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obscuremind
9c3db348f2
The shipped nginx is statically linked. At a worker's graceful exit, exit() runs the global destructors, which deregister the binary's unwind tables (__deregister_frame_info_bases), while the thread pool's threads are still unwinding out of pthread_exit(): ngx_thread_pool_destroy() waits for each thread's flag, set just before pthread_exit(), not for the thread. A thread that finds no frame info aborts (uw_init_context_1 -> abort). A core from the test MAIN shows both stacks; nginx's error.log called it 'worker process ... exited on signal 6', about one reload in eleven (9 in 100 under traffic). The pool did no work anyway: max_queue=0 refused every task, so aio threads never ran. Both nginx.conf files drop thread_pool and aio threads; segments still go out by sendfile.
27 lines
1.2 KiB
PHP
27 lines
1.2 KiB
PHP
<?php
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use PHPUnit\Framework\TestCase;
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/**
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* No nginx thread pool. The shipped nginx is statically linked: at a
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* worker's graceful exit, exit() runs the global destructors, which
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* deregister the binary's unwind tables (__deregister_frame_info_bases),
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* while the pool's threads are still unwinding out of pthread_exit()
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* (ngx_thread_pool_destroy() waits for each thread's flag, set just before
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* pthread_exit(), not for the thread). A thread that finds no frame info
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* aborts: signal 6 in "worker process is shutting down", about one reload
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* in eleven on the test MAIN (a core shows the two stacks). The pool did no
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* work anyway: max_queue=0 refused every task.
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*/
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final class NginxNoThreadPoolTest extends TestCase {
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public function testNoThreadPoolOrThreadedAio(): void {
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$rRoot = dirname(__DIR__, 2);
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foreach (['src/bin/nginx/conf/nginx.conf', 'lb_configs/nginx.conf'] as $rFile) {
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$rConf = (string) file_get_contents($rRoot . '/' . $rFile);
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$this->assertDoesNotMatchRegularExpression('/^\s*thread_pool\b/m', $rConf, $rFile);
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$this->assertDoesNotMatchRegularExpression('/^\s*aio\s+threads\b/m', $rConf, $rFile);
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$this->assertMatchesRegularExpression('/^\s*sendfile on;$/m', $rConf, $rFile . ': segments still go out by sendfile');
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}
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}
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}
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