From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from aserp2130.oracle.com ([141.146.126.79]:33980 "EHLO aserp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751497AbeD3W0b (ORCPT ); Mon, 30 Apr 2018 18:26:31 -0400 Date: Mon, 30 Apr 2018 15:26:28 -0700 From: "Darrick J. Wong" Subject: Re: statvfs() return large f_bavail on a 10TB drive Message-ID: <20180430222628.GA22891@magnolia> References: <20180413154313.GC32099@magnolia> <3bd0697599c117cfd4db6431a2cba270@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <3bd0697599c117cfd4db6431a2cba270@mail.gmail.com> Sender: linux-xfs-owner@vger.kernel.org List-ID: List-Id: xfs To: Kirubakaran Kaliannan Cc: linux-xfs@vger.kernel.org On Mon, Apr 23, 2018 at 09:56:58AM +0530, Kirubakaran Kaliannan wrote: > Hi Darrick, > > Yes this looks like the bitflip ! > Do you have seen any occurrence of this before or maybe something related to > a in-memory corruption ? Usually only on machines with bad memory or use-after-free bugs in the kernel. --D > Thaks > -kiru > > -----Original Message----- > From: Darrick J. Wong [mailto:darrick.wong@oracle.com] > Sent: Friday, April 13, 2018 9:13 PM > To: Kirubakaran Kaliannan > Cc: linux-xfs@vger.kernel.org > Subject: Re: statvfs() return large f_bavail on a 10TB drive > > On Fri, Apr 13, 2018 at 12:10:19PM +0530, Kirubakaran Kaliannan wrote: > > Hi All, > > > > I have couple of xfs filesystem on a 10TB STAT drive. > > > > After 50% of filesystem is full, the df –kH is returning a large f_bavail. > > > > > > Filesystem Size Used Avail Use% Mounted on > > /dev/dm-4 10T -12T 22T - /mnt/a > > /dev/dm-3 10T -12T 22T - /mnt/b > > > > I tried statvfs() and got the same large f_bavail as well, > > > > total filesystem size = 9763506176 KB > > total Available size = 21279656740 KB > > 21279656740KB = 0x100000000000 | (about 50% of the space) ? > > Bitflip? > > --D > > > total used size = -11516150564 KB > > > > We are using Ubuntu 3.18.19 Linux kernel/xfs. > > > > If I unmount and mount the filesysem back, the f_bavail values are back to > > normal. > > > > Can you please point me, if this is something a known issue got fixed in > > XFS in the later version, or any lead may help. > > It is difficult at this point of time to upgrade the XFS for this specific > > issue. > > > > Thanks, > > -kiru > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-xfs" in > > the body of a message to majordomo@vger.kernel.org > > More majordomo info at http://vger.kernel.org/majordomo-info.html