Date: Wed, 18 Apr 2007 04:10:13 GMT From: Kris Kennaway <kris@obsecurity.org> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/111766: "panic: ffs_blkfree: freeing free block" during disk activity Message-ID: <200704180410.l3I4ADlW040457@freefall.freebsd.org>
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The following reply was made to PR kern/111766; it has been noted by GNATS. From: Kris Kennaway <kris@obsecurity.org> To: Rong-En Fan <rafan@FreeBSD.org> Cc: Kris Kennaway <kris@obsecurity.org>, FreeBSD-gnats-submit@FreeBSD.org Subject: Re: kern/111766: "panic: ffs_blkfree: freeing free block" during disk activity Date: Wed, 18 Apr 2007 00:06:15 -0400 On Wed, Apr 18, 2007 at 12:01:53PM +0800, Rong-En Fan wrote: > On Tue, Apr 17, 2007 at 11:39:41PM -0400, Kris Kennaway wrote: > > On Wed, Apr 18, 2007 at 11:19:08AM +0800, Rong-En Fan wrote: > > > On our NFS server, this usually happens when one of the exported partitions > > > gets full. I have seen this on 4.x, 5.x and 6.x. And I'm pretty sure the > > > filesystem is in good state (I do fsck -fy every time after crash). The > > > disk in question is an external raid box. > > > > Interesting, can you repeat this on demand? > > I think I tried once but in vain. Some previous backtrace > at http://www.rafan.org/FreeBSD/panic/freeing_free_block/ > I haven't see this since last Oct, but the filesystem does not > get full recently (we got larger disks). Unfortunately I dont think the backtrace is very useful, it's reporting damage that occured at some earlier time. > > >From previous experience, usually the panic is triggered on > the full partition but I saw once or twice that it's triggered > on another non-full filesystem. I am not entirely sure whether it is really due to a full filesystem, because I've also come across it in random circumstances. I have also spent some time stressing full filesystems without causing the panic. If you can come up with a way to reliably produce it, that would be very useful (possibly essential). Kris
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