Details
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Bug
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Status: Closed (View Workflow)
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Major
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Resolution: Fixed
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2.5.13
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None
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MXS-SPRINT-137
Description
It is possible for the binlogrouter to end up in a deadlock during a STOP SLAVE command. The following was encountered during a test run in the pinloki_select_master test:
Writer thread:
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Thread 14 (Thread 0x7feb73fff700 (LWP 1890)):
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#0 0x00007feb8dda1b3b in do_futex_wait.constprop.1 () from /lib64/libpthread.so.0
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#1 0x00007feb8dda1bcf in __new_sem_wait_slow.constprop.0 () from /lib64/libpthread.so.0
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#2 0x00007feb8dda1c6b in sem_wait@@GLIBC_2.2.5 () from /lib64/libpthread.so.0
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#3 0x00007feb8eef0ab1 in maxbase::Semaphore::wait (this=0x7feb73ffba30, signal_approach=maxbase::Semaphore::IGNORE_SIGNALS) at /home/timofey_turenko_mariadb_com/MaxScale/maxutils/maxbase/include/maxbase/semaphore.hh:144
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#4 0x00007feb8efaf185 in maxbase::Worker::call(std::function<void ()>, maxbase::Worker::execute_mode_t) (this=0x7fffbfb46320, func=..., mode=maxbase::Worker::EXECUTE_AUTO) at /home/timofey_turenko_mariadb_com/MaxScale/maxutils/maxbase/src/worker.cc:535
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#5 0x00007feb80b67fbe in pinloki::Writer::get_connection_details (this=0x176f080) at /home/timofey_turenko_mariadb_com/MaxScale/server/modules/routing/pinloki/writer.cc:77
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#6 0x00007feb80b68235 in pinloki::Writer::has_master_changed (this=0x176f080, conn=...) at /home/timofey_turenko_mariadb_com/MaxScale/server/modules/routing/pinloki/writer.cc:109
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#7 0x00007feb80b688ba in pinloki::Writer::run (this=0x176f080) at /home/timofey_turenko_mariadb_com/MaxScale/server/modules/routing/pinloki/writer.cc:151
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...
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Other thread:
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Thread 9 (Thread 0x7feb82127700 (LWP 1888)):
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#0 0x00007feb8dd9d017 in pthread_join () from /lib64/libpthread.so.0
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#1 0x00007feb8d0890f7 in std::thread::join() () from /lib64/libstdc++.so.6
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#2 0x00007feb80b67e73 in pinloki::Writer::~Writer (this=0x176f080, __in_chrg=<optimized out>) at /home/timofey_turenko_mariadb_com/MaxScale/server/modules/routing/pinloki/writer.cc:70
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#3 0x00007feb80b416f6 in std::default_delete<pinloki::Writer>::operator() (this=0x176f408, __ptr=0x176f080) at /opt/rh/devtoolset-7/root/usr/include/c++/7/bits/unique_ptr.h:78
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#4 0x00007feb80b3f79f in std::unique_ptr<pinloki::Writer, std::default_delete<pinloki::Writer> >::reset (this=0x176f408, __p=0x176f080) at /opt/rh/devtoolset-7/root/usr/include/c++/7/bits/unique_ptr.h:376
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#5 0x00007feb80b37c22 in pinloki::Pinloki::stop_slave (this=0x176f280) at /home/timofey_turenko_mariadb_com/MaxScale/server/modules/routing/pinloki/pinloki.cc:558
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#6 0x00007feb80b4acb4 in pinloki::PinlokiSession::stop_slave (this=0x7feb78014610) at /home/timofey_turenko_mariadb_com/MaxScale/server/modules/routing/pinloki/pinlokisession.cc:392
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...
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