Re: [PATCH v2 1/5] nfsd: prevent callback tasks running concurrently

[ChenXiaoSong]

在 2025/6/10 19:09, Jeff Layton 写道:
> Synchronization was probably too strong a word. I remember looking over
> this code and convincing myself that the probe callback wasn't subject
> to the same races as the others, but I think that was mostly because
> the outcome of those races was not harmful. Note that the probe itself
> can actually be run at the start of a completely unrelated callback to
> the same client.
>
> So you hit a NULL pointer in __queue_work()? The work_struct is
> embedded in the nfs4_client so that would probably imply that that the
> nfs4_client struct was corrupt?
>
> You may want to get a vmcore and analyze it if you can reproduce this.

Thanks for your reply.

I have already got a vmcore. Here is the link to the vmcore analysis:

https://chenxiaosong.com/en/nfs/en-null-ptr-deref-in-nfsd4_probe_callback.html

Please let me know if you need any more detailed information.

Thanks,
ChenXiaoSong.