Re: sk_lock: inconsistent {RECLAIM_FS-ON-W} -> {IN-RECLAIM_FS-W} usage

Wu Fengguang <fengguang.wu@...> wrote:
>
> This lockdep warning appears when doing stress memory tests over NFS.
>
> page reclaim => nfs_writepage => tcp_sendmsg => lock sk_lock
>
> tcp_close => lock sk_lock => tcp_send_fin => alloc_skb_fclone => page reclaim

Well perhaps not this particular path, but it is certainly possible
if an existing NFS socket dies and NFS tries to reestablish it.

I suggest that NFS should utilise the sk_allocation field and
set an appropriate value.  Note that you may have to patch TCP
so that it uses sk_allocation everywhere necessary, e.g., in
tcp_send_fin.

Cheers,
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