- **status**: unassigned --> accepted
- **assigned_to**: Hans Nordebäck
---
** [tickets:#2746] mds: mds test is not thread safe**
**Status:** accepted
**Milestone:** 5.18.01
**Created:** Thu Dec 21, 2017 07:25 AM UTC by Hans Nordebäck
**Last Updated:** Thu Dec 21, 2017 07:25 AM UTC
**Owner:** Hans Nordebäck
there are several data races related to e.g. svc_to_mds_info structure, one
example below:
Possible data race during write of size 4 at 0x35F72C by thread #4
==769== Locks held: none
==769== at 0x129E05: memset (string3.h:84)
==769== by 0x129E05: mds_service_retrieve (mdstipc_conf.c:1619)
==769== by 0x1120C4: tet_vdest_rcvr_thread (mdstipc_api.c:5584)
==769== by 0x4C30FA6: ??? (in
/hostfs/rootfs/usr/lib64/valgrind/vgpreload_helgrind-amd64-linux.so)
==769== by 0x50CC183: start_thread (pthread_create.c:312)
==769== by 0x53DFFFC: clone (clone.S:111)
==769==
==769== This conflicts with a previous write of size 4 by thread #1
==769== Locks held: none
==769== at 0x12A0F3: memset (string3.h:84)
==769== by 0x12A0F3: mds_service_uninstall (mdstipc_conf.c:435)
==769== by 0x116547: tet_cleanup_setup (mdstipc_api.c:2726)
==769== by 0x11BCBF: tet_send_response_ack_tp_5 (mdstipc_api.c:6726)
==769== by 0x12B928: run_test_case (utest.c:178)
==769== by 0x12BD6D: test_run (utest.c:226)
==769== by 0x10DBA8: main (mdstest.c:92)
==769== Address 0x35f72c is 12 bytes inside data symbol "svc_to_mds_info"
==769==
==769==
this is likely the cause why some mds tests sometimes fails "randomly". The
mds tests has to be thread safe and helgrind can be used to identify these
thread synchronization issues.
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