Dexuan Cui <decui@xxxxxxxxxxxxx> writes:
> Hi Vitaly,
> We got the below warning once -- it's pretty hard to repro it.
>
> I think the cause may be: before the daemon is terminated, we can successfully
> "rmmod hv_utils" -- as a result all the code/data segments of the module
> shouldn't be accessed any more, but in the kernel we still has a dangling
> pointer set up by hvt_op_poll() -> poll_wait(file, &hvt->outmsg_q, wait);
>
> Finally, when the daemon is terminated, the call trace could happen.
>
> I think the module should never be unloaded when there is a fd opened
> on /dev/vmbus/hv_kvp?
Yes, I was pretty sure .owner = THIS_MODULE does that.
There was a fix from Alex a month ago:
commit e66853b09017a788dc384dadce9323396dae3293
Author: Alex Ng <alexng@xxxxxxxxxxxxx>
Date: Fri Feb 26 15:13:20 2016 -0800
Drivers: hv: utils: Remove util transport handler from list if
registration fails
Do you have it in your kernel? (though I think it only applies if
transport registration fails...)
I'll take a closer look anyway, thanks for the report!
--
Vitaly
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