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Type:
Bug
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Resolution: Done
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Priority:
Blocker - P1
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Affects Version/s: 1.1.4
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Component/s: None
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None
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Fully Compatible
In 1.1.4, a network error at certain point(s) in the TLS code path causes the driver to spin infinitely.
To reproduce, first install pip, then mongo-mockup-db:
$ wget https://bootstrap.pypa.io/get-pip.py $ sudo python get-pip.py $ sudo python -m pip install https://github.com/ajdavis/mongo-mockup-db/archive/master.zip
Then save this in a Python file and run it like "python file.py":
from mockupdb import MockupDB, Command server = MockupDB(port=27017, auto_ismaster=True, verbose=True, ssl=True) server.autoresponds('ping') server.run() server.receives(Command('listCollections'), timeout=100).hangup()
That'll wait up to 100 seconds for a driver to issue listCollections, then when it receives the command it hangs up.
I've started this mock server and run this file, using the C Driver built from master (0bd7850609):
#include <mongoc.h> int main (int argc, char *argv[]) { mongoc_client_t *client; mongoc_database_t *db; bson_error_t error; mongoc_ssl_opt_t ssl_options = { 0 }; const char *uristr = "mongodb://127.0.0.1/?ssl=true"; char **names = NULL; int i = 0; mongoc_init (); if (argc > 1) { uristr = argv [1]; } client = mongoc_client_new (uristr); ssl_options.weak_cert_validation = true; mongoc_client_set_ssl_opts (client, &ssl_options); if (!client) { fprintf (stderr, "Failed to parse URI.\n"); return EXIT_FAILURE; } db = mongoc_client_get_database (client, "test"); if ((names = mongoc_database_get_collection_names (db, &error))) { printf ("got collection names\n"); for (i = 0; names [i]; i++) printf ("collection: %s\n", names [i]); bson_strfreev (names); } else { fprintf (stderr, "Command failed: %s\n", error.message); } mongoc_database_destroy (db); mongoc_client_destroy (client); mongoc_cleanup (); return EXIT_SUCCESS; }
The Python server hangs up, and the client hangs and spins the CPU.
If I remove "ssl=True" from the Python and "ssl=true" from the C, and rerun both sides, I instead get an immediate log about the hangup from the C Driver and it exits as desired:
stream: Failure to buffer 4 bytes: Failed to buffer 4 bytes within 300000 milliseconds.
The C code also gets a non-NULL return value from mongoc_database_get_collection_names, which is filed as a separate bug CDRIVER-618.