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https://issues.apache.org/jira/browse/DISPATCH-2130?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ken Giusti updated DISPATCH-2130:
---------------------------------
Fix Version/s: (was: 1.17.0)
1.18.0
> python lock inversion deadlock
> ------------------------------
>
> Key: DISPATCH-2130
> URL: https://issues.apache.org/jira/browse/DISPATCH-2130
> Project: Qpid Dispatch
> Issue Type: Bug
> Components: Router Node
> Affects Versions: 1.16.0
> Reporter: Ken Giusti
> Assignee: Ken Giusti
> Priority: Major
> Labels: deadlock, tsan
> Fix For: 1.18.0
>
>
> The python lock is a top-level lock: no other locks should be held when
> taking the python lock.
> The python lock is held for as long as the thread is running in python. The
> python code often calls back into C, which takes locks as necessary (timers,
> server lock, whatever).
> Debug code should be added to enforce this.
> TSAN deadlock trace:
> 21: Mutex M253 acquired here while holding mutex M13 in main thread:
> 21: #0 pthread_mutex_lock <null> (libtsan.so.0+0x528ac)
> <M253 == timer lock == qd_server->lock>
> 21: #1 sys_mutex_lock
> /home/kgiusti/work/dispatch/qpid-dispatch/src/posix/threading.c:57
> (libqpid-dispatch.so+0xacee5)
> 21: #2 qd_timer_schedule
> /home/kgiusti/work/dispatch/qpid-dispatch/src/timer.c:216
> (libqpid-dispatch.so+0x1350fe)
> 21: #3 qd_router_setup_late
> /home/kgiusti/work/dispatch/qpid-dispatch/src/router_node.c:2144
> (libqpid-dispatch.so+0x128656)
> 21: #4 ffi_call_unix64 <null> (libffi.so.6+0x6aef)
> 21: #5 main_process
> /home/kgiusti/work/dispatch/qpid-dispatch/router/src/main.c:97
> (qdrouterd+0x402697)
> 21: #6 main /home/kgiusti/work/dispatch/qpid-dispatch/router/src/main.c:369
> (qdrouterd+0x403557)
> 21:
> 21: Mutex M13 previously acquired by the same thread here:
> 21: #0 pthread_mutex_lock <null> (libtsan.so.0+0x528ac)
> <M13 == python ilock>
> 21: #1 sys_mutex_lock
> /home/kgiusti/work/dispatch/qpid-dispatch/src/posix/threading.c:57
> (libqpid-dispatch.so+0xacee5)
> 21: #2 qd_python_lock
> /home/kgiusti/work/dispatch/qpid-dispatch/src/python_embedded.c:902
> (libqpid-dispatch.so+0xb070e)
> 21: #3 qd_dispatch_load_config
> /home/kgiusti/work/dispatch/qpid-dispatch/src/dispatch.c:129
> (libqpid-dispatch.so+0x80ad2)
> 21: #4 main_process
> /home/kgiusti/work/dispatch/qpid-dispatch/router/src/main.c:97
> (qdrouterd+0x402697)
> 21: #5 main /home/kgiusti/work/dispatch/qpid-dispatch/router/src/main.c:369
> (qdrouterd+0x403557)
>
> ---------------------------
>
> 21: Mutex M13 acquired here while holding mutex M253 in thread T4:
> 21: #0 pthread_mutex_lock <null> (libtsan.so.0+0x528ac)
> <M13 == python ilock>
> 21: #1 sys_mutex_lock
> /home/kgiusti/work/dispatch/qpid-dispatch/src/posix/threading.c:57
> (libqpid-dispatch.so+0xacee5)
> 21: #2 qd_python_lock
> /home/kgiusti/work/dispatch/qpid-dispatch/src/python_embedded.c:902
> (libqpid-dispatch.so+0xb070e)
> 21: #3 qd_policy_socket_close
> /home/kgiusti/work/dispatch/qpid-dispatch/src/policy.c:296
> (libqpid-dispatch.so+0xa3a8e)
> 21: #4 qd_connection_free
> /home/kgiusti/work/dispatch/qpid-dispatch/src/server.c:925
> (libqpid-dispatch.so+0x12f703)
> 21: #5 thread_run /home/kgiusti/work/dispatch/qpid-dispatch/src/server.c:1127
> (libqpid-dispatch.so+0x13069e)
> 21: #6 _thread_init
> /home/kgiusti/work/dispatch/qpid-dispatch/src/posix/threading.c:172
> (libqpid-dispatch.so+0xad37a)
> 21: #7 <null> <null> (libtsan.so.0+0x2d33f)
> 21:
> 21: Mutex M253 previously acquired by the same thread here:
> 21: #0 pthread_mutex_lock <null> (libtsan.so.0+0x528ac)
> <M253 == qd_server->lock>
> 21: #1 sys_mutex_lock
> /home/kgiusti/work/dispatch/qpid-dispatch/src/posix/threading.c:57
> (libqpid-dispatch.so+0xacee5)
> 21: #2 qd_connection_free
> /home/kgiusti/work/dispatch/qpid-dispatch/src/server.c:920
> (libqpid-dispatch.so+0x12f48f)
> 21: #3 thread_run /home/kgiusti/work/dispatch/qpid-dispatch/src/server.c:1127
> (libqpid-dispatch.so+0x13069e)
> 21: #4 _thread_init
> /home/kgiusti/work/dispatch/qpid-dispatch/src/posix/threading.c:172
> (libqpid-dispatch.so+0xad37a)
> 21: #5 <null> <null> (libtsan.so.0+0x2d33f)
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