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Posted to dev@qpid.apache.org by "Jiri Danek (JIRA)" <ji...@apache.org> on 2017/08/02 07:51:00 UTC
[jira] [Closed] (PROTON-1484) [c proactor] SIGSEGV in
pconnection_cleanup
[ https://issues.apache.org/jira/browse/PROTON-1484?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jiri Danek closed PROTON-1484.
------------------------------
> [c proactor] SIGSEGV in pconnection_cleanup
> -------------------------------------------
>
> Key: PROTON-1484
> URL: https://issues.apache.org/jira/browse/PROTON-1484
> Project: Qpid Proton
> Issue Type: Bug
> Components: proton-c
> Affects Versions: proton-c-0.18.0
> Environment: latest git tip for both qpid proton and qpid dispatch on Debian
> Reporter: Jiri Danek
> Attachments: PROTON-1484_1.core.zip, PROTON-1484_2.core.zip
>
>
> I've noticed multiple qdrouterd test failures with seem to come from the same place in proactor code.
> SIGSEGV in qdrouterd tests; in pconnection_cleanup (pc=0x7f...) at /main/qpid-proton/proton-c/src/proactor/epoll.c:645 stop_polling(&pc->timer.epoll_io, pc->psocket.proactor->epollfd);
> Reproducibility: the issue seems nondeterministic
> I am attaching logs and backtraces from two of them below.
> {noformat}
> test 14
> Start 14: system_tests_autolinks
> 14: Test command: /usr/bin/python "/main/qpid-dispatch/build/tests/run.py" "-m" "unittest" "-v" "system_tests_autolinks"
> 14: Test timeout computed to be: 1500
> 14: test_01_autolink_attach (system_tests_autolinks.AutolinkTest) ... FAIL
> 14: test_02_autolink_credit (system_tests_autolinks.AutolinkTest) ... ok
> 14: test_03_autolink_sender (system_tests_autolinks.AutolinkTest) ... ok
> 14: test_04_autolink_receiver (system_tests_autolinks.AutolinkTest) ... ok
> 14: test_05_inter_container_transfer (system_tests_autolinks.AutolinkTest) ... ok
> 14: test_06_manage_autolinks (system_tests_autolinks.AutolinkTest) ... ERROR:root:Connectivity to the peer container was lost
> 14: ERROR:root:Connectivity to the peer container was lost
> 14: ERROR:root:Connectivity to the peer container was lost
> 14: ERROR:root:Connectivity to the peer container was lost
> 14: ERROR:root:Connectivity to the peer container was lost
> 14: ok
> 14: test_07_autolink_attach_with_ext_addr (system_tests_autolinks.AutolinkTest) ... ERROR:root:proton:io: recv: Connection reset by peer
> 14: ERROR:root:proton:io: recv: Connection reset by peer
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: FAIL
> 14: test_08_autolink_sender_with_ext_addr (system_tests_autolinks.AutolinkTest) ... ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: FAIL
> 14: test_09_autolink_receiver_with_ext_addr (system_tests_autolinks.AutolinkTest) ... ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: ERROR:root:proton:io: recv: Connection refused
> 14: FAIL
> 14: ERROR
> 14:
> 14: ======================================================================
> 14: ERROR: tearDownClass (system_tests_autolinks.AutolinkTest)
> 14: ----------------------------------------------------------------------
> 14: Traceback (most recent call last):
> 14: File "/main/qpid-dispatch/tests/system_test.py", line 605, in tearDownClass
> 14: cls.tester.teardown()
> 14: File "/main/qpid-dispatch/tests/system_test.py", line 543, in teardown
> 14: raise RuntimeError("Errors during teardown: \n\n%s" % "\n\n".join([str(e) for e in errors]))
> 14: RuntimeError: Errors during teardown:
> 14:
> 14: Process 81 error: exit code -11, expected -1
> 14: qdrouterd -c test-router.conf -I /main/qpid-dispatch/python
> 14: /main/qpid-dispatch/build/tests/system_test.dir/system_tests_autolinks/AutolinkTest/setUpClass/test-router-1.cmd
> 14: >>>>
> 14: <<<<
> 14:
> 14: ======================================================================
> 14: FAIL: test_01_autolink_attach (system_tests_autolinks.AutolinkTest)
> 14: ----------------------------------------------------------------------
> 14: Traceback (most recent call last):
> 14: File "/main/qpid-dispatch/tests/system_tests_autolinks.py", line 85, in test_01_autolink_attach
> 14: self.assertEqual(None, test.error)
> 14: AssertionError: None != 'Timeout Expired: n_rx_attach=1 n_tx_attach=1'
> 14:
> 14: ======================================================================
> 14: FAIL: test_07_autolink_attach_with_ext_addr (system_tests_autolinks.AutolinkTest)
> 14: ----------------------------------------------------------------------
> 14: Traceback (most recent call last):
> 14: File "/main/qpid-dispatch/tests/system_tests_autolinks.py", line 146, in test_07_autolink_attach_with_ext_addr
> 14: self.assertEqual(None, test.error)
> 14: AssertionError: None != 'Timeout Expired: n_rx_attach=0 n_tx_attach=0'
> 14:
> 14: ======================================================================
> 14: FAIL: test_08_autolink_sender_with_ext_addr (system_tests_autolinks.AutolinkTest)
> 14: ----------------------------------------------------------------------
> 14: Traceback (most recent call last):
> 14: File "/main/qpid-dispatch/tests/system_tests_autolinks.py", line 156, in test_08_autolink_sender_with_ext_addr
> 14: self.assertEqual(None, test.error)
> 14: AssertionError: None != 'Timeout Expired: last_action=Connected route container n_sent=0 n_received=0 n_settled=0'
> 14:
> 14: ======================================================================
> 14: FAIL: test_09_autolink_receiver_with_ext_addr (system_tests_autolinks.AutolinkTest)
> 14: ----------------------------------------------------------------------
> 14: Traceback (most recent call last):
> 14: File "/main/qpid-dispatch/tests/system_tests_autolinks.py", line 166, in test_09_autolink_receiver_with_ext_addr
> 14: self.assertEqual(None, test.error)
> 14: AssertionError: None != 'Timeout Expired: last_action=Connected route container n_sent=0 n_received=0 n_settled=0'
> 14:
> 14: ----------------------------------------------------------------------
> 14: Ran 9 tests in 248.688s
> 14:
> 14: FAILED (failures=4, errors=1)
> 14/33 Test #14: system_tests_autolinks ....................***Failed 248.75 sec
> {noformat}
> {noformat}
> root@9622b08a07af:/main/qpid-dispatch/build# gdb -c /main/qpid-dispatch/build/tests/system_test.dir/system_tests_autolinks/AutolinkTest/setUpClass/core `which qdrouterd`
> GNU gdb (Debian 7.12-6) 7.12.0.20161007-git
> Copyright (C) 2016 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law. Type "show copying"
> and "show warranty" for details.
> This GDB was configured as "x86_64-linux-gnu".
> Type "show configuration" for configuration details.
> For bug reporting instructions, please see:
> <http://www.gnu.org/software/gdb/bugs/>.
> Find the GDB manual and other documentation resources online at:
> <http://www.gnu.org/software/gdb/documentation/>.
> For help, type "help".
> Type "apropos word" to search for commands related to "word"...
> Reading symbols from /usr/sbin/qdrouterd...(no debugging symbols found)...done.
> [New LWP 81]
> [New LWP 84]
> [New LWP 82]
> [New LWP 83]
> [New LWP 85]
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
> Core was generated by `qdrouterd -c test-router.conf -I /main/qpid-dispatch/python'.
> Program terminated with signal SIGSEGV, Segmentation fault.
> #0 0x00007f89a496f320 in pconnection_cleanup (pc=0x55e69fe2dec0) at /main/qpid-proton/proton-c/src/proactor/epoll.c:645
> 645 stop_polling(&pc->timer.epoll_io, pc->psocket.proactor->epollfd);
> [Current thread is 1 (Thread 0x7f89a5245080 (LWP 81))]
> (gdb) thread apply all bt
> Thread 5 (Thread 0x7f899b7fe700 (LWP 85)):
> #0 0x00007f89a3afaf33 in epoll_wait () at ../sysdeps/unix/syscall-template.S:84
> #1 0x00007f89a4971fcd in proactor_do_epoll (p=0x55e69fd5f1a0, can_block=true) at /main/qpid-proton/proton-c/src/proactor/epoll.c:1634
> #2 0x00007f89a4972185 in pn_proactor_wait (p=0x55e69fd5f1a0) at /main/qpid-proton/proton-c/src/proactor/epoll.c:1680
> #3 0x00007f89a4e13e7a in thread_run (arg=0x55e69fb27ec0) at /main/qpid-dispatch/src/server.c:817
> #4 0x00007f89a4755494 in start_thread (arg=0x7f899b7fe700) at pthread_create.c:333
> #5 0x00007f89a3afa93f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
> Thread 4 (Thread 0x7f89a0a94700 (LWP 83)):
> #0 0x00007f89a3afaf33 in epoll_wait () at ../sysdeps/unix/syscall-template.S:84
> #1 0x00007f89a4971fcd in proactor_do_epoll (p=0x55e69fd5f1a0, can_block=true) at /main/qpid-proton/proton-c/src/proactor/epoll.c:1634
> #2 0x00007f89a4972185 in pn_proactor_wait (p=0x55e69fd5f1a0) at /main/qpid-proton/proton-c/src/proactor/epoll.c:1680
> #3 0x00007f89a4e13e7a in thread_run (arg=0x55e69fb27ec0) at /main/qpid-dispatch/src/server.c:817
> #4 0x00007f89a4755494 in start_thread (arg=0x7f89a0a94700) at pthread_create.c:333
> #5 0x00007f89a3afa93f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
> Thread 3 (Thread 0x7f89a1295700 (LWP 82)):
> #0 pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
> #1 0x00007f89a4df19c0 in sys_cond_wait (cond=0x55e69fdcee80, held_mutex=0x55e69fdcef40) at /main/qpid-dispatch/src/posix/threading.c:91
> #2 0x00007f89a4e070fa in router_core_thread (arg=0x55e69fdceb70) at /main/qpid-dispatch/src/router_core/router_core_thread.c:53
> #3 0x00007f89a4755494 in start_thread (arg=0x7f89a1295700) at pthread_create.c:333
> #4 0x00007f89a3afa93f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
> Thread 2 (Thread 0x7f899bfff700 (LWP 84)):
> #0 0x00007f89a3afaf33 in epoll_wait () at ../sysdeps/unix/syscall-template.S:84
> #1 0x00007f89a4971fcd in proactor_do_epoll (p=0x55e69fd5f1a0, can_block=true) at /main/qpid-proton/proton-c/src/proactor/epoll.c:1634
> #2 0x00007f89a4972185 in pn_proactor_wait (p=0x55e69fd5f1a0) at /main/qpid-proton/proton-c/src/proactor/epoll.c:1680
> #3 0x00007f89a4e13e7a in thread_run (arg=0x55e69fb27ec0) at /main/qpid-dispatch/src/server.c:817
> #4 0x00007f89a4755494 in start_thread (arg=0x7f899bfff700) at pthread_create.c:333
> ---Type <return> to continue, or q <return> to quit---
> #5 0x00007f89a3afa93f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
> Thread 1 (Thread 0x7f89a5245080 (LWP 81)):
> #0 0x00007f89a496f320 in pconnection_cleanup (pc=0x55e69fe2dec0) at /main/qpid-proton/proton-c/src/proactor/epoll.c:645
> #1 0x00007f89a496fac5 in pconnection_process (pc=0x55e69fe2dec0, events=0, timeout=false, topup=false) at /main/qpid-proton/proton-c/src/proactor/epoll.c:843
> #2 0x00007f89a49720e5 in proactor_do_epoll (p=0x55e69fd5f1a0, can_block=true) at /main/qpid-proton/proton-c/src/proactor/epoll.c:1662
> #3 0x00007f89a4972185 in pn_proactor_wait (p=0x55e69fd5f1a0) at /main/qpid-proton/proton-c/src/proactor/epoll.c:1680
> #4 0x00007f89a4e13e7a in thread_run (arg=0x55e69fb27ec0) at /main/qpid-dispatch/src/server.c:817
> #5 0x00007f89a4e14987 in qd_server_run (qd=0x55e69facc010) at /main/qpid-dispatch/src/server.c:1031
> #6 0x000055e69f5a28d0 in ?? ()
> #7 0x000055e69f5a325b in main ()
> (gdb)
> {noformat}
> ========================================
> {noformat}
> 16: Test command: /usr/bin/python "/main/qpid-dispatch/build/tests/run.py" "-m" "unittest" "-v" "system_tests_management"
> 16: Test timeout computed to be: 1500
> 16: test_bad_query (system_tests_management.ManagementTest)
> 16: Test that various badly formed queries get the proper response ... ok
> 16: test_connection (system_tests_management.ManagementTest)
> 16: Verify there is at least one connection ... ok
> 16: test_create_fixed_address (system_tests_management.ManagementTest) ... ok
> 16: test_create_listener (system_tests_management.ManagementTest)
> 16: Create a new listener on a running router ... ok
> 16: test_dummy (system_tests_management.ManagementTest)
> 16: Test all operations on the dummy test entity ... ok
> 16: test_entity_names (system_tests_management.ManagementTest) ... ok
> 16: test_get_attributes (system_tests_management.ManagementTest) ... ok
> 16: test_get_operations (system_tests_management.ManagementTest) ... ok
> 16: test_get_schema (system_tests_management.ManagementTest) ... ok
> 16: test_get_types (system_tests_management.ManagementTest) ... ok
> 16: test_link (system_tests_management.ManagementTest)
> 16: Verify we can find our own reply-to address in links ... ok
> 16: test_log (system_tests_management.ManagementTest)
> 16: Create, update and query log entities ... ok
> 16: test_query_attributes (system_tests_management.ManagementTest)
> 16: Query with attributes only ... ok
> 16: test_query_type (system_tests_management.ManagementTest)
> 16: Query with type only ... ok
> 16: test_query_type_attributes (system_tests_management.ManagementTest)
> 16: Query with type and attribute names ... ok
> 16: test_remote_node (system_tests_management.ManagementTest)
> 16: Test that we can access management info of remote nodes using get_mgmt_nodes addresses ... ok
> 16: test_router (system_tests_management.ManagementTest)
> 16: Verify router counts match entity counts ... ok
> 16: test_router_node (system_tests_management.ManagementTest)
> 16: Test node entity in a trio of linked routers ... ERROR
> 16: test_standalone_no_inter_router (system_tests_management.ManagementTest)
> 16: Verify that we do not allow inter-router connectors or listeners in standalone mode ... ERROR
> 16: ERROR
> 16:
> 16: ======================================================================
> 16: ERROR: test_router_node (system_tests_management.ManagementTest)
> 16: Test node entity in a trio of linked routers
> 16: ----------------------------------------------------------------------
> 16: Traceback (most recent call last):
> 16: File "/main/qpid-dispatch/tests/system_tests_management.py", line 112, in setUp
> 16: self.node = self.cleanup(Node.connect(self.router.addresses[0]))
> 16: File "/main/qpid-dispatch/python/qpid_dispatch/management/client.py", line 100, in connect
> 16: return Node(Node.connection(url, router, timeout, ssl_domain, sasl))
> 16: File "/main/qpid-dispatch/python/qpid_dispatch/management/client.py", line 95, in connection
> 16: password=str(sasl.password) if sasl else None)
> 16: File "/usr/lib/python2.7/dist-packages/proton/utils.py", line 213, in __init__
> 16: msg="Opening connection")
> 16: File "/usr/lib/python2.7/dist-packages/proton/utils.py", line 279, in wait
> 16: "Connection %s disconnected: %s" % (self.url, self.disconnected))
> 16: ConnectionException: Connection amqp://0.0.0.0:29636/$management disconnected: Condition('proton:io', 'recv: Connection reset by peer')
> 16:
> 16: ======================================================================
> 16: ERROR: test_standalone_no_inter_router (system_tests_management.ManagementTest)
> 16: Verify that we do not allow inter-router connectors or listeners in standalone mode
> 16: ----------------------------------------------------------------------
> 16: Traceback (most recent call last):
> 16: File "/main/qpid-dispatch/tests/system_tests_management.py", line 112, in setUp
> 16: self.node = self.cleanup(Node.connect(self.router.addresses[0]))
> 16: File "/main/qpid-dispatch/python/qpid_dispatch/management/client.py", line 100, in connect
> 16: return Node(Node.connection(url, router, timeout, ssl_domain, sasl))
> 16: File "/main/qpid-dispatch/python/qpid_dispatch/management/client.py", line 95, in connection
> 16: password=str(sasl.password) if sasl else None)
> 16: File "/usr/lib/python2.7/dist-packages/proton/utils.py", line 213, in __init__
> 16: msg="Opening connection")
> 16: File "/usr/lib/python2.7/dist-packages/proton/utils.py", line 279, in wait
> 16: "Connection %s disconnected: %s" % (self.url, self.disconnected))
> 16: ConnectionException: Connection amqp://0.0.0.0:29636/$management disconnected: Condition('proton:io', 'recv: Connection refused')
> 16:
> 16: ======================================================================
> 16: ERROR: tearDownClass (system_tests_management.ManagementTest)
> 16: ----------------------------------------------------------------------
> 16: Traceback (most recent call last):
> 16: File "/main/qpid-dispatch/tests/system_test.py", line 605, in tearDownClass
> 16: cls.tester.teardown()
> 16: File "/main/qpid-dispatch/tests/system_test.py", line 543, in teardown
> 16: raise RuntimeError("Errors during teardown: \n\n%s" % "\n\n".join([str(e) for e in errors]))
> 16: RuntimeError: Errors during teardown:
> 16:
> 16: Process 95 error: exit code -11, expected -1
> 16: qdrouterd -c solo.conf -I /main/qpid-dispatch/python
> 16: /main/qpid-dispatch/build/tests/system_test.dir/system_tests_management/ManagementTest/setUpClass/solo-1.cmd
> 16: >>>>
> 16: <<<<
> 16:
> 16: ----------------------------------------------------------------------
> 16: Ran 19 tests in 8.165s
> 16:
> 16: FAILED (errors=3)
> 16/33 Test #16: system_tests_management ...................***Failed 8.24 sec
> {noformat}
> {noformat}
> root@9622b08a07af:/main/qpid-dispatch/build# gdb -c /main/qpid-dispatch/build/tests/system_test.dir/system_tests_management/ManagementTest/setUpClass/core `which qdrouterd`
> GNU gdb (Debian 7.12-6) 7.12.0.20161007-git
> Copyright (C) 2016 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law. Type "show copying"
> and "show warranty" for details.
> This GDB was configured as "x86_64-linux-gnu".
> Type "show configuration" for configuration details.
> For bug reporting instructions, please see:
> <http://www.gnu.org/software/gdb/bugs/>.
> Find the GDB manual and other documentation resources online at:
> <http://www.gnu.org/software/gdb/documentation/>.
> For help, type "help".
> Type "apropos word" to search for commands related to "word"...
> Reading symbols from /usr/sbin/qdrouterd...(no debugging symbols found)...done.
> [New LWP 104]
> [New LWP 100]
> [New LWP 105]
> [New LWP 95]
> [New LWP 106]
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
> Core was generated by `qdrouterd -c solo.conf -I /main/qpid-dispatch/python'.
> Program terminated with signal SIGSEGV, Segmentation fault.
> #0 0x00007ff2b9320320 in pconnection_cleanup (pc=0x7ff2a80af460) at /main/qpid-proton/proton-c/src/proactor/epoll.c:645
> 645 stop_polling(&pc->timer.epoll_io, pc->psocket.proactor->epollfd);
> [Current thread is 1 (Thread 0x7ff2b5445700 (LWP 104))]
> (gdb) thread apply all bt
> Thread 5 (Thread 0x7ff2affff700 (LWP 106)):
> #0 0x00007ff2b84abf33 in epoll_wait () at ../sysdeps/unix/syscall-template.S:84
> #1 0x00007ff2b9322fcd in proactor_do_epoll (p=0x55bda0cc1f00, can_block=true) at /main/qpid-proton/proton-c/src/proactor/epoll.c:1634
> #2 0x00007ff2b9323185 in pn_proactor_wait (p=0x55bda0cc1f00) at /main/qpid-proton/proton-c/src/proactor/epoll.c:1680
> #3 0x00007ff2b97c4e7a in thread_run (arg=0x55bda0cc1e00) at /main/qpid-dispatch/src/server.c:817
> #4 0x00007ff2b9106494 in start_thread (arg=0x7ff2affff700) at pthread_create.c:333
> #5 0x00007ff2b84ab93f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
> Thread 4 (Thread 0x7ff2b9bf6080 (LWP 95)):
> #0 0x00007ff2b84abf33 in epoll_wait () at ../sysdeps/unix/syscall-template.S:84
> #1 0x00007ff2b9322fcd in proactor_do_epoll (p=0x55bda0cc1f00, can_block=true) at /main/qpid-proton/proton-c/src/proactor/epoll.c:1634
> #2 0x00007ff2b9323185 in pn_proactor_wait (p=0x55bda0cc1f00) at /main/qpid-proton/proton-c/src/proactor/epoll.c:1680
> #3 0x00007ff2b97c4e7a in thread_run (arg=0x55bda0cc1e00) at /main/qpid-dispatch/src/server.c:817
> #4 0x00007ff2b97c5987 in qd_server_run (qd=0x55bda0a36010) at /main/qpid-dispatch/src/server.c:1031
> #5 0x000055bda002f8d0 in ?? ()
> #6 0x000055bda003025b in main ()
> Thread 3 (Thread 0x7ff2b4c44700 (LWP 105)):
> #0 0x00007ff2b84abf33 in epoll_wait () at ../sysdeps/unix/syscall-template.S:84
> #1 0x00007ff2b9322fcd in proactor_do_epoll (p=0x55bda0cc1f00, can_block=true) at /main/qpid-proton/proton-c/src/proactor/epoll.c:1634
> #2 0x00007ff2b9323185 in pn_proactor_wait (p=0x55bda0cc1f00) at /main/qpid-proton/proton-c/src/proactor/epoll.c:1680
> #3 0x00007ff2b97c4e7a in thread_run (arg=0x55bda0cc1e00) at /main/qpid-dispatch/src/server.c:817
> #4 0x00007ff2b9106494 in start_thread (arg=0x7ff2b4c44700) at pthread_create.c:333
> #5 0x00007ff2b84ab93f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
> Thread 2 (Thread 0x7ff2b5c46700 (LWP 100)):
> #0 pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
> #1 0x00007ff2b97a29c0 in sys_cond_wait (cond=0x55bda0d38e00, held_mutex=0x55bda0d38ec0) at /main/qpid-dispatch/src/posix/threading.c:91
> #2 0x00007ff2b97b80fa in router_core_thread (arg=0x55bda0d38b10) at /main/qpid-dispatch/src/router_core/router_core_thread.c:53
> ---Type <return> to continue, or q <return> to quit---
> #3 0x00007ff2b9106494 in start_thread (arg=0x7ff2b5c46700) at pthread_create.c:333
> #4 0x00007ff2b84ab93f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
> Thread 1 (Thread 0x7ff2b5445700 (LWP 104)):
> #0 0x00007ff2b9320320 in pconnection_cleanup (pc=0x7ff2a80af460) at /main/qpid-proton/proton-c/src/proactor/epoll.c:645
> #1 0x00007ff2b9320ac5 in pconnection_process (pc=0x7ff2a80af460, events=0, timeout=false, topup=false) at /main/qpid-proton/proton-c/src/proactor/epoll.c:843
> #2 0x00007ff2b93230e5 in proactor_do_epoll (p=0x55bda0cc1f00, can_block=true) at /main/qpid-proton/proton-c/src/proactor/epoll.c:1662
> #3 0x00007ff2b9323185 in pn_proactor_wait (p=0x55bda0cc1f00) at /main/qpid-proton/proton-c/src/proactor/epoll.c:1680
> #4 0x00007ff2b97c4e7a in thread_run (arg=0x55bda0cc1e00) at /main/qpid-dispatch/src/server.c:817
> #5 0x00007ff2b9106494 in start_thread (arg=0x7ff2b5445700) at pthread_create.c:333
> #6 0x00007ff2b84ab93f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
> (gdb)
> {noformat}
> {noformat}
> (gdb) info locals
> can_free = false
> {noformat}
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