Ken Giusti created DISPATCH-2129:
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Summary: shutdown race accessing core->running flag
Key: DISPATCH-2129
URL: https://issues.apache.org/jira/browse/DISPATCH-2129
Project: Qpid Dispatch
Issue Type: Bug
Components: Router Node
Affects Versions: 1.16.0
Reporter: Ken Giusti
Assignee: Michael Goulish
Fix For: 1.17.0
Low priority, but nice to clean up so we can remove the suppression for
qdr_core_free.
The core->running flag is set false by the main thread during shutdown. The
flag is checked by the core thread as an indication that the core thread should
exit its main loop.
A non-racy approach would be to instead have the main thread queue an action to
the core thread to cause it to exit the main loop (by setting the core->running
flag to false).
65: ==================
65: WARNING: ThreadSanitizer: data race (pid=613021)
65: Write of size 1 at 0x7b6400035220 by main thread:
65: #0 qdr_core_free
/home/kgiusti/work/dispatch/qpid-dispatch/src/router_core/router_core.c:140
(libqpid-dispatch.so+0xf0484)
65: #1 qd_router_free
/home/kgiusti/work/dispatch/qpid-dispatch/src/router_node.c:2160
(libqpid-dispatch.so+0x12870e)
65: #2 qd_dispatch_free
/home/kgiusti/work/dispatch/qpid-dispatch/src/dispatch.c:375
(libqpid-dispatch.so+0x81dfd)
65: #3 main_process
/home/kgiusti/work/dispatch/qpid-dispatch/router/src/main.c:119
(qdrouterd+0x402750)
65: #4 main /home/kgiusti/work/dispatch/qpid-dispatch/router/src/main.c:369
(qdrouterd+0x403557)
65:
65: Previous read of size 1 at 0x7b6400035220 by thread T1:
65: #0 router_core_thread
/home/kgiusti/work/dispatch/qpid-dispatch/src/router_core/router_core_thread.c:210
(libqpid-dispatch.so+0xfb416)
65: #1 _thread_init
/home/kgiusti/work/dispatch/qpid-dispatch/src/posix/threading.c:172
(libqpid-dispatch.so+0xad37a)
65: #2 <null> <null> (libtsan.so.0+0x2d33f)
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