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authorNeilBrown <neilb@suse.de>2020-04-03 14:33:41 +1100
committerTrond Myklebust <trond.myklebust@hammerspace.com>2020-04-28 15:58:38 -0400
commit7c4310ff56422ea43418305d22bbc5fe19150ec4 (patch)
tree2cadb77a946a666fc0441c2e3dd43572d0664735 /include
parent6e47666ef93dc9c4011407df8d2de1dd1ed39f25 (diff)
downloadlinux-7c4310ff56422ea43418305d22bbc5fe19150ec4.tar.bz2
SUNRPC: defer slow parts of rpc_free_client() to a workqueue.
The rpciod workqueue is on the write-out path for freeing dirty memory, so it is important that it never block waiting for memory to be allocated - this can lead to a deadlock. rpc_execute() - which is often called by an rpciod work item - calls rcp_task_release_client() which can lead to rpc_free_client(). rpc_free_client() makes two calls which could potentially block wating for memory allocation. rpc_clnt_debugfs_unregister() calls into debugfs and will block while any of the debugfs files are being accessed. In particular it can block while any of the 'open' methods are being called and all of these use malloc for one thing or another. So this can deadlock if the memory allocation waits for NFS to complete some writes via rpciod. rpc_clnt_remove_pipedir() can take the inode_lock() and while it isn't obvious that memory allocations can happen while the lock it held, it is safer to assume they might and to not let rpciod call rpc_clnt_remove_pipedir(). So this patch moves these two calls (together with the final kfree() and rpciod_down()) into a work-item to be run from the system work-queue. rpciod can continue its important work, and the final stages of the free can happen whenever they happen. I have seen this deadlock on a 4.12 based kernel where debugfs used synchronize_srcu() when removing objects. synchronize_srcu() requires a workqueue and there were no free workther threads and none could be allocated. While debugsfs no longer uses SRCU, I believe the deadlock is still possible. Signed-off-by: NeilBrown <neilb@suse.de> Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/sunrpc/clnt.h8
1 files changed, 7 insertions, 1 deletions
diff --git a/include/linux/sunrpc/clnt.h b/include/linux/sunrpc/clnt.h
index ca7e108248e2..7bd124e06b36 100644
--- a/include/linux/sunrpc/clnt.h
+++ b/include/linux/sunrpc/clnt.h
@@ -71,7 +71,13 @@ struct rpc_clnt {
#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
struct dentry *cl_debugfs; /* debugfs directory */
#endif
- struct rpc_xprt_iter cl_xpi;
+ /* cl_work is only needed after cl_xpi is no longer used,
+ * and that are of similar size
+ */
+ union {
+ struct rpc_xprt_iter cl_xpi;
+ struct work_struct cl_work;
+ };
const struct cred *cl_cred;
};