Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964956Ab3CLXRL (ORCPT ); Tue, 12 Mar 2013 19:17:11 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:60155 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933449Ab3CLWcz (ORCPT ); Tue, 12 Mar 2013 18:32:55 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Tigran Mkrtchyan , Weston Andros Adamson , Trond Myklebust Subject: [ 029/100] NFSv4.1: Hold reference to layout hdr in layoutget Date: Tue, 12 Mar 2013 15:31:14 -0700 Message-Id: <20130312223126.165828459@linuxfoundation.org> X-Mailer: git-send-email 1.8.1.rc1.5.g7e0651a In-Reply-To: <20130312223122.884099393@linuxfoundation.org> References: <20130312223122.884099393@linuxfoundation.org> User-Agent: quilt/0.60-2.1.2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4569 Lines: 98 3.8-stable review patch. If anyone has any objections, please let me know. ------------------ From: Weston Andros Adamson commit a47970ff7814718fec31b7d966747c6aa1a3545f upstream. This fixes an oops where a LAYOUTGET is in still in the rpciod queue, but the requesting processes has been killed. Without this, killing the process does the final pnfs_put_layout_hdr() and sets NFS_I(inode)->layout to NULL while the LAYOUTGET rpc task still references it. Example oops: BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 IP: [] pnfs_choose_layoutget_stateid+0x37/0xef [nfsv4] PGD 7365b067 PUD 7365d067 PMD 0 Oops: 0000 [#1] SMP DEBUG_PAGEALLOC Modules linked in: nfs_layout_nfsv41_files nfsv4 auth_rpcgss nfs lockd sunrpc ipt_MASQUERADE ip6table_mangle ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 iptable_nat nf_nat_ipv4 nf_nat iptable_mangle ip6table_filter ip6_tables ppdev e1000 i2c_piix4 i2c_core shpchp parport_pc parport crc32c_intel aesni_intel xts aes_x86_64 lrw gf128mul ablk_helper cryptd mptspi scsi_transport_spi mptscsih mptbase floppy autofs4 CPU 0 Pid: 27, comm: kworker/0:1 Not tainted 3.8.0-dros_cthon2013+ #4 VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform RIP: 0010:[] [] pnfs_choose_layoutget_stateid+0x37/0xef [nfsv4] RSP: 0018:ffff88007b0c1c88 EFLAGS: 00010246 RAX: ffff88006ed36678 RBX: 0000000000000000 RCX: 0000000ea877e3bc RDX: ffff88007a729da8 RSI: 0000000000000000 RDI: ffff88007a72b958 RBP: ffff88007b0c1ca8 R08: 0000000000000002 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88007a72b958 R13: ffff88007a729da8 R14: 0000000000000000 R15: ffffffffa011077e FS: 0000000000000000(0000) GS:ffff88007f600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000080 CR3: 00000000735f8000 CR4: 00000000001407f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process kworker/0:1 (pid: 27, threadinfo ffff88007b0c0000, task ffff88007c2fa0c0) Stack: ffff88006fc05388 ffff88007a72b908 ffff88007b240900 ffff88006fc05388 ffff88007b0c1cd8 ffffffffa01a2170 ffff88007b240900 ffff88007b240900 ffff88007b240970 ffffffffa011077e ffff88007b0c1ce8 ffffffffa0110791 Call Trace: [] nfs4_layoutget_prepare+0x7b/0x92 [nfsv4] [] ? __rpc_atrun+0x15/0x15 [sunrpc] [] rpc_prepare_task+0x13/0x15 [sunrpc] Reported-by: Tigran Mkrtchyan Signed-off-by: Weston Andros Adamson Signed-off-by: Trond Myklebust Signed-off-by: Greg Kroah-Hartman --- fs/nfs/nfs4proc.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -6087,11 +6087,13 @@ static struct page **nfs4_alloc_pages(si static void nfs4_layoutget_release(void *calldata) { struct nfs4_layoutget *lgp = calldata; - struct nfs_server *server = NFS_SERVER(lgp->args.inode); + struct inode *inode = lgp->args.inode; + struct nfs_server *server = NFS_SERVER(inode); size_t max_pages = max_response_pages(server); dprintk("--> %s\n", __func__); nfs4_free_pages(lgp->args.layout.pages, max_pages); + pnfs_put_layout_hdr(NFS_I(inode)->layout); put_nfs_open_context(lgp->args.ctx); kfree(calldata); dprintk("<-- %s\n", __func__); @@ -6106,7 +6108,8 @@ static const struct rpc_call_ops nfs4_la struct pnfs_layout_segment * nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags) { - struct nfs_server *server = NFS_SERVER(lgp->args.inode); + struct inode *inode = lgp->args.inode; + struct nfs_server *server = NFS_SERVER(inode); size_t max_pages = max_response_pages(server); struct rpc_task *task; struct rpc_message msg = { @@ -6136,6 +6139,10 @@ nfs4_proc_layoutget(struct nfs4_layoutge lgp->res.layoutp = &lgp->args.layout; lgp->res.seq_res.sr_slot = NULL; nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0); + + /* nfs4_layoutget_release calls pnfs_put_layout_hdr */ + pnfs_get_layout_hdr(NFS_I(inode)->layout); + task = rpc_run_task(&task_setup_data); if (IS_ERR(task)) return ERR_CAST(task); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/