787 INFO L87 Difference]: Start difference. First operand 38 states and 47 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 3 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 08:50:15,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:15,023 INFO L93 Difference]: Finished difference Result 50 states and 64 transitions. [2021-05-06 08:50:15,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 08:50:15,023 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 3 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 23 [2021-05-06 08:50:15,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:15,026 INFO L225 Difference]: With dead ends: 50 [2021-05-06 08:50:15,026 INFO L226 Difference]: Without dead ends: 50 [2021-05-06 08:50:15,027 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 142.9ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-06 08:50:15,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-06 08:50:15,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 42. [2021-05-06 08:50:15,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 27 states have internal predecessors, (32), 10 states have call successors, (10), 6 states have call predecessors, (10), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 08:50:15,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2021-05-06 08:50:15,034 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 23 [2021-05-06 08:50:15,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:15,035 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2021-05-06 08:50:15,035 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 3 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 08:50:15,035 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2021-05-06 08:50:15,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-06 08:50:15,035 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:15,035 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 08:50:15,036 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-06 08:50:15,036 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:15,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:15,036 INFO L82 PathProgramCache]: Analyzing trace with hash 135546551, now seen corresponding path program 1 times [2021-05-06 08:50:15,036 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:15,036 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [912585297] [2021-05-06 08:50:15,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:15,043 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:50:15,044 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [34582748] [2021-05-06 08:50:15,044 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 08:50:15,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:50:15,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 08:50:15,099 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:50:15,163 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:15,170 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 08:50:15,170 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:15,170 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [912585297] [2021-05-06 08:50:15,171 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:50:15,171 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [34582748] [2021-05-06 08:50:15,171 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [34582748] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 08:50:15,171 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 08:50:15,171 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 08:50:15,171 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800330492] [2021-05-06 08:50:15,171 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 08:50:15,171 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:15,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 08:50:15,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 08:50:15,172 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 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 08:50:15,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:15,229 INFO L93 Difference]: Finished difference Result 57 states and 72 transitions. [2021-05-06 08:50:15,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 08:50:15,230 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), 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 28 [2021-05-06 08:50:15,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:15,233 INFO L225 Difference]: With dead ends: 57 [2021-05-06 08:50:15,233 INFO L226 Difference]: Without dead ends: 56 [2021-05-06 08:50:15,237 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 16.9ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 08:50:15,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-06 08:50:15,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-05-06 08:50:15,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 35 states have internal predecessors, (41), 16 states have call successors, (16), 7 states have call predecessors, (16), 6 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-06 08:50:15,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 70 transitions. [2021-05-06 08:50:15,246 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 70 transitions. Word has length 28 [2021-05-06 08:50:15,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:15,247 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 70 transitions. [2021-05-06 08:50:15,247 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), 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 08:50:15,247 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 70 transitions. [2021-05-06 08:50:15,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-06 08:50:15,247 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:15,247 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, 1, 1, 1, 1, 1, 1] [2021-05-06 08:50:15,464 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:50:15,465 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:15,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:15,465 INFO L82 PathProgramCache]: Analyzing trace with hash 1016025214, now seen corresponding path program 1 times [2021-05-06 08:50:15,465 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:15,466 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1674162824] [2021-05-06 08:50:15,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:15,471 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:50:15,471 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1638583986] [2021-05-06 08:50:15,472 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 08:50:15,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:50:15,525 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 08:50:15,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:50:15,540 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:15,545 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:15,548 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:15,581 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:15,585 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:15,586 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:15,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:15,629 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:15,638 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 08:50:15,638 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:15,638 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1674162824] [2021-05-06 08:50:15,639 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:50:15,639 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1638583986] [2021-05-06 08:50:15,639 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1638583986] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 08:50:15,639 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 08:50:15,639 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 08:50:15,639 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1175632208] [2021-05-06 08:50:15,640 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 08:50:15,640 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:15,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 08:50:15,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 08:50:15,640 INFO L87 Difference]: Start difference. First operand 56 states and 70 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), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-06 08:50:15,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:15,674 INFO L93 Difference]: Finished difference Result 69 states and 79 transitions. [2021-05-06 08:50:15,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 08:50:15,675 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), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 36 [2021-05-06 08:50:15,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:15,675 INFO L225 Difference]: With dead ends: 69 [2021-05-06 08:50:15,675 INFO L226 Difference]: Without dead ends: 69 [2021-05-06 08:50:15,676 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 6.5ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 08:50:15,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-06 08:50:15,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2021-05-06 08:50:15,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 42 states have (on average 1.1666666666666667) internal successors, (49), 44 states have internal predecessors, (49), 16 states have call successors, (16), 10 states have call predecessors, (16), 9 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-06 08:50:15,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 78 transitions. [2021-05-06 08:50:15,679 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 78 transitions. Word has length 36 [2021-05-06 08:50:15,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:15,679 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 78 transitions. [2021-05-06 08:50:15,679 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), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-06 08:50:15,680 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 78 transitions. [2021-05-06 08:50:15,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-06 08:50:15,680 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:15,680 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, 1, 1, 1, 1, 1, 1] [2021-05-06 08:50:15,892 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:50:15,895 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:15,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:15,895 INFO L82 PathProgramCache]: Analyzing trace with hash 1017127481, now seen corresponding path program 1 times [2021-05-06 08:50:15,895 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:15,895 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1492508005] [2021-05-06 08:50:15,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:15,901 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:50:15,902 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [736757565] [2021-05-06 08:50:15,902 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 08:50:15,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:50:15,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 08:50:15,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:50:15,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:15,982 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:15,992 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:15,994 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:16,004 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:16,006 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:16,015 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:16,032 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:16,034 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:16,041 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:16,049 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 08:50:16,049 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:16,049 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1492508005] [2021-05-06 08:50:16,049 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:50:16,049 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [736757565] [2021-05-06 08:50:16,049 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [736757565] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 08:50:16,050 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 08:50:16,050 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 08:50:16,050 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [441939672] [2021-05-06 08:50:16,050 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 08:50:16,050 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:16,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 08:50:16,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 08:50:16,051 INFO L87 Difference]: Start difference. First operand 68 states and 78 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-06 08:50:16,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:16,110 INFO L93 Difference]: Finished difference Result 72 states and 81 transitions. [2021-05-06 08:50:16,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 08:50:16,110 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 36 [2021-05-06 08:50:16,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:16,111 INFO L225 Difference]: With dead ends: 72 [2021-05-06 08:50:16,113 INFO L226 Difference]: Without dead ends: 58 [2021-05-06 08:50:16,114 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 32.4ms TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-06 08:50:16,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-05-06 08:50:16,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2021-05-06 08:50:16,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 36 states have (on average 1.1666666666666667) internal successors, (42), 37 states have internal predecessors, (42), 13 states have call successors, (13), 9 states have call predecessors, (13), 8 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-06 08:50:16,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 66 transitions. [2021-05-06 08:50:16,123 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 66 transitions. Word has length 36 [2021-05-06 08:50:16,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:16,124 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 66 transitions. [2021-05-06 08:50:16,124 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-06 08:50:16,124 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 66 transitions. [2021-05-06 08:50:16,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-06 08:50:16,128 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:16,128 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 08:50:16,344 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:50:16,344 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:16,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:16,345 INFO L82 PathProgramCache]: Analyzing trace with hash 1880362404, now seen corresponding path program 1 times [2021-05-06 08:50:16,345 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:16,345 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [47093002] [2021-05-06 08:50:16,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:16,350 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:50:16,351 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [292073527] [2021-05-06 08:50:16,351 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 08:50:16,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:50:16,400 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 08:50:16,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:50:16,411 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:16,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:16,417 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:16,427 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:16,429 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:16,430 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:16,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:16,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:16,464 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-06 08:50:16,464 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:16,465 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [47093002] [2021-05-06 08:50:16,465 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:50:16,465 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [292073527] [2021-05-06 08:50:16,465 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [292073527] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 08:50:16,465 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 08:50:16,465 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-06 08:50:16,465 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249700804] [2021-05-06 08:50:16,465 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 08:50:16,465 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:16,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 08:50:16,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 08:50:16,466 INFO L87 Difference]: Start difference. First operand 58 states and 66 transitions. Second operand has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-06 08:50:16,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:16,494 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2021-05-06 08:50:16,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 08:50:16,494 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 38 [2021-05-06 08:50:16,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:16,495 INFO L225 Difference]: With dead ends: 60 [2021-05-06 08:50:16,495 INFO L226 Difference]: Without dead ends: 60 [2021-05-06 08:50:16,495 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 11.1ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 08:50:16,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-06 08:50:16,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-05-06 08:50:16,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 38 states have (on average 1.1578947368421053) internal successors, (44), 39 states have internal predecessors, (44), 13 states have call successors, (13), 9 states have call predecessors, (13), 8 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-06 08:50:16,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 68 transitions. [2021-05-06 08:50:16,498 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 68 transitions. Word has length 38 [2021-05-06 08:50:16,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:16,498 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 68 transitions. [2021-05-06 08:50:16,498 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-06 08:50:16,498 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 68 transitions. [2021-05-06 08:50:16,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-06 08:50:16,498 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:16,498 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, 1, 1, 1, 1, 1, 1] [2021-05-06 08:50:16,715 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:50:16,715 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:16,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:16,716 INFO L82 PathProgramCache]: Analyzing trace with hash 1525733273, now seen corresponding path program 1 times [2021-05-06 08:50:16,716 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:16,716 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [362476323] [2021-05-06 08:50:16,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:16,733 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:50:16,733 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [235953440] [2021-05-06 08:50:16,733 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 08:50:16,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:50:16,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-06 08:50:16,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:50:16,840 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:16,843 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:16,857 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:16,861 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:16,881 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:16,883 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:16,913 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:16,914 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:16,923 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:16,924 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:16,932 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:16,934 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:16,941 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:16,949 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 08:50:16,949 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:16,949 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [362476323] [2021-05-06 08:50:16,949 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:50:16,950 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [235953440] [2021-05-06 08:50:16,950 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [235953440] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 08:50:16,950 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 08:50:16,950 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-06 08:50:16,950 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [433306145] [2021-05-06 08:50:16,950 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 08:50:16,950 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:16,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 08:50:16,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-06 08:50:16,951 INFO L87 Difference]: Start difference. First operand 60 states and 68 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-06 08:50:17,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:17,078 INFO L93 Difference]: Finished difference Result 83 states and 103 transitions. [2021-05-06 08:50:17,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 08:50:17,078 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) Word has length 46 [2021-05-06 08:50:17,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:17,079 INFO L225 Difference]: With dead ends: 83 [2021-05-06 08:50:17,079 INFO L226 Difference]: Without dead ends: 82 [2021-05-06 08:50:17,079 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 40.9ms TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-06 08:50:17,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-05-06 08:50:17,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 80. [2021-05-06 08:50:17,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 49 states have (on average 1.2040816326530612) internal successors, (59), 51 states have internal predecessors, (59), 21 states have call successors, (21), 10 states have call predecessors, (21), 9 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-06 08:50:17,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 98 transitions. [2021-05-06 08:50:17,082 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 98 transitions. Word has length 46 [2021-05-06 08:50:17,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:17,083 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 98 transitions. [2021-05-06 08:50:17,083 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-06 08:50:17,083 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 98 transitions. [2021-05-06 08:50:17,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-06 08:50:17,083 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:17,083 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 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 08:50:17,295 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:50:17,295 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:17,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:17,296 INFO L82 PathProgramCache]: Analyzing trace with hash 1447419744, now seen corresponding path program 1 times [2021-05-06 08:50:17,296 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:17,296 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1412169099] [2021-05-06 08:50:17,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:17,302 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:50:17,303 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1165427869] [2021-05-06 08:50:17,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:50:17,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:50:17,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 08:50:17,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:50:17,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:17,377 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:17,377 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:17,388 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:17,389 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:17,390 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:17,419 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:17,420 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:17,421 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:17,448 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:17,449 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:17,459 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 12 proven. 42 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-06 08:50:17,459 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:17,459 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1412169099] [2021-05-06 08:50:17,459 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:50:17,459 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1165427869] [2021-05-06 08:50:17,459 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1165427869] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 08:50:17,459 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 08:50:17,459 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 08:50:17,460 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2050614120] [2021-05-06 08:50:17,460 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 08:50:17,460 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:17,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 08:50:17,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 08:50:17,460 INFO L87 Difference]: Start difference. First operand 80 states and 98 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), 3 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-06 08:50:17,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:17,490 INFO L93 Difference]: Finished difference Result 93 states and 107 transitions. [2021-05-06 08:50:17,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 08:50:17,491 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), 3 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) Word has length 54 [2021-05-06 08:50:17,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:17,491 INFO L225 Difference]: With dead ends: 93 [2021-05-06 08:50:17,491 INFO L226 Difference]: Without dead ends: 93 [2021-05-06 08:50:17,492 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 10.2ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 08:50:17,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-06 08:50:17,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 92. [2021-05-06 08:50:17,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 58 states have (on average 1.1551724137931034) internal successors, (67), 60 states have internal predecessors, (67), 21 states have call successors, (21), 13 states have call predecessors, (21), 12 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-06 08:50:17,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 106 transitions. [2021-05-06 08:50:17,495 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 106 transitions. Word has length 54 [2021-05-06 08:50:17,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:17,495 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 106 transitions. [2021-05-06 08:50:17,495 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), 3 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-06 08:50:17,495 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 106 transitions. [2021-05-06 08:50:17,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-06 08:50:17,496 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:17,496 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 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 08:50:17,700 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-06 08:50:17,701 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:17,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:17,701 INFO L82 PathProgramCache]: Analyzing trace with hash 1448522011, now seen corresponding path program 1 times [2021-05-06 08:50:17,701 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:17,701 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1002710850] [2021-05-06 08:50:17,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:17,706 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:50:17,706 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [245831715] [2021-05-06 08:50:17,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:50:17,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:50:17,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 08:50:17,757 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:50:17,786 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:17,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:17,798 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:17,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:17,808 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:17,812 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:17,826 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:17,828 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:17,863 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:17,866 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:17,887 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:17,890 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:17,910 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:17,913 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:17,953 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:17,996 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:18,001 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:18,017 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:18,026 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-05-06 08:50:18,026 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:18,026 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1002710850] [2021-05-06 08:50:18,026 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:50:18,026 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [245831715] [2021-05-06 08:50:18,026 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [245831715] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 08:50:18,026 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 08:50:18,026 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 08:50:18,026 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [778002440] [2021-05-06 08:50:18,027 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 08:50:18,027 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:18,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 08:50:18,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-06 08:50:18,027 INFO L87 Difference]: Start difference. First operand 92 states and 106 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, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-06 08:50:18,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:18,172 INFO L93 Difference]: Finished difference Result 102 states and 118 transitions. [2021-05-06 08:50:18,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 08:50:18,173 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, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 54 [2021-05-06 08:50:18,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:18,173 INFO L225 Difference]: With dead ends: 102 [2021-05-06 08:50:18,173 INFO L226 Difference]: Without dead ends: 96 [2021-05-06 08:50:18,174 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 90.1ms TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-05-06 08:50:18,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-05-06 08:50:18,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2021-05-06 08:50:18,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 61 states have (on average 1.1311475409836065) internal successors, (69), 63 states have internal predecessors, (69), 21 states have call successors, (21), 14 states have call predecessors, (21), 13 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-06 08:50:18,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 108 transitions. [2021-05-06 08:50:18,177 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 108 transitions. Word has length 54 [2021-05-06 08:50:18,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:18,177 INFO L480 AbstractCegarLoop]: Abstraction has 96 states and 108 transitions. [2021-05-06 08:50:18,177 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, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-06 08:50:18,177 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 108 transitions. [2021-05-06 08:50:18,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-06 08:50:18,178 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:18,178 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 08:50:18,398 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-05-06 08:50:18,399 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:18,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:18,399 INFO L82 PathProgramCache]: Analyzing trace with hash -161321978, now seen corresponding path program 2 times [2021-05-06 08:50:18,399 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:18,399 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1263557478] [2021-05-06 08:50:18,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:18,405 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:50:18,406 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1827832180] [2021-05-06 08:50:18,406 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 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 08:50:18,470 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-05-06 08:50:18,470 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 08:50:18,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 08:50:18,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:50:18,548 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:18,555 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-05-06 08:50:18,556 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:18,556 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1263557478] [2021-05-06 08:50:18,556 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:50:18,556 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1827832180] [2021-05-06 08:50:18,556 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1827832180] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 08:50:18,556 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 08:50:18,556 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 08:50:18,556 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [211032285] [2021-05-06 08:50:18,557 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 08:50:18,557 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:18,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 08:50:18,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 08:50:18,557 INFO L87 Difference]: Start difference. First operand 96 states and 108 transitions. Second operand has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-06 08:50:18,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:18,598 INFO L93 Difference]: Finished difference Result 108 states and 125 transitions. [2021-05-06 08:50:18,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 08:50:18,599 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 56 [2021-05-06 08:50:18,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:18,600 INFO L225 Difference]: With dead ends: 108 [2021-05-06 08:50:18,600 INFO L226 Difference]: Without dead ends: 108 [2021-05-06 08:50:18,600 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 17.4ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 08:50:18,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-05-06 08:50:18,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2021-05-06 08:50:18,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 68 states have (on average 1.161764705882353) internal successors, (79), 71 states have internal predecessors, (79), 24 states have call successors, (24), 15 states have call predecessors, (24), 14 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2021-05-06 08:50:18,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 124 transitions. [2021-05-06 08:50:18,605 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 124 transitions. Word has length 56 [2021-05-06 08:50:18,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:18,606 INFO L480 AbstractCegarLoop]: Abstraction has 107 states and 124 transitions. [2021-05-06 08:50:18,606 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-06 08:50:18,606 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 124 transitions. [2021-05-06 08:50:18,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 08:50:18,607 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:18,607 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, 1, 1, 1, 1, 1, 1] [2021-05-06 08:50:18,816 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:50:18,817 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:18,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:18,817 INFO L82 PathProgramCache]: Analyzing trace with hash 1294763379, now seen corresponding path program 1 times [2021-05-06 08:50:18,817 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:18,817 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1275804423] [2021-05-06 08:50:18,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:18,823 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:50:18,823 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [264665313] [2021-05-06 08:50:18,823 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 08:50:18,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:50:18,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 08:50:18,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:50:18,918 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:18,919 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:18,924 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:18,949 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:18,950 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:18,950 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:18,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:18,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:18,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:19,003 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:19,004 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:19,018 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 08:50:19,018 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:19,018 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1275804423] [2021-05-06 08:50:19,018 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:50:19,018 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [264665313] [2021-05-06 08:50:19,018 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [264665313] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 08:50:19,018 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 08:50:19,019 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 08:50:19,019 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1195336369] [2021-05-06 08:50:19,019 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 08:50:19,019 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:19,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 08:50:19,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 08:50:19,019 INFO L87 Difference]: Start difference. First operand 107 states and 124 transitions. Second operand has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 5 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (9), 4 states have call predecessors, (9), 5 states have call successors, (9) [2021-05-06 08:50:19,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:19,064 INFO L93 Difference]: Finished difference Result 109 states and 126 transitions. [2021-05-06 08:50:19,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 08:50:19,065 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 5 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (9), 4 states have call predecessors, (9), 5 states have call successors, (9) Word has length 61 [2021-05-06 08:50:19,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:19,066 INFO L225 Difference]: With dead ends: 109 [2021-05-06 08:50:19,066 INFO L226 Difference]: Without dead ends: 109 [2021-05-06 08:50:19,067 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 21.8ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-06 08:50:19,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-05-06 08:50:19,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2021-05-06 08:50:19,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 70 states have (on average 1.1571428571428573) internal successors, (81), 73 states have internal predecessors, (81), 24 states have call successors, (24), 15 states have call predecessors, (24), 14 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2021-05-06 08:50:19,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 126 transitions. [2021-05-06 08:50:19,070 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 126 transitions. Word has length 61 [2021-05-06 08:50:19,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:19,070 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 126 transitions. [2021-05-06 08:50:19,070 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 5 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (9), 4 states have call predecessors, (9), 5 states have call successors, (9) [2021-05-06 08:50:19,070 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 126 transitions. [2021-05-06 08:50:19,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 08:50:19,071 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:19,071 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, 1, 1, 1, 1, 1, 1] [2021-05-06 08:50:19,280 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:50:19,280 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:19,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:19,281 INFO L82 PathProgramCache]: Analyzing trace with hash -1774996485, now seen corresponding path program 2 times [2021-05-06 08:50:19,281 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:19,281 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1585574160] [2021-05-06 08:50:19,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:19,286 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:50:19,286 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1144831201] [2021-05-06 08:50:19,286 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:50:19,401 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 08:50:19,401 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 08:50:19,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-06 08:50:19,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:50:19,687 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:19,695 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 08:50:19,696 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:19,696 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1585574160] [2021-05-06 08:50:19,696 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:50:19,696 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1144831201] [2021-05-06 08:50:19,696 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1144831201] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 08:50:19,696 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 08:50:19,696 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 08:50:19,696 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [347731009] [2021-05-06 08:50:19,697 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 08:50:19,697 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:19,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 08:50:19,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-06 08:50:19,697 INFO L87 Difference]: Start difference. First operand 109 states and 126 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, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-05-06 08:50:19,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:19,813 INFO L93 Difference]: Finished difference Result 153 states and 196 transitions. [2021-05-06 08:50:19,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 08:50:19,814 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, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) Word has length 64 [2021-05-06 08:50:19,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:19,815 INFO L225 Difference]: With dead ends: 153 [2021-05-06 08:50:19,816 INFO L226 Difference]: Without dead ends: 146 [2021-05-06 08:50:19,816 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 28.9ms TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-06 08:50:19,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2021-05-06 08:50:19,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 139. [2021-05-06 08:50:19,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 88 states have (on average 1.2045454545454546) internal successors, (106), 92 states have internal predecessors, (106), 35 states have call successors, (35), 16 states have call predecessors, (35), 15 states have return successors, (32), 30 states have call predecessors, (32), 32 states have call successors, (32) [2021-05-06 08:50:19,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 173 transitions. [2021-05-06 08:50:19,826 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 173 transitions. Word has length 64 [2021-05-06 08:50:19,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:19,827 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 173 transitions. [2021-05-06 08:50:19,827 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, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-05-06 08:50:19,827 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 173 transitions. [2021-05-06 08:50:19,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-06 08:50:19,828 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:19,828 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, 1, 1, 1, 1, 1, 1] [2021-05-06 08:50:20,028 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-06 08:50:20,029 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:20,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:20,029 INFO L82 PathProgramCache]: Analyzing trace with hash 112143503, now seen corresponding path program 1 times [2021-05-06 08:50:20,029 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:20,029 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1645924244] [2021-05-06 08:50:20,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:20,034 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:50:20,034 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2043264458] [2021-05-06 08:50:20,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:50:20,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:50:20,109 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 08:50:20,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:50:20,118 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:20,119 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:20,120 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:20,129 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:20,130 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:20,131 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:20,153 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:20,154 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:20,155 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:20,178 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:20,179 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:20,180 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:20,199 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:20,200 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:20,209 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 08:50:20,209 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:20,209 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1645924244] [2021-05-06 08:50:20,209 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:50:20,210 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2043264458] [2021-05-06 08:50:20,210 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2043264458] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 08:50:20,210 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 08:50:20,210 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 08:50:20,210 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [535535889] [2021-05-06 08:50:20,210 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 08:50:20,210 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:20,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 08:50:20,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-06 08:50:20,211 INFO L87 Difference]: Start difference. First operand 139 states and 173 transitions. Second operand has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 6 states have call successors, (12), 6 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 5 states have call successors, (10) [2021-05-06 08:50:20,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:20,273 INFO L93 Difference]: Finished difference Result 156 states and 184 transitions. [2021-05-06 08:50:20,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 08:50:20,274 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 6 states have call successors, (12), 6 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 5 states have call successors, (10) Word has length 68 [2021-05-06 08:50:20,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:20,275 INFO L225 Difference]: With dead ends: 156 [2021-05-06 08:50:20,275 INFO L226 Difference]: Without dead ends: 156 [2021-05-06 08:50:20,275 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 17.5ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-06 08:50:20,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2021-05-06 08:50:20,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 155. [2021-05-06 08:50:20,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 100 states have (on average 1.16) internal successors, (116), 104 states have internal predecessors, (116), 35 states have call successors, (35), 20 states have call predecessors, (35), 19 states have return successors, (32), 30 states have call predecessors, (32), 32 states have call successors, (32) [2021-05-06 08:50:20,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 183 transitions. [2021-05-06 08:50:20,279 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 183 transitions. Word has length 68 [2021-05-06 08:50:20,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:20,279 INFO L480 AbstractCegarLoop]: Abstraction has 155 states and 183 transitions. [2021-05-06 08:50:20,279 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 6 states have call successors, (12), 6 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 5 states have call successors, (10) [2021-05-06 08:50:20,279 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 183 transitions. [2021-05-06 08:50:20,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-06 08:50:20,280 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:20,280 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, 1, 1, 1, 1, 1, 1] [2021-05-06 08:50:20,496 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-06 08:50:20,496 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:20,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:20,496 INFO L82 PathProgramCache]: Analyzing trace with hash 113245770, now seen corresponding path program 1 times [2021-05-06 08:50:20,496 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:20,496 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1251132152] [2021-05-06 08:50:20,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:20,501 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:50:20,501 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [38706197] [2021-05-06 08:50:20,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:50:20,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:50:20,555 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-06 08:50:20,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:50:20,581 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:20,582 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:20,590 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:20,591 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:20,598 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:20,599 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:20,643 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:20,644 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:20,656 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:20,658 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:20,673 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:20,675 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:20,729 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:20,733 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:20,751 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:20,754 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:20,870 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:20,877 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:20,891 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:20,903 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 36 proven. 10 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-05-06 08:50:20,903 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:20,903 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1251132152] [2021-05-06 08:50:20,903 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:50:20,903 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [38706197] [2021-05-06 08:50:20,903 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [38706197] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 08:50:20,903 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 08:50:20,903 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-06 08:50:20,904 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361341504] [2021-05-06 08:50:20,904 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 08:50:20,904 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:20,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 08:50:20,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2021-05-06 08:50:20,905 INFO L87 Difference]: Start difference. First operand 155 states and 183 transitions. Second operand has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 10 states have internal predecessors, (28), 5 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) [2021-05-06 08:50:21,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:21,096 INFO L93 Difference]: Finished difference Result 161 states and 188 transitions. [2021-05-06 08:50:21,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 08:50:21,097 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 10 states have internal predecessors, (28), 5 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) Word has length 68 [2021-05-06 08:50:21,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:21,099 INFO L225 Difference]: With dead ends: 161 [2021-05-06 08:50:21,099 INFO L226 Difference]: Without dead ends: 161 [2021-05-06 08:50:21,099 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 144.2ms TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-06 08:50:21,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-05-06 08:50:21,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 159. [2021-05-06 08:50:21,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 103 states have (on average 1.1553398058252426) internal successors, (119), 107 states have internal predecessors, (119), 35 states have call successors, (35), 21 states have call predecessors, (35), 20 states have return successors, (32), 30 states have call predecessors, (32), 32 states have call successors, (32) [2021-05-06 08:50:21,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 186 transitions. [2021-05-06 08:50:21,108 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 186 transitions. Word has length 68 [2021-05-06 08:50:21,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:21,108 INFO L480 AbstractCegarLoop]: Abstraction has 159 states and 186 transitions. [2021-05-06 08:50:21,108 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 10 states have internal predecessors, (28), 5 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) [2021-05-06 08:50:21,108 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 186 transitions. [2021-05-06 08:50:21,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 08:50:21,109 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:21,109 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, 1, 1, 1, 1, 1, 1] [2021-05-06 08:50:21,327 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-06 08:50:21,327 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:21,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:21,328 INFO L82 PathProgramCache]: Analyzing trace with hash -742748636, now seen corresponding path program 1 times [2021-05-06 08:50:21,328 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:21,328 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2087028627] [2021-05-06 08:50:21,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:21,335 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:50:21,335 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [771141622] [2021-05-06 08:50:21,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 08:50:21,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:50:21,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-06 08:50:21,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:50:21,496 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:21,503 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 186 trivial. 0 not checked. [2021-05-06 08:50:21,504 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:21,504 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2087028627] [2021-05-06 08:50:21,504 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:50:21,504 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [771141622] [2021-05-06 08:50:21,504 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [771141622] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 08:50:21,504 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 08:50:21,504 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 08:50:21,505 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [557082855] [2021-05-06 08:50:21,506 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 08:50:21,506 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:21,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 08:50:21,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-06 08:50:21,506 INFO L87 Difference]: Start difference. First operand 159 states and 186 transitions. Second operand has 7 states, 6 states have (on average 4.0) internal successors, (24), 6 states have internal predecessors, (24), 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 08:50:21,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:21,587 INFO L93 Difference]: Finished difference Result 180 states and 215 transitions. [2021-05-06 08:50:21,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 08:50:21,587 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.0) internal successors, (24), 6 states have internal predecessors, (24), 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 79 [2021-05-06 08:50:21,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:21,588 INFO L225 Difference]: With dead ends: 180 [2021-05-06 08:50:21,588 INFO L226 Difference]: Without dead ends: 151 [2021-05-06 08:50:21,589 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 35.5ms TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-05-06 08:50:21,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-05-06 08:50:21,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 146. [2021-05-06 08:50:21,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 93 states have (on average 1.1935483870967742) internal successors, (111), 98 states have internal predecessors, (111), 35 states have call successors, (35), 18 states have call predecessors, (35), 17 states have return successors, (31), 29 states have call predecessors, (31), 31 states have call successors, (31) [2021-05-06 08:50:21,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 177 transitions. [2021-05-06 08:50:21,594 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 177 transitions. Word has length 79 [2021-05-06 08:50:21,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:21,594 INFO L480 AbstractCegarLoop]: Abstraction has 146 states and 177 transitions. [2021-05-06 08:50:21,594 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 6 states have (on average 4.0) internal successors, (24), 6 states have internal predecessors, (24), 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 08:50:21,594 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 177 transitions. [2021-05-06 08:50:21,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 08:50:21,595 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:21,595 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, 1, 1, 1, 1, 1, 1] [2021-05-06 08:50:21,811 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:50:21,811 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:21,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:21,812 INFO L82 PathProgramCache]: Analyzing trace with hash -1708320559, now seen corresponding path program 2 times [2021-05-06 08:50:21,812 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:21,812 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [681196761] [2021-05-06 08:50:21,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:21,816 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:50:21,817 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [152207815] [2021-05-06 08:50:21,817 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 08:50:21,866 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 08:50:21,866 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 08:50:21,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 08:50:21,868 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:50:21,874 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:21,875 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:21,875 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:21,896 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:21,897 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:21,897 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:21,919 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:21,932 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:21,932 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:21,953 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:21,954 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:21,955 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:21,977 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:21,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:22,009 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 08:50:22,010 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:22,010 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [681196761] [2021-05-06 08:50:22,010 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:50:22,010 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [152207815] [2021-05-06 08:50:22,010 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [152207815] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 08:50:22,010 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 08:50:22,010 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 08:50:22,010 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1566299638] [2021-05-06 08:50:22,011 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 08:50:22,011 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:22,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 08:50:22,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-06 08:50:22,012 INFO L87 Difference]: Start difference. First operand 146 states and 177 transitions. Second operand has 7 states, 7 states have (on average 4.857142857142857) internal successors, (34), 6 states have internal predecessors, (34), 6 states have call successors, (14), 6 states have call predecessors, (14), 5 states have return successors, (12), 5 states have call predecessors, (12), 6 states have call successors, (12) [2021-05-06 08:50:22,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:22,088 INFO L93 Difference]: Finished difference Result 148 states and 179 transitions. [2021-05-06 08:50:22,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 08:50:22,088 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.857142857142857) internal successors, (34), 6 states have internal predecessors, (34), 6 states have call successors, (14), 6 states have call predecessors, (14), 5 states have return successors, (12), 5 states have call predecessors, (12), 6 states have call successors, (12) Word has length 79 [2021-05-06 08:50:22,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:22,089 INFO L225 Difference]: With dead ends: 148 [2021-05-06 08:50:22,089 INFO L226 Difference]: Without dead ends: 148 [2021-05-06 08:50:22,089 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 24.4ms TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-05-06 08:50:22,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-05-06 08:50:22,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 148. [2021-05-06 08:50:22,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 95 states have (on average 1.1894736842105262) internal successors, (113), 100 states have internal predecessors, (113), 35 states have call successors, (35), 18 states have call predecessors, (35), 17 states have return successors, (31), 29 states have call predecessors, (31), 31 states have call successors, (31) [2021-05-06 08:50:22,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 179 transitions. [2021-05-06 08:50:22,094 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 179 transitions. Word has length 79 [2021-05-06 08:50:22,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:22,094 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 179 transitions. [2021-05-06 08:50:22,094 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.857142857142857) internal successors, (34), 6 states have internal predecessors, (34), 6 states have call successors, (14), 6 states have call predecessors, (14), 5 states have return successors, (12), 5 states have call predecessors, (12), 6 states have call successors, (12) [2021-05-06 08:50:22,094 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 179 transitions. [2021-05-06 08:50:22,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 08:50:22,095 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:22,095 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, 1, 1, 1, 1, 1, 1] [2021-05-06 08:50:22,311 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-06 08:50:22,311 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:22,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:22,312 INFO L82 PathProgramCache]: Analyzing trace with hash 1815149533, now seen corresponding path program 3 times [2021-05-06 08:50:22,312 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:22,312 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [222799372] [2021-05-06 08:50:22,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:22,316 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:50:22,317 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1602477524] [2021-05-06 08:50:22,317 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 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 08:50:22,370 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-06 08:50:22,370 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 08:50:22,371 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-06 08:50:22,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:50:22,533 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:22,534 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:22,542 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:22,554 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 62 proven. 7 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2021-05-06 08:50:22,554 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:22,554 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [222799372] [2021-05-06 08:50:22,554 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:50:22,554 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1602477524] [2021-05-06 08:50:22,555 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1602477524] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 08:50:22,555 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 08:50:22,555 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-06 08:50:22,555 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [515305132] [2021-05-06 08:50:22,556 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 08:50:22,556 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:22,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 08:50:22,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-06 08:50:22,556 INFO L87 Difference]: Start difference. First operand 148 states and 179 transitions. Second operand has 8 states, 8 states have (on average 2.75) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) [2021-05-06 08:50:22,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:22,910 INFO L93 Difference]: Finished difference Result 176 states and 218 transitions. [2021-05-06 08:50:22,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 08:50:22,910 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) Word has length 82 [2021-05-06 08:50:22,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:22,911 INFO L225 Difference]: With dead ends: 176 [2021-05-06 08:50:22,911 INFO L226 Difference]: Without dead ends: 176 [2021-05-06 08:50:22,911 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 85.3ms TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-05-06 08:50:22,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2021-05-06 08:50:22,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 170. [2021-05-06 08:50:22,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 109 states have (on average 1.201834862385321) internal successors, (131), 116 states have internal predecessors, (131), 41 states have call successors, (41), 20 states have call predecessors, (41), 19 states have return successors, (37), 33 states have call predecessors, (37), 37 states have call successors, (37) [2021-05-06 08:50:22,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 209 transitions. [2021-05-06 08:50:22,916 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 209 transitions. Word has length 82 [2021-05-06 08:50:22,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:22,916 INFO L480 AbstractCegarLoop]: Abstraction has 170 states and 209 transitions. [2021-05-06 08:50:22,916 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) [2021-05-06 08:50:22,916 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 209 transitions. [2021-05-06 08:50:22,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-06 08:50:22,916 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:22,916 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, 1, 1, 1, 1, 1, 1] [2021-05-06 08:50:23,132 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:50:23,132 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:23,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:23,133 INFO L82 PathProgramCache]: Analyzing trace with hash -1960725647, now seen corresponding path program 2 times [2021-05-06 08:50:23,133 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:23,133 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [534562776] [2021-05-06 08:50:23,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:23,138 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:50:23,138 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1123365399] [2021-05-06 08:50:23,138 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 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 08:50:23,192 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 08:50:23,192 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 08:50:23,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-06 08:50:23,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:50:23,203 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,204 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,205 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,213 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,215 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,215 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,235 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,236 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,236 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,257 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,258 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,259 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,301 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,302 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,311 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 08:50:23,311 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:23,311 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [534562776] [2021-05-06 08:50:23,311 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:50:23,311 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1123365399] [2021-05-06 08:50:23,312 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1123365399] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 08:50:23,312 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 08:50:23,312 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-06 08:50:23,312 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [331090908] [2021-05-06 08:50:23,312 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 08:50:23,312 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:23,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 08:50:23,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-06 08:50:23,313 INFO L87 Difference]: Start difference. First operand 170 states and 209 transitions. Second operand has 8 states, 8 states have (on average 4.625) internal successors, (37), 7 states have internal predecessors, (37), 7 states have call successors, (15), 7 states have call predecessors, (15), 5 states have return successors, (13), 5 states have call predecessors, (13), 6 states have call successors, (13) [2021-05-06 08:50:23,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:23,378 INFO L93 Difference]: Finished difference Result 197 states and 233 transitions. [2021-05-06 08:50:23,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 08:50:23,378 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.625) internal successors, (37), 7 states have internal predecessors, (37), 7 states have call successors, (15), 7 states have call predecessors, (15), 5 states have return successors, (13), 5 states have call predecessors, (13), 6 states have call successors, (13) Word has length 86 [2021-05-06 08:50:23,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:23,380 INFO L225 Difference]: With dead ends: 197 [2021-05-06 08:50:23,380 INFO L226 Difference]: Without dead ends: 197 [2021-05-06 08:50:23,380 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 21.3ms TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-05-06 08:50:23,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2021-05-06 08:50:23,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 196. [2021-05-06 08:50:23,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 127 states have (on average 1.1653543307086613) internal successors, (148), 134 states have internal predecessors, (148), 44 states have call successors, (44), 25 states have call predecessors, (44), 24 states have return successors, (40), 36 states have call predecessors, (40), 40 states have call successors, (40) [2021-05-06 08:50:23,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 232 transitions. [2021-05-06 08:50:23,385 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 232 transitions. Word has length 86 [2021-05-06 08:50:23,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:23,385 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 232 transitions. [2021-05-06 08:50:23,385 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.625) internal successors, (37), 7 states have internal predecessors, (37), 7 states have call successors, (15), 7 states have call predecessors, (15), 5 states have return successors, (13), 5 states have call predecessors, (13), 6 states have call successors, (13) [2021-05-06 08:50:23,385 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 232 transitions. [2021-05-06 08:50:23,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-06 08:50:23,387 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:23,387 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, 1, 1, 1, 1, 1, 1] [2021-05-06 08:50:23,601 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:50:23,601 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:23,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:23,601 INFO L82 PathProgramCache]: Analyzing trace with hash -1959623380, now seen corresponding path program 2 times [2021-05-06 08:50:23,601 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:23,601 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1740514183] [2021-05-06 08:50:23,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:23,609 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:50:23,609 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [685967316] [2021-05-06 08:50:23,609 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 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 08:50:23,684 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 08:50:23,684 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 08:50:23,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 39 conjunts are in the unsatisfiable core [2021-05-06 08:50:23,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:50:23,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,727 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,735 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,736 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,743 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,743 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,766 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,768 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,774 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,775 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,782 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,785 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,841 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,843 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,853 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,855 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,865 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,867 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,919 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,922 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,936 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:23,939 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:24,014 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:24,017 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:24,035 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:24,046 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 36 proven. 37 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-05-06 08:50:24,047 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:24,047 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1740514183] [2021-05-06 08:50:24,047 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:50:24,047 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [685967316] [2021-05-06 08:50:24,047 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [685967316] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 08:50:24,047 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 08:50:24,047 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-05-06 08:50:24,047 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1743315133] [2021-05-06 08:50:24,048 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 08:50:24,048 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:24,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 08:50:24,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2021-05-06 08:50:24,049 INFO L87 Difference]: Start difference. First operand 196 states and 232 transitions. Second operand has 15 states, 15 states have (on average 2.066666666666667) internal successors, (31), 13 states have internal predecessors, (31), 6 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 6 states have call predecessors, (13), 5 states have call successors, (13) [2021-05-06 08:50:24,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:24,459 INFO L93 Difference]: Finished difference Result 197 states and 231 transitions. [2021-05-06 08:50:24,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 08:50:24,459 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.066666666666667) internal successors, (31), 13 states have internal predecessors, (31), 6 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 6 states have call predecessors, (13), 5 states have call successors, (13) Word has length 86 [2021-05-06 08:50:24,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:24,460 INFO L225 Difference]: With dead ends: 197 [2021-05-06 08:50:24,460 INFO L226 Difference]: Without dead ends: 197 [2021-05-06 08:50:24,460 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 71 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 179.4ms TimeCoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2021-05-06 08:50:24,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2021-05-06 08:50:24,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 194. [2021-05-06 08:50:24,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 126 states have (on average 1.1587301587301588) internal successors, (146), 133 states have internal predecessors, (146), 42 states have call successors, (42), 26 states have call predecessors, (42), 25 states have return successors, (39), 34 states have call predecessors, (39), 39 states have call successors, (39) [2021-05-06 08:50:24,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 227 transitions. [2021-05-06 08:50:24,464 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 227 transitions. Word has length 86 [2021-05-06 08:50:24,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:24,464 INFO L480 AbstractCegarLoop]: Abstraction has 194 states and 227 transitions. [2021-05-06 08:50:24,465 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.066666666666667) internal successors, (31), 13 states have internal predecessors, (31), 6 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 6 states have call predecessors, (13), 5 states have call successors, (13) [2021-05-06 08:50:24,465 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 227 transitions. [2021-05-06 08:50:24,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-05-06 08:50:24,465 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:24,475 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, 1, 1, 1, 1, 1, 1] [2021-05-06 08:50:24,676 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-05-06 08:50:24,676 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:24,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:24,676 INFO L82 PathProgramCache]: Analyzing trace with hash 31379631, now seen corresponding path program 3 times [2021-05-06 08:50:24,676 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:24,676 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [855893392] [2021-05-06 08:50:24,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:24,681 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:50:24,681 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [543707401] [2021-05-06 08:50:24,681 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 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 08:50:24,816 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-05-06 08:50:24,816 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 08:50:24,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-06 08:50:24,819 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:50:24,826 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:24,827 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:24,828 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:24,852 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:24,853 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:24,854 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:24,877 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:24,879 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:24,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:24,902 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:24,903 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:24,903 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:24,926 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:24,927 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:24,927 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:24,949 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:24,950 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:24,964 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 08:50:24,964 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:24,964 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [855893392] [2021-05-06 08:50:24,964 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:50:24,964 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [543707401] [2021-05-06 08:50:24,964 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [543707401] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 08:50:24,964 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 08:50:24,965 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-06 08:50:24,965 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [982455130] [2021-05-06 08:50:24,965 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 08:50:24,965 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:24,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 08:50:24,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-06 08:50:24,965 INFO L87 Difference]: Start difference. First operand 194 states and 227 transitions. Second operand has 8 states, 8 states have (on average 5.0) internal successors, (40), 7 states have internal predecessors, (40), 7 states have call successors, (17), 7 states have call predecessors, (17), 6 states have return successors, (15), 6 states have call predecessors, (15), 7 states have call successors, (15) [2021-05-06 08:50:25,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:25,051 INFO L93 Difference]: Finished difference Result 196 states and 229 transitions. [2021-05-06 08:50:25,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 08:50:25,051 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 7 states have internal predecessors, (40), 7 states have call successors, (17), 7 states have call predecessors, (17), 6 states have return successors, (15), 6 states have call predecessors, (15), 7 states have call successors, (15) Word has length 97 [2021-05-06 08:50:25,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:25,053 INFO L225 Difference]: With dead ends: 196 [2021-05-06 08:50:25,053 INFO L226 Difference]: Without dead ends: 196 [2021-05-06 08:50:25,053 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 36.6ms TimeCoverageRelationStatistics Valid=51, Invalid=81, Unknown=0, NotChecked=0, Total=132 [2021-05-06 08:50:25,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-05-06 08:50:25,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2021-05-06 08:50:25,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 128 states have (on average 1.15625) internal successors, (148), 135 states have internal predecessors, (148), 42 states have call successors, (42), 26 states have call predecessors, (42), 25 states have return successors, (39), 34 states have call predecessors, (39), 39 states have call successors, (39) [2021-05-06 08:50:25,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 229 transitions. [2021-05-06 08:50:25,058 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 229 transitions. Word has length 97 [2021-05-06 08:50:25,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:25,058 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 229 transitions. [2021-05-06 08:50:25,058 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 7 states have internal predecessors, (40), 7 states have call successors, (17), 7 states have call predecessors, (17), 6 states have return successors, (15), 6 states have call predecessors, (15), 7 states have call successors, (15) [2021-05-06 08:50:25,058 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 229 transitions. [2021-05-06 08:50:25,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-05-06 08:50:25,059 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:25,059 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, 1, 1, 1, 1, 1, 1] [2021-05-06 08:50:25,272 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:50:25,273 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:25,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:25,273 INFO L82 PathProgramCache]: Analyzing trace with hash -874901792, now seen corresponding path program 3 times [2021-05-06 08:50:25,273 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:25,273 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1409330942] [2021-05-06 08:50:25,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:25,278 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:50:25,278 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1018921068] [2021-05-06 08:50:25,278 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 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 08:50:25,351 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-06 08:50:25,351 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 08:50:25,352 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 45 conjunts are in the unsatisfiable core [2021-05-06 08:50:25,354 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:50:25,392 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:25,393 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:25,401 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:25,402 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:25,409 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:25,410 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:25,441 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:25,449 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:25,457 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:25,458 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:25,465 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:25,466 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:25,500 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:25,501 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:25,509 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:25,510 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:25,518 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:25,519 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:25,531 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:25,532 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:25,539 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:25,540 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:25,570 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:25,571 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:25,578 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:25,579 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:25,754 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:25,757 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:25,774 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:25,789 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 61 proven. 29 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2021-05-06 08:50:25,790 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:25,790 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1409330942] [2021-05-06 08:50:25,790 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:50:25,790 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1018921068] [2021-05-06 08:50:25,790 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1018921068] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 08:50:25,790 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 08:50:25,790 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-05-06 08:50:25,790 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902829592] [2021-05-06 08:50:25,790 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 08:50:25,790 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:25,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 08:50:25,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=205, Unknown=0, NotChecked=0, Total=240 [2021-05-06 08:50:25,791 INFO L87 Difference]: Start difference. First operand 196 states and 229 transitions. Second operand has 16 states, 16 states have (on average 2.1875) internal successors, (35), 13 states have internal predecessors, (35), 6 states have call successors, (17), 2 states have call predecessors, (17), 3 states have return successors, (15), 7 states have call predecessors, (15), 5 states have call successors, (15) [2021-05-06 08:50:26,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:26,706 INFO L93 Difference]: Finished difference Result 207 states and 239 transitions. [2021-05-06 08:50:26,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 08:50:26,707 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.1875) internal successors, (35), 13 states have internal predecessors, (35), 6 states have call successors, (17), 2 states have call predecessors, (17), 3 states have return successors, (15), 7 states have call predecessors, (15), 5 states have call successors, (15) Word has length 100 [2021-05-06 08:50:26,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:26,707 INFO L225 Difference]: With dead ends: 207 [2021-05-06 08:50:26,707 INFO L226 Difference]: Without dead ends: 186 [2021-05-06 08:50:26,708 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 326.6ms TimeCoverageRelationStatistics Valid=58, Invalid=362, Unknown=0, NotChecked=0, Total=420 [2021-05-06 08:50:26,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2021-05-06 08:50:26,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 186. [2021-05-06 08:50:26,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 186 states, 122 states have (on average 1.139344262295082) internal successors, (139), 128 states have internal predecessors, (139), 39 states have call successors, (39), 25 states have call predecessors, (39), 24 states have return successors, (36), 32 states have call predecessors, (36), 36 states have call successors, (36) [2021-05-06 08:50:26,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 214 transitions. [2021-05-06 08:50:26,711 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 214 transitions. Word has length 100 [2021-05-06 08:50:26,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:26,712 INFO L480 AbstractCegarLoop]: Abstraction has 186 states and 214 transitions. [2021-05-06 08:50:26,712 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.1875) internal successors, (35), 13 states have internal predecessors, (35), 6 states have call successors, (17), 2 states have call predecessors, (17), 3 states have return successors, (15), 7 states have call predecessors, (15), 5 states have call successors, (15) [2021-05-06 08:50:26,712 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 214 transitions. [2021-05-06 08:50:26,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-05-06 08:50:26,712 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:26,712 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, 1, 1, 1, 1, 1, 1] [2021-05-06 08:50:26,921 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-06 08:50:26,921 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:26,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:26,921 INFO L82 PathProgramCache]: Analyzing trace with hash -873799525, now seen corresponding path program 3 times [2021-05-06 08:50:26,921 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:26,922 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [716980813] [2021-05-06 08:50:26,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:26,932 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:50:26,933 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [855763427] [2021-05-06 08:50:26,933 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:50:28,021 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-06 08:50:28,022 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 08:50:28,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 40 conjunts are in the unsatisfiable core [2021-05-06 08:50:28,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:50:28,087 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:28,088 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:28,096 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:28,097 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:28,119 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:28,120 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:28,143 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:28,144 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:28,159 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:28,160 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:28,166 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:28,167 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:28,204 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:28,205 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:28,211 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:28,212 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:28,228 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:28,229 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:28,241 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:28,253 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:28,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:28,261 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:28,300 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:28,332 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:28,339 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:28,340 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:28,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:28,457 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:28,484 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:28,494 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 08:50:28,494 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:28,495 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [716980813] [2021-05-06 08:50:28,495 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:50:28,495 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [855763427] [2021-05-06 08:50:28,495 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [855763427] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 08:50:28,495 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 08:50:28,495 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-06 08:50:28,495 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384796538] [2021-05-06 08:50:28,495 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 08:50:28,495 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:28,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 08:50:28,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2021-05-06 08:50:28,496 INFO L87 Difference]: Start difference. First operand 186 states and 214 transitions. Second operand has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 11 states have internal predecessors, (32), 6 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) [2021-05-06 08:50:28,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:28,808 INFO L93 Difference]: Finished difference Result 190 states and 217 transitions. [2021-05-06 08:50:28,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 08:50:28,808 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 11 states have internal predecessors, (32), 6 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) Word has length 100 [2021-05-06 08:50:28,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:28,809 INFO L225 Difference]: With dead ends: 190 [2021-05-06 08:50:28,809 INFO L226 Difference]: Without dead ends: 155 [2021-05-06 08:50:28,809 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 128.6ms TimeCoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2021-05-06 08:50:28,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-05-06 08:50:28,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 155. [2021-05-06 08:50:28,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 100 states have (on average 1.16) internal successors, (116), 105 states have internal predecessors, (116), 34 states have call successors, (34), 21 states have call predecessors, (34), 20 states have return successors, (32), 28 states have call predecessors, (32), 32 states have call successors, (32) [2021-05-06 08:50:28,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 182 transitions. [2021-05-06 08:50:28,813 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 182 transitions. Word has length 100 [2021-05-06 08:50:28,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:28,813 INFO L480 AbstractCegarLoop]: Abstraction has 155 states and 182 transitions. [2021-05-06 08:50:28,813 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 11 states have internal predecessors, (32), 6 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) [2021-05-06 08:50:28,813 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 182 transitions. [2021-05-06 08:50:28,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-05-06 08:50:28,813 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:28,813 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, 1, 1, 1, 1, 1, 1] [2021-05-06 08:50:29,017 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-05-06 08:50:29,017 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:29,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:29,017 INFO L82 PathProgramCache]: Analyzing trace with hash 1453917651, now seen corresponding path program 4 times [2021-05-06 08:50:29,017 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:29,017 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [250028011] [2021-05-06 08:50:29,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:29,022 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:50:29,022 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1902094864] [2021-05-06 08:50:29,022 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:50:29,138 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 08:50:29,139 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 08:50:29,139 INFO L263 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-06 08:50:29,141 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:50:29,148 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,152 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,152 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,162 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,163 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,180 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,210 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,214 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,214 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,232 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,233 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,234 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,252 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,253 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,253 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,274 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,274 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,290 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,300 INFO L134 CoverageAnalysis]: Checked inductivity of 430 backedges. 28 proven. 350 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-05-06 08:50:29,300 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:29,300 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [250028011] [2021-05-06 08:50:29,300 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:50:29,300 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1902094864] [2021-05-06 08:50:29,300 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1902094864] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 08:50:29,300 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 08:50:29,300 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-06 08:50:29,300 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [543033003] [2021-05-06 08:50:29,300 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 08:50:29,300 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:29,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 08:50:29,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-06 08:50:29,301 INFO L87 Difference]: Start difference. First operand 155 states and 182 transitions. Second operand has 9 states, 9 states have (on average 4.777777777777778) internal successors, (43), 8 states have internal predecessors, (43), 8 states have call successors, (18), 8 states have call predecessors, (18), 6 states have return successors, (16), 6 states have call predecessors, (16), 7 states have call successors, (16) [2021-05-06 08:50:29,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:29,383 INFO L93 Difference]: Finished difference Result 186 states and 216 transitions. [2021-05-06 08:50:29,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 08:50:29,384 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.777777777777778) internal successors, (43), 8 states have internal predecessors, (43), 8 states have call successors, (18), 8 states have call predecessors, (18), 6 states have return successors, (16), 6 states have call predecessors, (16), 7 states have call successors, (16) Word has length 104 [2021-05-06 08:50:29,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:29,385 INFO L225 Difference]: With dead ends: 186 [2021-05-06 08:50:29,385 INFO L226 Difference]: Without dead ends: 186 [2021-05-06 08:50:29,385 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 25.2ms TimeCoverageRelationStatistics Valid=34, Invalid=56, Unknown=0, NotChecked=0, Total=90 [2021-05-06 08:50:29,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2021-05-06 08:50:29,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 185. [2021-05-06 08:50:29,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 121 states have (on average 1.1487603305785123) internal successors, (139), 126 states have internal predecessors, (139), 39 states have call successors, (39), 25 states have call predecessors, (39), 24 states have return successors, (37), 33 states have call predecessors, (37), 37 states have call successors, (37) [2021-05-06 08:50:29,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 215 transitions. [2021-05-06 08:50:29,392 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 215 transitions. Word has length 104 [2021-05-06 08:50:29,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:29,393 INFO L480 AbstractCegarLoop]: Abstraction has 185 states and 215 transitions. [2021-05-06 08:50:29,393 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 4.777777777777778) internal successors, (43), 8 states have internal predecessors, (43), 8 states have call successors, (18), 8 states have call predecessors, (18), 6 states have return successors, (16), 6 states have call predecessors, (16), 7 states have call successors, (16) [2021-05-06 08:50:29,393 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 215 transitions. [2021-05-06 08:50:29,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-05-06 08:50:29,394 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:29,394 INFO L523 BasicCegarLoop]: trace histogram [15, 14, 14, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 08:50:29,610 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:50:29,611 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:29,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:29,611 INFO L82 PathProgramCache]: Analyzing trace with hash 1455019918, now seen corresponding path program 4 times [2021-05-06 08:50:29,611 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:29,611 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [280153867] [2021-05-06 08:50:29,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:29,615 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:50:29,615 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [121013744] [2021-05-06 08:50:29,615 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:50:29,716 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 08:50:29,716 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 08:50:29,717 INFO L263 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-06 08:50:29,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:50:29,830 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,832 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,846 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,847 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,854 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,855 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,900 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,901 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,909 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,912 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,931 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,932 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,961 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,962 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,969 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,970 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,976 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:29,977 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:30,060 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:30,062 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:30,075 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:30,106 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:30,171 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:30,173 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:30,204 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:30,217 INFO L134 CoverageAnalysis]: Checked inductivity of 431 backedges. 28 proven. 39 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2021-05-06 08:50:30,217 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:30,217 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [280153867] [2021-05-06 08:50:30,218 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:50:30,218 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [121013744] [2021-05-06 08:50:30,218 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [121013744] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 08:50:30,218 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 08:50:30,218 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-06 08:50:30,219 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [372069182] [2021-05-06 08:50:30,219 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 08:50:30,219 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:30,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 08:50:30,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-05-06 08:50:30,220 INFO L87 Difference]: Start difference. First operand 185 states and 215 transitions. Second operand has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 10 states have internal predecessors, (31), 7 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) [2021-05-06 08:50:30,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:30,470 INFO L93 Difference]: Finished difference Result 203 states and 240 transitions. [2021-05-06 08:50:30,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 08:50:30,471 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 10 states have internal predecessors, (31), 7 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) Word has length 104 [2021-05-06 08:50:30,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:30,472 INFO L225 Difference]: With dead ends: 203 [2021-05-06 08:50:30,472 INFO L226 Difference]: Without dead ends: 203 [2021-05-06 08:50:30,472 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 122.2ms TimeCoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2021-05-06 08:50:30,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2021-05-06 08:50:30,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 200. [2021-05-06 08:50:30,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 130 states have (on average 1.1615384615384616) internal successors, (151), 135 states have internal predecessors, (151), 43 states have call successors, (43), 27 states have call predecessors, (43), 26 states have return successors, (41), 37 states have call predecessors, (41), 41 states have call successors, (41) [2021-05-06 08:50:30,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 235 transitions. [2021-05-06 08:50:30,477 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 235 transitions. Word has length 104 [2021-05-06 08:50:30,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:30,478 INFO L480 AbstractCegarLoop]: Abstraction has 200 states and 235 transitions. [2021-05-06 08:50:30,478 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 10 states have internal predecessors, (31), 7 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) [2021-05-06 08:50:30,478 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 235 transitions. [2021-05-06 08:50:30,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-05-06 08:50:30,488 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:30,488 INFO L523 BasicCegarLoop]: trace histogram [17, 16, 16, 6, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 08:50:30,700 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-05-06 08:50:30,701 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:30,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:30,701 INFO L82 PathProgramCache]: Analyzing trace with hash 1693551885, now seen corresponding path program 4 times [2021-05-06 08:50:30,701 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:30,701 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [812065585] [2021-05-06 08:50:30,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:30,705 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:50:30,705 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2002223656] [2021-05-06 08:50:30,705 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:50:30,759 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 08:50:30,760 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 08:50:30,761 INFO L263 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-06 08:50:30,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:50:30,770 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:30,771 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:30,771 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:30,780 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:30,781 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:30,781 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:30,801 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:30,802 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:30,802 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:30,822 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:30,823 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:30,824 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:30,845 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:30,846 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:30,846 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:30,890 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:30,891 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:30,891 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:30,916 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:30,917 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:30,933 INFO L134 CoverageAnalysis]: Checked inductivity of 582 backedges. 90 proven. 430 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2021-05-06 08:50:30,933 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:30,933 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [812065585] [2021-05-06 08:50:30,933 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:50:30,933 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2002223656] [2021-05-06 08:50:30,934 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2002223656] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 08:50:30,934 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 08:50:30,934 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-06 08:50:30,934 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1305008987] [2021-05-06 08:50:30,935 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 08:50:30,935 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:30,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 08:50:30,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-06 08:50:30,935 INFO L87 Difference]: Start difference. First operand 200 states and 235 transitions. Second operand has 9 states, 9 states have (on average 5.111111111111111) internal successors, (46), 8 states have internal predecessors, (46), 8 states have call successors, (20), 8 states have call predecessors, (20), 7 states have return successors, (18), 7 states have call predecessors, (18), 8 states have call successors, (18) [2021-05-06 08:50:31,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:31,050 INFO L93 Difference]: Finished difference Result 202 states and 237 transitions. [2021-05-06 08:50:31,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 08:50:31,050 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.111111111111111) internal successors, (46), 8 states have internal predecessors, (46), 8 states have call successors, (20), 8 states have call predecessors, (20), 7 states have return successors, (18), 7 states have call predecessors, (18), 8 states have call successors, (18) Word has length 115 [2021-05-06 08:50:31,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:31,051 INFO L225 Difference]: With dead ends: 202 [2021-05-06 08:50:31,051 INFO L226 Difference]: Without dead ends: 202 [2021-05-06 08:50:31,051 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 50.0ms TimeCoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2021-05-06 08:50:31,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2021-05-06 08:50:31,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 202. [2021-05-06 08:50:31,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 132 states have (on average 1.1590909090909092) internal successors, (153), 137 states have internal predecessors, (153), 43 states have call successors, (43), 27 states have call predecessors, (43), 26 states have return successors, (41), 37 states have call predecessors, (41), 41 states have call successors, (41) [2021-05-06 08:50:31,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 237 transitions. [2021-05-06 08:50:31,057 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 237 transitions. Word has length 115 [2021-05-06 08:50:31,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:31,057 INFO L480 AbstractCegarLoop]: Abstraction has 202 states and 237 transitions. [2021-05-06 08:50:31,061 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 5.111111111111111) internal successors, (46), 8 states have internal predecessors, (46), 8 states have call successors, (20), 8 states have call predecessors, (20), 7 states have return successors, (18), 7 states have call predecessors, (18), 8 states have call successors, (18) [2021-05-06 08:50:31,062 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 237 transitions. [2021-05-06 08:50:31,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-05-06 08:50:31,062 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:31,062 INFO L523 BasicCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 08:50:31,288 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:50:31,289 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:31,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:31,289 INFO L82 PathProgramCache]: Analyzing trace with hash 220761538, now seen corresponding path program 5 times [2021-05-06 08:50:31,289 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:31,289 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [663628436] [2021-05-06 08:50:31,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:31,294 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:50:31,294 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1854669951] [2021-05-06 08:50:31,294 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:50:31,417 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-05-06 08:50:31,417 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 08:50:31,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-06 08:50:31,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:50:31,427 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:31,433 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:31,433 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:31,446 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:31,447 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:31,448 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:31,471 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:31,472 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:31,472 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:31,492 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:31,493 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:31,494 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:31,515 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:31,516 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:31,516 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:31,538 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:31,539 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:31,540 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:31,558 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:31,559 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:31,560 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:31,579 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:31,580 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:31,589 INFO L134 CoverageAnalysis]: Checked inductivity of 558 backedges. 32 proven. 470 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-05-06 08:50:31,589 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:31,589 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [663628436] [2021-05-06 08:50:31,590 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:50:31,590 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1854669951] [2021-05-06 08:50:31,590 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1854669951] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 08:50:31,590 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 08:50:31,590 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-06 08:50:31,590 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831022269] [2021-05-06 08:50:31,590 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 08:50:31,590 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:31,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 08:50:31,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-06 08:50:31,591 INFO L87 Difference]: Start difference. First operand 202 states and 237 transitions. Second operand has 10 states, 10 states have (on average 5.0) internal successors, (50), 9 states have internal predecessors, (50), 9 states have call successors, (20), 9 states have call predecessors, (20), 7 states have return successors, (18), 7 states have call predecessors, (18), 8 states have call successors, (18) [2021-05-06 08:50:31,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:31,783 INFO L93 Difference]: Finished difference Result 254 states and 291 transitions. [2021-05-06 08:50:31,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 08:50:31,783 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 5.0) internal successors, (50), 9 states have internal predecessors, (50), 9 states have call successors, (20), 9 states have call predecessors, (20), 7 states have return successors, (18), 7 states have call predecessors, (18), 8 states have call successors, (18) Word has length 118 [2021-05-06 08:50:31,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:31,784 INFO L225 Difference]: With dead ends: 254 [2021-05-06 08:50:31,784 INFO L226 Difference]: Without dead ends: 252 [2021-05-06 08:50:31,784 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 47.9ms TimeCoverageRelationStatistics Valid=48, Invalid=84, Unknown=0, NotChecked=0, Total=132 [2021-05-06 08:50:31,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2021-05-06 08:50:31,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 249. [2021-05-06 08:50:31,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 249 states, 166 states have (on average 1.144578313253012) internal successors, (190), 171 states have internal predecessors, (190), 50 states have call successors, (50), 34 states have call predecessors, (50), 32 states have return successors, (47), 43 states have call predecessors, (47), 47 states have call successors, (47) [2021-05-06 08:50:31,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 287 transitions. [2021-05-06 08:50:31,788 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 287 transitions. Word has length 118 [2021-05-06 08:50:31,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:31,788 INFO L480 AbstractCegarLoop]: Abstraction has 249 states and 287 transitions. [2021-05-06 08:50:31,788 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 5.0) internal successors, (50), 9 states have internal predecessors, (50), 9 states have call successors, (20), 9 states have call predecessors, (20), 7 states have return successors, (18), 7 states have call predecessors, (18), 8 states have call successors, (18) [2021-05-06 08:50:31,789 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 287 transitions. [2021-05-06 08:50:31,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-05-06 08:50:31,789 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:31,789 INFO L523 BasicCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 08:50:32,006 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-06 08:50:32,006 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:32,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:32,007 INFO L82 PathProgramCache]: Analyzing trace with hash 221863805, now seen corresponding path program 5 times [2021-05-06 08:50:32,007 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:32,007 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [104943122] [2021-05-06 08:50:32,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:32,013 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:50:32,013 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1030828941] [2021-05-06 08:50:32,013 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:50:32,131 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-05-06 08:50:32,131 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 08:50:32,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 57 conjunts are in the unsatisfiable core [2021-05-06 08:50:32,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:50:32,267 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:32,269 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:32,278 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:32,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:32,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:32,293 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:32,348 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:32,350 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:32,362 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:32,364 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:32,429 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:32,431 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:32,443 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:32,445 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:32,559 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:32,561 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:32,580 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:32,597 INFO L134 CoverageAnalysis]: Checked inductivity of 560 backedges. 104 proven. 93 refuted. 0 times theorem prover too weak. 363 trivial. 0 not checked. [2021-05-06 08:50:32,597 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:32,597 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [104943122] [2021-05-06 08:50:32,597 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:50:32,597 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1030828941] [2021-05-06 08:50:32,597 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1030828941] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 08:50:32,597 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 08:50:32,597 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-05-06 08:50:32,598 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86106072] [2021-05-06 08:50:32,598 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 08:50:32,598 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:32,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 08:50:32,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-05-06 08:50:32,598 INFO L87 Difference]: Start difference. First operand 249 states and 287 transitions. Second operand has 15 states, 15 states have (on average 2.533333333333333) internal successors, (38), 14 states have internal predecessors, (38), 8 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (18), 7 states have call predecessors, (18), 7 states have call successors, (18) [2021-05-06 08:50:33,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:33,054 INFO L93 Difference]: Finished difference Result 264 states and 306 transitions. [2021-05-06 08:50:33,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 08:50:33,054 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.533333333333333) internal successors, (38), 14 states have internal predecessors, (38), 8 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (18), 7 states have call predecessors, (18), 7 states have call successors, (18) Word has length 118 [2021-05-06 08:50:33,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:33,055 INFO L225 Difference]: With dead ends: 264 [2021-05-06 08:50:33,055 INFO L226 Difference]: Without dead ends: 264 [2021-05-06 08:50:33,056 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 101 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 239.0ms TimeCoverageRelationStatistics Valid=41, Invalid=231, Unknown=0, NotChecked=0, Total=272 [2021-05-06 08:50:33,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2021-05-06 08:50:33,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 262. [2021-05-06 08:50:33,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 175 states have (on average 1.1485714285714286) internal successors, (201), 180 states have internal predecessors, (201), 52 states have call successors, (52), 35 states have call predecessors, (52), 34 states have return successors, (50), 46 states have call predecessors, (50), 50 states have call successors, (50) [2021-05-06 08:50:33,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 303 transitions. [2021-05-06 08:50:33,060 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 303 transitions. Word has length 118 [2021-05-06 08:50:33,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:33,060 INFO L480 AbstractCegarLoop]: Abstraction has 262 states and 303 transitions. [2021-05-06 08:50:33,060 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.533333333333333) internal successors, (38), 14 states have internal predecessors, (38), 8 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (18), 7 states have call predecessors, (18), 7 states have call successors, (18) [2021-05-06 08:50:33,060 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 303 transitions. [2021-05-06 08:50:33,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-05-06 08:50:33,061 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:33,061 INFO L523 BasicCegarLoop]: trace histogram [18, 17, 17, 5, 5, 5, 5, 5, 5, 5, 5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 08:50:33,281 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-06 08:50:33,281 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:33,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:33,281 INFO L82 PathProgramCache]: Analyzing trace with hash 1024071024, now seen corresponding path program 6 times [2021-05-06 08:50:33,281 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:33,281 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1034409967] [2021-05-06 08:50:33,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:33,288 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:50:33,288 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1501655287] [2021-05-06 08:50:33,288 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:50:33,377 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-05-06 08:50:33,377 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 08:50:33,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-06 08:50:33,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:50:36,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:36,020 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:36,029 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:36,041 INFO L134 CoverageAnalysis]: Checked inductivity of 641 backedges. 93 proven. 19 refuted. 0 times theorem prover too weak. 529 trivial. 0 not checked. [2021-05-06 08:50:36,042 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:36,042 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1034409967] [2021-05-06 08:50:36,042 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:50:36,042 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1501655287] [2021-05-06 08:50:36,042 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1501655287] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 08:50:36,042 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 08:50:36,042 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-06 08:50:36,042 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1044332944] [2021-05-06 08:50:36,045 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 08:50:36,045 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:36,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 08:50:36,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-05-06 08:50:36,045 INFO L87 Difference]: Start difference. First operand 262 states and 303 transitions. Second operand has 10 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 4 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 4 states have call predecessors, (11), 3 states have call successors, (11) [2021-05-06 08:50:41,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:41,196 INFO L93 Difference]: Finished difference Result 285 states and 329 transitions. [2021-05-06 08:50:41,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 08:50:41,196 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 4 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 4 states have call predecessors, (11), 3 states have call successors, (11) Word has length 122 [2021-05-06 08:50:41,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:41,197 INFO L225 Difference]: With dead ends: 285 [2021-05-06 08:50:41,197 INFO L226 Difference]: Without dead ends: 285 [2021-05-06 08:50:41,198 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 2452.1ms TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-05-06 08:50:41,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285 states. [2021-05-06 08:50:41,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285 to 268. [2021-05-06 08:50:41,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 268 states, 179 states have (on average 1.1340782122905029) internal successors, (203), 186 states have internal predecessors, (203), 52 states have call successors, (52), 37 states have call predecessors, (52), 36 states have return successors, (50), 44 states have call predecessors, (50), 50 states have call successors, (50) [2021-05-06 08:50:41,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 305 transitions. [2021-05-06 08:50:41,202 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 305 transitions. Word has length 122 [2021-05-06 08:50:41,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:41,203 INFO L480 AbstractCegarLoop]: Abstraction has 268 states and 305 transitions. [2021-05-06 08:50:41,203 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 4 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 4 states have call predecessors, (11), 3 states have call successors, (11) [2021-05-06 08:50:41,203 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 305 transitions. [2021-05-06 08:50:41,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-05-06 08:50:41,203 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:41,203 INFO L523 BasicCegarLoop]: trace histogram [18, 17, 17, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 08:50:41,404 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,28 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:50:41,404 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:41,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:41,404 INFO L82 PathProgramCache]: Analyzing trace with hash -2136136717, now seen corresponding path program 7 times [2021-05-06 08:50:41,404 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:41,404 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [436924776] [2021-05-06 08:50:41,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:41,409 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:50:41,409 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2065329221] [2021-05-06 08:50:41,409 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:50:41,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:50:41,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-06 08:50:41,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:50:41,512 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,513 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,521 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,522 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,529 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,530 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,559 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,560 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,566 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,567 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,574 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,575 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,601 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,602 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,608 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,609 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,615 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,616 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,644 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,645 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,652 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,653 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,659 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,660 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,689 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,705 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,707 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,732 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,754 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,755 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,763 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,764 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,796 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,804 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,805 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,817 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:41,831 INFO L134 CoverageAnalysis]: Checked inductivity of 628 backedges. 39 proven. 93 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2021-05-06 08:50:41,831 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:41,831 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [436924776] [2021-05-06 08:50:41,831 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:50:41,832 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2065329221] [2021-05-06 08:50:41,832 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2065329221] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 08:50:41,832 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 08:50:41,832 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-05-06 08:50:41,832 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [23992424] [2021-05-06 08:50:41,833 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 08:50:41,833 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:41,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 08:50:41,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=153, Unknown=0, NotChecked=0, Total=182 [2021-05-06 08:50:41,834 INFO L87 Difference]: Start difference. First operand 268 states and 305 transitions. Second operand has 14 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 13 states have internal predecessors, (38), 8 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (19), 8 states have call predecessors, (19), 8 states have call successors, (19) [2021-05-06 08:50:42,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:42,265 INFO L93 Difference]: Finished difference Result 285 states and 324 transitions. [2021-05-06 08:50:42,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 08:50:42,277 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 13 states have internal predecessors, (38), 8 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (19), 8 states have call predecessors, (19), 8 states have call successors, (19) Word has length 123 [2021-05-06 08:50:42,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:42,279 INFO L225 Difference]: With dead ends: 285 [2021-05-06 08:50:42,279 INFO L226 Difference]: Without dead ends: 284 [2021-05-06 08:50:42,280 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 109 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 190.8ms TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2021-05-06 08:50:42,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 284 states. [2021-05-06 08:50:42,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 284 to 281. [2021-05-06 08:50:42,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 281 states, 187 states have (on average 1.1283422459893049) internal successors, (211), 196 states have internal predecessors, (211), 55 states have call successors, (55), 39 states have call predecessors, (55), 38 states have return successors, (52), 45 states have call predecessors, (52), 52 states have call successors, (52) [2021-05-06 08:50:42,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 281 states to 281 states and 318 transitions. [2021-05-06 08:50:42,285 INFO L78 Accepts]: Start accepts. Automaton has 281 states and 318 transitions. Word has length 123 [2021-05-06 08:50:42,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:42,285 INFO L480 AbstractCegarLoop]: Abstraction has 281 states and 318 transitions. [2021-05-06 08:50:42,285 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 13 states have internal predecessors, (38), 8 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (19), 8 states have call predecessors, (19), 8 states have call successors, (19) [2021-05-06 08:50:42,285 INFO L276 IsEmpty]: Start isEmpty. Operand 281 states and 318 transitions. [2021-05-06 08:50:42,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-05-06 08:50:42,286 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:42,286 INFO L523 BasicCegarLoop]: trace histogram [19, 18, 18, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 08:50:42,488 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:50:42,489 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:42,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:42,489 INFO L82 PathProgramCache]: Analyzing trace with hash -1840773263, now seen corresponding path program 6 times [2021-05-06 08:50:42,489 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:42,489 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2042074960] [2021-05-06 08:50:42,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:42,494 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:50:42,494 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1610384696] [2021-05-06 08:50:42,494 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:50:43,217 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2021-05-06 08:50:43,217 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 08:50:43,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-06 08:50:43,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:50:43,235 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,239 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,239 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,249 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,249 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,252 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,272 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,274 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,295 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,296 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,296 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,318 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,320 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,320 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,342 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,344 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,344 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,364 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,364 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,386 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,387 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,387 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,414 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,416 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,427 INFO L134 CoverageAnalysis]: Checked inductivity of 708 backedges. 36 proven. 612 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-05-06 08:50:43,427 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:43,427 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2042074960] [2021-05-06 08:50:43,427 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:50:43,427 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1610384696] [2021-05-06 08:50:43,427 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1610384696] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 08:50:43,428 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 08:50:43,428 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-06 08:50:43,428 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [599636572] [2021-05-06 08:50:43,428 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 08:50:43,428 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:43,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 08:50:43,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-06 08:50:43,429 INFO L87 Difference]: Start difference. First operand 281 states and 318 transitions. Second operand has 11 states, 11 states have (on average 5.181818181818182) internal successors, (57), 10 states have internal predecessors, (57), 10 states have call successors, (22), 10 states have call predecessors, (22), 8 states have return successors, (20), 8 states have call predecessors, (20), 9 states have call successors, (20) [2021-05-06 08:50:43,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:43,581 INFO L93 Difference]: Finished difference Result 355 states and 399 transitions. [2021-05-06 08:50:43,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 08:50:43,582 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 5.181818181818182) internal successors, (57), 10 states have internal predecessors, (57), 10 states have call successors, (22), 10 states have call predecessors, (22), 8 states have return successors, (20), 8 states have call predecessors, (20), 9 states have call successors, (20) Word has length 132 [2021-05-06 08:50:43,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:43,583 INFO L225 Difference]: With dead ends: 355 [2021-05-06 08:50:43,583 INFO L226 Difference]: Without dead ends: 353 [2021-05-06 08:50:43,583 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 51.6ms TimeCoverageRelationStatistics Valid=65, Invalid=117, Unknown=0, NotChecked=0, Total=182 [2021-05-06 08:50:43,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2021-05-06 08:50:43,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 338. [2021-05-06 08:50:43,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 338 states, 228 states have (on average 1.1271929824561404) internal successors, (257), 237 states have internal predecessors, (257), 65 states have call successors, (65), 46 states have call predecessors, (65), 44 states have return successors, (61), 54 states have call predecessors, (61), 61 states have call successors, (61) [2021-05-06 08:50:43,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 338 states to 338 states and 383 transitions. [2021-05-06 08:50:43,588 INFO L78 Accepts]: Start accepts. Automaton has 338 states and 383 transitions. Word has length 132 [2021-05-06 08:50:43,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:43,589 INFO L480 AbstractCegarLoop]: Abstraction has 338 states and 383 transitions. [2021-05-06 08:50:43,589 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 5.181818181818182) internal successors, (57), 10 states have internal predecessors, (57), 10 states have call successors, (22), 10 states have call predecessors, (22), 8 states have return successors, (20), 8 states have call predecessors, (20), 9 states have call successors, (20) [2021-05-06 08:50:43,589 INFO L276 IsEmpty]: Start isEmpty. Operand 338 states and 383 transitions. [2021-05-06 08:50:43,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-05-06 08:50:43,589 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:43,590 INFO L523 BasicCegarLoop]: trace histogram [19, 18, 18, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 08:50:43,795 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-05-06 08:50:43,795 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:43,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:43,795 INFO L82 PathProgramCache]: Analyzing trace with hash -1839670996, now seen corresponding path program 8 times [2021-05-06 08:50:43,796 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:43,796 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [973388957] [2021-05-06 08:50:43,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:43,800 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:50:43,800 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1536420817] [2021-05-06 08:50:43,800 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:50:43,873 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 08:50:43,873 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 08:50:43,875 INFO L263 TraceCheckSpWp]: Trace formula consists of 356 conjuncts, 54 conjunts are in the unsatisfiable core [2021-05-06 08:50:43,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:50:43,919 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,927 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,927 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,934 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,935 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,960 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,961 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,967 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,968 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,974 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:43,975 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:44,009 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:44,017 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:44,024 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:44,025 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:44,032 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:44,033 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:44,062 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:44,064 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:44,072 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:44,074 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:44,082 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:44,083 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:44,134 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:44,136 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:44,152 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:44,153 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:44,216 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:44,218 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:44,236 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:44,238 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:44,332 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:44,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:44,349 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:44,351 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:44,428 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:44,430 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:44,447 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:44,463 INFO L134 CoverageAnalysis]: Checked inductivity of 711 backedges. 36 proven. 63 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2021-05-06 08:50:44,463 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:44,463 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [973388957] [2021-05-06 08:50:44,463 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:50:44,463 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1536420817] [2021-05-06 08:50:44,464 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1536420817] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 08:50:44,464 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 08:50:44,464 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2021-05-06 08:50:44,464 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [873511196] [2021-05-06 08:50:44,464 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 08:50:44,464 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:44,464 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 08:50:44,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=260, Unknown=0, NotChecked=0, Total=306 [2021-05-06 08:50:44,465 INFO L87 Difference]: Start difference. First operand 338 states and 383 transitions. Second operand has 18 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 16 states have internal predecessors, (39), 9 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (20), 9 states have call predecessors, (20), 8 states have call successors, (20) [2021-05-06 08:50:44,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:44,966 INFO L93 Difference]: Finished difference Result 368 states and 417 transitions. [2021-05-06 08:50:44,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 08:50:44,969 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 16 states have internal predecessors, (39), 9 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (20), 9 states have call predecessors, (20), 8 states have call successors, (20) Word has length 132 [2021-05-06 08:50:44,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:44,970 INFO L225 Difference]: With dead ends: 368 [2021-05-06 08:50:44,970 INFO L226 Difference]: Without dead ends: 354 [2021-05-06 08:50:44,970 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 308.7ms TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2021-05-06 08:50:44,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 354 states. [2021-05-06 08:50:44,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 354 to 344. [2021-05-06 08:50:44,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 344 states, 232 states have (on average 1.125) internal successors, (261), 241 states have internal predecessors, (261), 67 states have call successors, (67), 46 states have call predecessors, (67), 44 states have return successors, (63), 56 states have call predecessors, (63), 63 states have call successors, (63) [2021-05-06 08:50:44,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 344 states to 344 states and 391 transitions. [2021-05-06 08:50:44,976 INFO L78 Accepts]: Start accepts. Automaton has 344 states and 391 transitions. Word has length 132 [2021-05-06 08:50:44,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:44,976 INFO L480 AbstractCegarLoop]: Abstraction has 344 states and 391 transitions. [2021-05-06 08:50:44,976 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 16 states have internal predecessors, (39), 9 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (20), 9 states have call predecessors, (20), 8 states have call successors, (20) [2021-05-06 08:50:44,976 INFO L276 IsEmpty]: Start isEmpty. Operand 344 states and 391 transitions. [2021-05-06 08:50:44,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-05-06 08:50:44,977 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:44,977 INFO L523 BasicCegarLoop]: trace histogram [19, 18, 18, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 08:50:45,193 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:50:45,193 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:45,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:45,193 INFO L82 PathProgramCache]: Analyzing trace with hash -1628320083, now seen corresponding path program 1 times [2021-05-06 08:50:45,194 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:45,194 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [668412667] [2021-05-06 08:50:45,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:45,198 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:50:45,198 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [508839444] [2021-05-06 08:50:45,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:50:45,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 08:50:45,288 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 56 conjunts are in the unsatisfiable core [2021-05-06 08:50:45,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:50:45,431 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:45,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:45,461 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:45,462 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:45,471 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:45,472 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:45,506 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:45,509 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:45,521 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:45,523 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:45,588 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:45,590 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:45,601 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:45,603 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:45,664 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:45,666 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:45,677 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:45,679 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:45,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:45,802 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:45,823 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:45,842 INFO L134 CoverageAnalysis]: Checked inductivity of 711 backedges. 88 proven. 107 refuted. 0 times theorem prover too weak. 516 trivial. 0 not checked. [2021-05-06 08:50:45,842 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 08:50:45,842 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [668412667] [2021-05-06 08:50:45,842 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 08:50:45,842 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [508839444] [2021-05-06 08:50:45,842 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [508839444] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 08:50:45,842 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 08:50:45,842 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-05-06 08:50:45,842 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1408183127] [2021-05-06 08:50:45,843 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 08:50:45,843 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 08:50:45,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 08:50:45,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=208, Unknown=0, NotChecked=0, Total=240 [2021-05-06 08:50:45,843 INFO L87 Difference]: Start difference. First operand 344 states and 391 transitions. Second operand has 16 states, 16 states have (on average 2.625) internal successors, (42), 15 states have internal predecessors, (42), 9 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (20), 8 states have call predecessors, (20), 8 states have call successors, (20) [2021-05-06 08:50:46,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 08:50:46,644 INFO L93 Difference]: Finished difference Result 373 states and 418 transitions. [2021-05-06 08:50:46,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 08:50:46,648 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.625) internal successors, (42), 15 states have internal predecessors, (42), 9 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (20), 8 states have call predecessors, (20), 8 states have call successors, (20) Word has length 132 [2021-05-06 08:50:46,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 08:50:46,649 INFO L225 Difference]: With dead ends: 373 [2021-05-06 08:50:46,649 INFO L226 Difference]: Without dead ends: 359 [2021-05-06 08:50:46,649 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 115 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 311.1ms TimeCoverageRelationStatistics Valid=43, Invalid=263, Unknown=0, NotChecked=0, Total=306 [2021-05-06 08:50:46,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 359 states. [2021-05-06 08:50:46,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 359 to 335. [2021-05-06 08:50:46,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 335 states, 226 states have (on average 1.1238938053097345) internal successors, (254), 234 states have internal predecessors, (254), 64 states have call successors, (64), 46 states have call predecessors, (64), 44 states have return successors, (60), 54 states have call predecessors, (60), 60 states have call successors, (60) [2021-05-06 08:50:46,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 335 states to 335 states and 378 transitions. [2021-05-06 08:50:46,654 INFO L78 Accepts]: Start accepts. Automaton has 335 states and 378 transitions. Word has length 132 [2021-05-06 08:50:46,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 08:50:46,655 INFO L480 AbstractCegarLoop]: Abstraction has 335 states and 378 transitions. [2021-05-06 08:50:46,655 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.625) internal successors, (42), 15 states have internal predecessors, (42), 9 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (20), 8 states have call predecessors, (20), 8 states have call successors, (20) [2021-05-06 08:50:46,655 INFO L276 IsEmpty]: Start isEmpty. Operand 335 states and 378 transitions. [2021-05-06 08:50:46,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-05-06 08:50:46,655 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 08:50:46,655 INFO L523 BasicCegarLoop]: trace histogram [20, 19, 19, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 08:50:46,860 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-05-06 08:50:46,861 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 08:50:46,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 08:50:46,861 INFO L82 PathProgramCache]: Analyzing trace with hash 1133423071, now seen corresponding path program 9 times [2021-05-06 08:50:46,861 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 08:50:46,861 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1112826524] [2021-05-06 08:50:46,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 08:50:46,865 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 08:50:46,865 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [387811660] [2021-05-06 08:50:46,866 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 08:50:46,941 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-06 08:50:46,941 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 08:50:46,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 45 conjunts are in the unsatisfiable core [2021-05-06 08:50:46,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 08:50:48,237 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:48,238 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:48,239 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 08:50:48,240 WARN L159 QuantifierPusher]: Ignoring assumption.