From: Chen Hanxiao <chenhanxiao(a)gmail.com&gt; This patch fix a dead lock when try to read a rbd image When trying to connect a rbd server (ceph-0.94.7-1.el7.centos.x86_64), rbd_list/rbd_open enter a dead lock state. Backtrace: Thread 30 (Thread 0x7fdb342d0700 (LWP 12105)): #0 0x00007fdb40b16705 in pthread_cond_wait@(a)GLIBC_2.3.2 () from /lib64/libpthread.so.0 #1 0x00007fdb294273f1 in librados::IoCtxImpl::operate_read(object_t const&, ObjectOperation*, ceph::buffer::list*, int) () from /lib64/librados.so.2 #2 0x00007fdb29429fcc in librados::IoCtxImpl::read(object_t const&, ceph::buffer::list&, unsigned long, unsigned long) () from /lib64/librados.so.2 #3 0x00007fdb293e850c in librados::IoCtx::read(std::string const&, ceph::buffer::list&, unsigned long, unsigned long) () from /lib64/librados.so.2 #4 0x00007fdb2b9dd15e in librbd::list(librados::IoCtx&, std::vector<std::string, std::allocator<std::string> >&) () from /lib64/librbd.so.1 #5 0x00007fdb2b98c089 in rbd_list () from /lib64/librbd.so.1 #6 0x00007fdb2e1a8052 in virStorageBackendRBDRefreshPool (conn=<optimized out>, pool=0x7fdafc002d50) at storage/storage_backend_rbd.c:366 #7 0x00007fdb2e193833 in storagePoolCreate (obj=0x7fdb1c1fd5a0, flags=<optimized out>) at storage/storage_driver.c:876 #8 0x00007fdb43790ea1 in virStoragePoolCreate (pool=pool@entry=0x7fdb1c1fd5a0, flags=0) at libvirt-storage.c:695 #9 0x00007fdb443becdf in remoteDispatchStoragePoolCreate (server=0x7fdb45fb2ab0, msg=0x7fdb45fb3db0, args=0x7fdb1c0037d0, rerr=0x7fdb342cfc30, client=<optimized out>) at remote_dispatch.h:14383 #10 remoteDispatchStoragePoolCreateHelper (server=0x7fdb45fb2ab0, client=<optimized out>, msg=0x7fdb45fb3db0, rerr=0x7fdb342cfc30, args=0x7fdb1c0037d0, ret=0x7fdb1c1b3260) at remote_dispatch.h:14359 #11 0x00007fdb437d9c42 in virNetServerProgramDispatchCall (msg=0x7fdb45fb3db0, client=0x7fdb45fd1a80, server=0x7fdb45fb2ab0, prog=0x7fdb45fcd670) at rpc/virnetserverprogram.c:437 #12 virNetServerProgramDispatch (prog=0x7fdb45fcd670, server=server@entry=0x7fdb45fb2ab0, client=0x7fdb45fd1a80, msg=0x7fdb45fb3db0) at rpc/virnetserverprogram.c:307 #13 0x00007fdb437d4ebd in virNetServerProcessMsg (msg=<optimized out>, prog=<optimized out>, client=<optimized out>, srv=0x7fdb45fb2ab0) at rpc/virnetserver.c:135 #14 virNetServerHandleJob (jobOpaque=<optimized out>, opaque=0x7fdb45fb2ab0) at rpc/virnetserver.c:156 #15 0x00007fdb436cfb35 in virThreadPoolWorker (opaque=opaque@entry=0x7fdb45fa7650) at util/virthreadpool.c:145 #16 0x00007fdb436cf058 in virThreadHelper (data=<optimized out>) at util/virthread.c:206 #17 0x00007fdb40b12df5 in start_thread () from /lib64/libpthread.so.0 #18 0x00007fdb408401ad in clone () from /lib64/libc.so.6 366 len = rbd_list(ptr.ioctx, names, &max_size); (gdb) n [New Thread 0x7fdb20758700 (LWP 22458)] [New Thread 0x7fdb20556700 (LWP 22459)] [Thread 0x7fdb20758700 (LWP 22458) exited] [New Thread 0x7fdb20455700 (LWP 22460)] [Thread 0x7fdb20556700 (LWP 22459) exited] [New Thread 0x7fdb20556700 (LWP 22461)] infinite loop... Signed-off-by: Chen Hanxiao <chenhanxiao(a)gmail.com&gt; --- src/storage/storage_backend_rbd.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/src/storage/storage_backend_rbd.c b/src/storage/storage_backend_rbd.c index b1c51ab..233737b 100644 --- a/src/storage/storage_backend_rbd.c +++ b/src/storage/storage_backend_rbd.c @@ -95,6 +95,9 @@ virStorageBackendRBDOpenRADOSConn(virStorageBackendRBDStatePtr ptr, goto cleanup; } + /* try default location, but ignore failure */ + rados_conf_read_file(ptr->cluster, NULL); + if (!conn) { virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("'ceph' authentication not supported " @@ -124,6 +127,10 @@ virStorageBackendRBDOpenRADOSConn(virStorageBackendRBDStatePtr ptr, _("failed to create the RADOS cluster")); goto cleanup; } + + /* try default location, but ignore failure */ + rados_conf_read_file(ptr->cluster, NULL); + if (virStorageBackendRBDRADOSConfSet(ptr->cluster, "auth_supported", "none") < 0) goto cleanup; -- 2.7.4