/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AbstractInterpretationInline.xml -s ../../../trunk/examples/settings/ai/thread-modular/svcomp-Reach-32bit-Automizer_Default+AIv2_OCT_FLOW_SENSITIVE_FILTERED.epf -i ../../../trunk/examples/concurrent/bpl/regression/fork_in_loop.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.2-wip.fs.absint-concur-c9b613c-m [2022-09-21 14:26:14,095 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-09-21 14:26:14,097 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-09-21 14:26:14,147 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-09-21 14:26:14,147 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-09-21 14:26:14,150 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-09-21 14:26:14,153 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-09-21 14:26:14,156 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-09-21 14:26:14,157 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-09-21 14:26:14,161 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-09-21 14:26:14,162 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-09-21 14:26:14,162 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-09-21 14:26:14,163 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-09-21 14:26:14,163 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-09-21 14:26:14,164 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-09-21 14:26:14,165 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-09-21 14:26:14,165 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-09-21 14:26:14,166 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-09-21 14:26:14,167 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-09-21 14:26:14,168 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-09-21 14:26:14,169 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-09-21 14:26:14,172 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-09-21 14:26:14,176 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-09-21 14:26:14,178 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-09-21 14:26:14,185 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-09-21 14:26:14,185 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-09-21 14:26:14,186 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-09-21 14:26:14,187 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-09-21 14:26:14,187 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-09-21 14:26:14,188 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-09-21 14:26:14,188 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-09-21 14:26:14,189 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-09-21 14:26:14,190 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-09-21 14:26:14,191 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-09-21 14:26:14,192 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-09-21 14:26:14,192 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-09-21 14:26:14,193 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-09-21 14:26:14,193 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-09-21 14:26:14,193 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-09-21 14:26:14,194 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-09-21 14:26:14,194 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-09-21 14:26:14,195 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/thread-modular/svcomp-Reach-32bit-Automizer_Default+AIv2_OCT_FLOW_SENSITIVE_FILTERED.epf [2022-09-21 14:26:14,227 INFO L113 SettingsManager]: Loading preferences was successful [2022-09-21 14:26:14,227 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-09-21 14:26:14,228 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-09-21 14:26:14,228 INFO L138 SettingsManager]: * Log level for plugins=info [2022-09-21 14:26:14,228 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-09-21 14:26:14,228 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-09-21 14:26:14,229 INFO L138 SettingsManager]: * User list type=DISABLED [2022-09-21 14:26:14,229 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2022-09-21 14:26:14,229 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2022-09-21 14:26:14,229 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-09-21 14:26:14,230 INFO L138 SettingsManager]: * Computation of Interferences for Sequential Abstract Interpretation of each procedure=FLOW_SENSITIVE_FILTERED [2022-09-21 14:26:14,230 INFO L138 SettingsManager]: * Abstract domain=OctagonDomain [2022-09-21 14:26:14,230 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-09-21 14:26:14,230 INFO L138 SettingsManager]: * sizeof long=4 [2022-09-21 14:26:14,231 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-09-21 14:26:14,231 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-09-21 14:26:14,231 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-09-21 14:26:14,231 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-09-21 14:26:14,231 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-09-21 14:26:14,231 INFO L138 SettingsManager]: * sizeof long double=12 [2022-09-21 14:26:14,231 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-09-21 14:26:14,232 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-09-21 14:26:14,232 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-09-21 14:26:14,232 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2022-09-21 14:26:14,232 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-09-21 14:26:14,232 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-09-21 14:26:14,232 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-09-21 14:26:14,232 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-09-21 14:26:14,232 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-09-21 14:26:14,233 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2022-09-21 14:26:14,233 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-09-21 14:26:14,233 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2022-09-21 14:26:14,441 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-09-21 14:26:14,459 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-09-21 14:26:14,461 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-09-21 14:26:14,462 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2022-09-21 14:26:14,463 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2022-09-21 14:26:14,464 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/fork_in_loop.bpl [2022-09-21 14:26:14,464 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/fork_in_loop.bpl' [2022-09-21 14:26:14,491 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-09-21 14:26:14,493 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-09-21 14:26:14,493 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-09-21 14:26:14,493 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-09-21 14:26:14,494 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-09-21 14:26:14,503 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.09 02:26:14" (1/1) ... [2022-09-21 14:26:14,508 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.09 02:26:14" (1/1) ... [2022-09-21 14:26:14,513 INFO L138 Inliner]: procedures = 2, calls = 2, calls flagged for inlining = 0, calls inlined = 0, statements flattened = 0 [2022-09-21 14:26:14,515 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-09-21 14:26:14,516 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-09-21 14:26:14,516 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-09-21 14:26:14,516 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-09-21 14:26:14,521 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.09 02:26:14" (1/1) ... [2022-09-21 14:26:14,521 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.09 02:26:14" (1/1) ... [2022-09-21 14:26:14,522 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.09 02:26:14" (1/1) ... [2022-09-21 14:26:14,522 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.09 02:26:14" (1/1) ... [2022-09-21 14:26:14,523 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.09 02:26:14" (1/1) ... [2022-09-21 14:26:14,526 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.09 02:26:14" (1/1) ... [2022-09-21 14:26:14,526 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.09 02:26:14" (1/1) ... [2022-09-21 14:26:14,527 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-09-21 14:26:14,527 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-09-21 14:26:14,527 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-09-21 14:26:14,528 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-09-21 14:26:14,531 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 21.09 02:26:14" (1/1) ... [2022-09-21 14:26:14,537 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-09-21 14:26:14,544 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-09-21 14:26:14,561 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-09-21 14:26:14,568 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-09-21 14:26:14,603 INFO L124 BoogieDeclarations]: Specification and implementation of procedure foo given in one single declaration [2022-09-21 14:26:14,604 INFO L130 BoogieDeclarations]: Found specification of procedure foo [2022-09-21 14:26:14,604 INFO L138 BoogieDeclarations]: Found implementation of procedure foo [2022-09-21 14:26:14,604 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-09-21 14:26:14,604 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-09-21 14:26:14,605 WARN L208 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2022-09-21 14:26:14,645 INFO L234 CfgBuilder]: Building ICFG [2022-09-21 14:26:14,647 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-09-21 14:26:14,725 INFO L275 CfgBuilder]: Performing block encoding [2022-09-21 14:26:14,732 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-09-21 14:26:14,732 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2022-09-21 14:26:14,735 INFO L202 PluginConnector]: Adding new model fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 02:26:14 BoogieIcfgContainer [2022-09-21 14:26:14,739 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-09-21 14:26:14,741 INFO L113 PluginConnector]: ------------------------Abstract Interpretation---------------------------- [2022-09-21 14:26:14,741 INFO L271 PluginConnector]: Initializing Abstract Interpretation... [2022-09-21 14:26:14,741 INFO L275 PluginConnector]: Abstract Interpretation initialized [2022-09-21 14:26:14,742 INFO L185 PluginConnector]: Executing the observer AbstractInterpretationRcfgObserver from plugin Abstract Interpretation for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 02:26:14" (1/1) ... [2022-09-21 14:26:14,801 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-09-21 14:26:14,801 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-09-21 14:26:14,804 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-09-21 14:26:14,808 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-09-21 14:26:14,844 INFO L129 ointEngineConcurrent]: Starting fixpoint engine with domain OctagonDomain (maxUnwinding=3, maxParallelStates=2) [2022-09-21 14:26:14,845 INFO L155 ointEngineConcurrent]: Starting outer Fixpoint iteration number 1 [2022-09-21 14:26:14,846 INFO L115 FixpointEngine]: Starting fixpoint engine with domain OctagonDomain (maxUnwinding=3, maxParallelStates=2) [2022-09-21 14:26:14,882 INFO L115 FixpointEngine]: Starting fixpoint engine with domain OctagonDomain (maxUnwinding=3, maxParallelStates=2) [2022-09-21 14:26:14,886 INFO L320 AbstractInterpreter]: Some error location(s) were reachable [2022-09-21 14:26:14,895 INFO L329 AbstractInterpreter]: No benchmarks available [2022-09-21 14:26:14,896 INFO L132 PluginConnector]: ------------------------ END Abstract Interpretation---------------------------- [2022-09-21 14:26:14,897 INFO L158 Benchmark]: Toolchain (without parser) took 404.03ms. Allocated memory is still 187.7MB. Free memory was 147.0MB in the beginning and 128.4MB in the end (delta: 18.7MB). Peak memory consumption was 18.9MB. Max. memory is 8.0GB. [2022-09-21 14:26:14,898 INFO L158 Benchmark]: Boogie PL CUP Parser took 0.11ms. Allocated memory is still 187.7MB. Free memory is still 148.0MB. There was no memory consumed. Max. memory is 8.0GB. [2022-09-21 14:26:14,899 INFO L158 Benchmark]: Boogie Procedure Inliner took 21.57ms. Allocated memory is still 187.7MB. Free memory was 147.0MB in the beginning and 145.4MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. [2022-09-21 14:26:14,899 INFO L158 Benchmark]: Boogie Preprocessor took 11.08ms. Allocated memory is still 187.7MB. Free memory was 145.4MB in the beginning and 144.5MB in the end (delta: 924.9kB). Peak memory consumption was 1.0MB. Max. memory is 8.0GB. [2022-09-21 14:26:14,900 INFO L158 Benchmark]: RCFGBuilder took 212.11ms. Allocated memory is still 187.7MB. Free memory was 144.5MB in the beginning and 136.2MB in the end (delta: 8.3MB). Peak memory consumption was 8.4MB. Max. memory is 8.0GB. [2022-09-21 14:26:14,901 INFO L158 Benchmark]: Abstract Interpretation took 155.17ms. Allocated memory is still 187.7MB. Free memory was 136.0MB in the beginning and 128.4MB in the end (delta: 7.7MB). Peak memory consumption was 7.3MB. Max. memory is 8.0GB. [2022-09-21 14:26:14,903 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * Boogie PL CUP Parser took 0.11ms. Allocated memory is still 187.7MB. Free memory is still 148.0MB. There was no memory consumed. Max. memory is 8.0GB. * Boogie Procedure Inliner took 21.57ms. Allocated memory is still 187.7MB. Free memory was 147.0MB in the beginning and 145.4MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. * Boogie Preprocessor took 11.08ms. Allocated memory is still 187.7MB. Free memory was 145.4MB in the beginning and 144.5MB in the end (delta: 924.9kB). Peak memory consumption was 1.0MB. Max. memory is 8.0GB. * RCFGBuilder took 212.11ms. Allocated memory is still 187.7MB. Free memory was 144.5MB in the beginning and 136.2MB in the end (delta: 8.3MB). Peak memory consumption was 8.4MB. Max. memory is 8.0GB. * Abstract Interpretation took 155.17ms. Allocated memory is still 187.7MB. Free memory was 136.0MB in the beginning and 128.4MB in the end (delta: 7.7MB). Peak memory consumption was 7.3MB. Max. memory is 8.0GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: - UnprovableResult [Line: 35]: Unable to prove that assertion always holds Unable to prove that assertion always holds Reason: abstract domain could reach this error location. Possible FailurePath: [L20] 0 x := 1; [L22] COND TRUE 0 x < 2 [L23] FORK 0 fork x foo(x); [L24] 0 x := x + 1; [L22] COND FALSE 0 !(x < 2) [L26] 0 x := 1; [L27] JOIN 0 join x; [L28] COND TRUE 0 x < 3 [L29] FORK 0 fork x foo(x); [L30] 0 x := x + 1; [L28] COND TRUE 0 x < 3 [L29] FORK 0 fork x foo(x); [L30] 0 x := x + 1; [L28] COND FALSE 0 !(x < 3) [L33] JOIN 0 join 1; [L34] JOIN 0 join 2; [L35] 0 assert false; RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces [2022-09-21 14:26:14,931 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-09-21 14:26:15,132 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...