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SubjectRe: Bug#328135: kernel-image-2.6.11-1-686-smp: nfs reading process stuck in disk wait
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on den 14.09.2005 Klokka 21:10 (-0400) skreiv Marc Horowitz:
> Trond Myklebust <trond.myklebust@fys.uio.no> writes:
>
> >> on den 14.09.2005 Klokka 11:51 (+0900) skreiv Horms:
> >> > Hi Marc,
> >> >
> >> > would is be possible to test linux-image-2.6.12-1-686-smp from
> >> > unstable to see if this problem persists? I am CCing the NFS
> >> > maintainer and LKML as this looks reasonably nasty and they
> >> > may be interested in looking into it.
> >> >
> >>
> >> I doubt this has anything to do with NFS. We should no longer have a
> >> sync_page VFS method in the 2.6 kernels. What other filesystems is the
> >> user running?
>
> In the stack trace I sent, from a running 2.6.11 kernel, vfs_read
> appears to be the vfs method, not sync_page. sync_page is called much
> deeper in the stack trace.

So? It is clearly the call to sync_page that is Oopsing.

The NFS call is just trying to lock a page that appears to be owned by
someone else. That triggers a call to that filesystem's sync_page, which
then goes on to do a page allocation, which again Oopses.

Cheers,
Trond

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