4.14-stable review patch. If anyone has any objections, please let me know.
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From: Trond Myklebust trondmy@gmail.com
[ Upstream commit 22876f540bdf19af9e4fca893ce02ba7ee65ebcc ]
The NFS read code can trigger writeback while holding the page lock. If an error then triggers a call to nfs_write_error_remove_page(), we can deadlock.
Signed-off-by: Trond Myklebust trond.myklebust@hammerspace.com Signed-off-by: Anna Schumaker Anna.Schumaker@Netapp.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/nfs/write.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/fs/nfs/write.c b/fs/nfs/write.c index 010733c8bdcd3..1b5791d5537a3 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -587,9 +587,8 @@ nfs_lock_and_join_requests(struct page *page)
static void nfs_write_error_remove_page(struct nfs_page *req) { + SetPageError(req->wb_page); nfs_end_page_writeback(req); - generic_error_remove_page(page_file_mapping(req->wb_page), - req->wb_page); nfs_release_request(req); }