Return-Path: Received: from mail-pl0-f67.google.com ([209.85.160.67]:39957 "EHLO mail-pl0-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725896AbeHMG0x (ORCPT ); Mon, 13 Aug 2018 02:26:53 -0400 To: trond.myklebust@hammerspace.com, anna.schumaker@netapp.com Cc: linux-nfs@vger.kernel.org, Linux Kernel Mailing List From: Jia-Ju Bai Subject: [BUG] fs: nfs: pnfs_nfs: a possible sleep-in-atomic-context bug in pnfs_generic_recover_commit_reqs() Message-ID: <6e0b1c99-bfe5-29a9-51b1-1c71fe0b91b4@gmail.com> Date: Mon, 13 Aug 2018 11:46:28 +0800 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Sender: linux-nfs-owner@vger.kernel.org List-ID: The kernel may sleep with holding a spinlock. The function call paths (from bottom to top) in Linux-4.16 are: [FUNC] mutex_lock_nested fs/nfs/write.c, 1045: mutex_lock_nested in nfs_scan_commit_list fs/nfs/pnfs_nfs.c, 145: nfs_scan_commit_list in pnfs_generic_recover_commit_reqs fs/nfs/pnfs_nfs.c, 154: spin_lock in pnfs_generic_recover_commit_reqs I do not find a good way to fix, so I only report. This is found by my static analysis tool (DSAC). Thanks, Jia-Ju Bai