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It appears that you can't change what you are polling for while connecting.

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WARNING: ThreadSanitizer: data race
    Read of size 8 at 0x000000000001 by thread T1 (mutexes: write M1):
    #0 epoll_ctl <null>
    #1 watch_fd lib/isc/unix/socket.c:704:8
    #2 wakeup_socket lib/isc/unix/socket.c:897:11
    #3 process_ctlfd lib/isc/unix/socket.c:3362:3
    #4 process_fds lib/isc/unix/socket.c:3275:10
    #5 netthread lib/isc/unix/socket.c:3516:10

    Previous write of size 8 at 0x000000000001 by thread T2 (mutexes: write M2):
    #0 connect <null>
    #1 isc_socket_connect lib/isc/unix/socket.c:4737:7
    #2 resquery_send lib/dns/resolver.c:2892:13
    #3 fctx_query lib/dns/resolver.c:2202:12
    #4 fctx_try lib/dns/resolver.c:4300:11
    #5 resquery_connected lib/dns/resolver.c:3130:4
    #6 dispatch lib/isc/task.c:1152:7
    #7 run lib/isc/task.c:1344:2

    Location is file descriptor 513 created by thread T2 at:
    #0 connect <null>
    #1 isc_socket_connect lib/isc/unix/socket.c:4737:7
    #2 resquery_send lib/dns/resolver.c:2892:13
    #3 fctx_query lib/dns/resolver.c:2202:12
    #4 fctx_try lib/dns/resolver.c:4300:11
    #5 resquery_connected lib/dns/resolver.c:3130:4
    #6 dispatch lib/isc/task.c:1152:7
    #7 run lib/isc/task.c:1344:2

    Mutex M1 (0x000000000016) created at:
    #0 pthread_mutex_init <null>
    #1 isc__mutex_init lib/isc/pthreads/mutex.c:288:8
    #2 setup_thread lib/isc/unix/socket.c:3584:3
    #3 isc_socketmgr_create2 lib/isc/unix/socket.c:3825:3
    #4 create_managers bin/named/main.c:932:11
    #5 setup bin/named/main.c:1223:11
    #6 main bin/named/main.c:1523:2

    Mutex M2 is already destroyed.

    Thread T1 'isc-socket-1' (running) created by main thread at:
    #0 pthread_create <null>
    #1 isc_thread_create lib/isc/pthreads/thread.c:73:8
    #2 isc_socketmgr_create2 lib/isc/unix/socket.c:3826:3
    #3 create_managers bin/named/main.c:932:11
    #4 setup bin/named/main.c:1223:11
    #5 main bin/named/main.c:1523:2

    Thread T2 (running) created by main thread at:
    #0 pthread_create <null>
    #1 isc_thread_create lib/isc/pthreads/thread.c:73:8
    #2 isc_taskmgr_create lib/isc/task.c:1434:3
    #3 create_managers bin/named/main.c:915:11
    #4 setup bin/named/main.c:1223:11
    #5 main bin/named/main.c:1523:2

    SUMMARY: ThreadSanitizer: data race in epoll_ctl
This commit is contained in:
Mark Andrews
2020-09-23 13:54:06 +10:00
parent 62053255ec
commit c37b251eb9
1 changed files with 6 additions and 0 deletions
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6
lib/isc/unix/socket.c
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@@ -701,7 +701,13 @@ watch_fd(isc__socketthread_t *thread, int fd, int msg) {
event.data.fd = fd;
op = (oldevents == 0U) ? EPOLL_CTL_ADD : EPOLL_CTL_MOD;
if (thread->fds[fd] != NULL) {
LOCK(&thread->fds[fd]->lock);
}
ret = epoll_ctl(thread->epoll_fd, op, fd, &event);
if (thread->fds[fd] != NULL) {
UNLOCK(&thread->fds[fd]->lock);
}
if (ret == -1) {
if (errno == EEXIST) {
UNEXPECTED_ERROR(__FILE__, __LINE__,