> Sure. In addition to what you did above, please do
quoted text
>
> mount -t debugfs none /sys/kernel/debug
>
> and then cat the contents of the pseudofile at
>
> /sys/kernel/debug/tracing/stack_trace
>
> Please do this more or less immediately after you've finished mounting
> the NFSv4 client.
>   

I've uploaded the stack trace. It was generated
directly after mounting. Here are the stacks:

After mounting:
https://bugzilla.kernel.org/attachment.cgi?id=26153
After the soft lockup:
https://bugzilla.kernel.org/attachment.cgi?id=26154
The dmesg output of the soft lockup:
https://bugzilla.kernel.org/attachment.cgi?id=26155

quoted text
> Does your server have the 'crossmnt' or 'nohide' flags set, or does it
> use the 'refer' export option anywhere? If so, then we might have to
> test further, since those may trigger the NFSv4 submount feature.
>   
The server has the following settings:
rw,nohide,insecure,async,no_subtree_check,no_root_squash

Thanks!
Robert


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