Author: teemperor Date: Thu Jul 11 12:27:33 2019 New Revision: 365813 URL: http://llvm.org/viewvc/llvm-project?rev=365813&view=rev Log: [lldb] Make TestDeletedExecutable more reliable
Summary: It seems that calling Popen can return to the caller before the started process has read all the needed information from its executable. This means that in case we delete the executable while the process is still starting up, this test will create a zombie process which in turn leads to a failing test. On my macOS system this happens quite frequently. This patch fixes this by letting the test synchronize with the inferior after it has started up. Reviewers: davide Reviewed By: davide Subscribers: labath, friss, lldb-commits Tags: #lldb Differential Revision: https://reviews.llvm.org/D64546 Modified: lldb/trunk/packages/Python/lldbsuite/test/functionalities/deleted-executable/TestDeletedExecutable.py lldb/trunk/packages/Python/lldbsuite/test/functionalities/deleted-executable/main.cpp Modified: lldb/trunk/packages/Python/lldbsuite/test/functionalities/deleted-executable/TestDeletedExecutable.py URL: http://llvm.org/viewvc/llvm-project/lldb/trunk/packages/Python/lldbsuite/test/functionalities/deleted-executable/TestDeletedExecutable.py?rev=365813&r1=365812&r2=365813&view=diff ============================================================================== --- lldb/trunk/packages/Python/lldbsuite/test/functionalities/deleted-executable/TestDeletedExecutable.py (original) +++ lldb/trunk/packages/Python/lldbsuite/test/functionalities/deleted-executable/TestDeletedExecutable.py Thu Jul 11 12:27:33 2019 @@ -1,5 +1,5 @@ """ -Test process attach/resume. +Test process attach when executable was deleted. """ from __future__ import print_function @@ -24,8 +24,22 @@ class TestDeletedExecutable(TestBase): self.build() exe = self.getBuildArtifact("a.out") - popen = self.spawnSubprocess(exe) + # Use a file as a synchronization point between test and inferior. + pid_file_path = lldbutil.append_to_process_working_directory(self, + "token_pid_%d" % (int(os.getpid()))) + self.addTearDownHook( + lambda: self.run_platform_command( + "rm %s" % + (pid_file_path))) + + # Spawn a new process + popen = self.spawnSubprocess(exe, [pid_file_path]) self.addTearDownHook(self.cleanupSubprocesses) + + # Wait until process has fully started up. + pid = lldbutil.wait_for_file_on_target(self, pid_file_path) + + # Now we can safely remove the executable and test if we can attach. os.remove(exe) self.runCmd("process attach -p " + str(popen.pid)) Modified: lldb/trunk/packages/Python/lldbsuite/test/functionalities/deleted-executable/main.cpp URL: http://llvm.org/viewvc/llvm-project/lldb/trunk/packages/Python/lldbsuite/test/functionalities/deleted-executable/main.cpp?rev=365813&r1=365812&r2=365813&view=diff ============================================================================== --- lldb/trunk/packages/Python/lldbsuite/test/functionalities/deleted-executable/main.cpp (original) +++ lldb/trunk/packages/Python/lldbsuite/test/functionalities/deleted-executable/main.cpp Thu Jul 11 12:27:33 2019 @@ -1,9 +1,15 @@ #include <chrono> +#include <fstream> #include <thread> -int main(int argc, char const *argv[]) -{ +int main(int argc, char const *argv[]) { lldb_enable_attach(); - std::this_thread::sleep_for(std::chrono::seconds(30)); + { + // Create file to signal that this process has started up. + std::ofstream f; + f.open(argv[1]); + } + + std::this_thread::sleep_for(std::chrono::seconds(60)); } _______________________________________________ lldb-commits mailing list lldb-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-commits
