From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from pat.uio.no (pat.uio.no [129.240.10.15]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTP id 5AC98DDDEB for ; Sun, 18 Nov 2007 06:17:14 +1100 (EST) Subject: Re: [BUG] 2.6.24-rc2-mm1 - kernel bug on nfs v4 From: Trond Myklebust To: Torsten Kaiser In-Reply-To: <64bb37e0711170953p67d1be49lf4eaa190d662e2b4@mail.gmail.com> References: <473DA608.1020804@linux.vnet.ibm.com> <64bb37e0711170953p67d1be49lf4eaa190d662e2b4@mail.gmail.com> Content-Type: multipart/mixed; boundary="=-JB8J0Rnqj+uhc3kuo5ga" Date: Sat, 17 Nov 2007 13:58:40 -0500 Message-Id: <1195325920.7484.1.camel@localhost.localdomain> Mime-Version: 1.0 Cc: LKML , Kamalesh Babulal , linuxppc-dev@ozlabs.org, nfs@lists.sourceforge.net, Andrew Morton , Jan Blunck , Balbir Singh List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , --=-JB8J0Rnqj+uhc3kuo5ga Content-Type: text/plain Content-Transfer-Encoding: 7bit On Sat, 2007-11-17 at 18:53 +0100, Torsten Kaiser wrote: > On Nov 16, 2007 3:15 PM, Kamalesh Babulal wrote: > > Hi Andrew, > > > > The kernel enters the xmon state while running the file system > > stress on nfs v4 mounted partition. > [snip] > > 0:mon> t > > [c0000000dbd4fb50] c000000000069768 .__wake_up+0x54/0x88 > > [c0000000dbd4fc00] d00000000086b890 .nfs_sb_deactive+0x44/0x58 [nfs] > > [c0000000dbd4fc80] d000000000872658 .nfs_free_unlinkdata+0x2c/0x74 [nfs] > > [c0000000dbd4fd10] d000000000598510 .rpc_release_calldata+0x50/0x74 [sunrpc] > > [c0000000dbd4fda0] c00000000008d960 .run_workqueue+0x10c/0x1f4 > > [c0000000dbd4fe50] c00000000008ec70 .worker_thread+0x118/0x138 > > [c0000000dbd4ff00] c0000000000939f4 .kthread+0x78/0xc4 > > [c0000000dbd4ff90] c00000000002b060 .kernel_thread+0x4c/0x68 Could you try with the attached patch. Cheers Trond --=-JB8J0Rnqj+uhc3kuo5ga Content-Disposition: inline; filename=linux-2.6.24-007-fix_nfs_free_unlinkdata.dif Content-Type: message/rfc822; name=linux-2.6.24-007-fix_nfs_free_unlinkdata.dif From: Trond Myklebust Date: Sat, 17 Nov 2007 13:52:36 -0500 Subject: NFS: Fix nfs_free_unlinkdata() Message-Id: <1195325920.7484.2.camel@localhost.localdomain> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit We should really only be calling nfs_sb_deactive() at the end of an RPC call, to balance the nfs_sb_active() call in nfs_do_call_unlink(). OTOH, nfs_free_unlinkdata() can be called from a variety of other situations. Fix is to move the call to nfs_sb_deactive() into nfs_async_unlink_release(). Signed-off-by: Trond Myklebust --- fs/nfs/unlink.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/fs/nfs/unlink.c b/fs/nfs/unlink.c index b97d3bb..c90862a 100644 --- a/fs/nfs/unlink.c +++ b/fs/nfs/unlink.c @@ -31,7 +31,6 @@ struct nfs_unlinkdata { static void nfs_free_unlinkdata(struct nfs_unlinkdata *data) { - nfs_sb_deactive(NFS_SERVER(data->dir)); iput(data->dir); put_rpccred(data->cred); kfree(data->args.name.name); @@ -116,6 +115,7 @@ static void nfs_async_unlink_release(void *calldata) struct nfs_unlinkdata *data = calldata; nfs_dec_sillycount(data->dir); + nfs_sb_deactive(NFS_SERVER(data->dir)); nfs_free_unlinkdata(data); } --=-JB8J0Rnqj+uhc3kuo5ga--