On Fri, Apr 11, 2008 at 04:07:16PM -0400, Trond Myklebust wrote: > > On Thu, 2008-04-10 at 13:54 +0200, Frank van Maarseveen wrote: > > FYI, > > > > On Thu, Mar 20, 2008 at 01:57:16PM +0100, Frank van Maarseveen wrote: > > > On Thu, Mar 20, 2008 at 08:47:13AM -0400, Trond Myklebust wrote: > > > > > > > > On Wed, 2008-03-19 at 10:49 +0100, Frank van Maarseveen wrote: > > > > > FYI, > > > > > > > > > > 2.6.24.3 wrote: > > > > > > kernel BUG at fs/nfs/pagelist.c:82! > > > > > > > > > > BUG_ON(PagePrivate(page)); [...] > > > > > The machine is a quad Xeon with 4GB ram with CONFIG_HIGHMEM64G=y > > > > > > > > Would that be on a file that was open for read and write, or is it > > > > possible that some other process was writing to the same file? If so, > > > > then it might be a bug in nfs_wb_page(). > > > > > > Yes, I'm quite sure it was a "tail -f" on a logfile which gets > > > continuously appended to by another process.. So, one process reads it > > > while another one writes to it through different descriptors/struct file. > > > > The problem occurred again on a different box under exactly the same > > userland conditions yielding exactly the same stack trace. Kernels are > > identical but no vmware modules this time. > > Just a quick question: how does your > 16 groups patch behave when it is > denied a write with an EACCES error? I've got a feeling that this may be > due to the page getting redirtied and the RPC call retried. If so, then > the following patch may help. The >16 groups patch doesn't do anything special with file I/O (credentials are determined at open time) and is not retrying anywhere upon error. It's just one process which writes a big logfile on NFS (also involving small writes) and a tail -f trying to catch up. The machine is heavily loaded at that time, probably both CPU and networking I/O (non-NFS). -- Frank -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
