ucom_free Fatal trap on shutdown / module unload

[Lundberg, Johannes]

I added some logging to see what is going on and this is what I got (none
of the proposed solution solved the problem)

uhso_detach gets called 7 times (for oid 0-6). It crashes the 2nd time on
the call usbd_transfer_unsetup(sc->sc_xfer, 3);

--
Johannes Lundberg
BRILLIANTSERVICE CO., LTD.


On Mon, Jun 23, 2014 at 11:55 AM, Hans Petter Selasky <hps at selasky.org>
wrote:

> On 06/23/14 03:30, Lundberg, Johannes wrote:
>
>> Hi
>>
>> I tried replacing
>> DRIVER_MODULE(uhso, uhub, uhso_driver, uhso_devclass, uhso_driver_loaded,
>> 0);
>> with
>> DRIVER_MODULE_ORDERED(uhso, uhub, uhso_driver, uhso_devclass,
>> uhso_driver_loaded, 0, SI_ORDER_ANY);
>> but makes no difference..
>>
>> Don't know if its relevant but with ucom debug on I get a message just
>> before crash in method ucom_close that it tries to close a connection that
>> has already been closed.
>>
>>
> Hi Johannes,
>
> Try the opposite:
>
> DRIVER_MODULE_ORDERED(uhso, uhub, uhso_driver, uhso_devclass,
> uhso_driver_loaded, 0, SI_ORDER_MIDDLE + 1);
>
> Because I suspect that the "uhso_ifnet_unit" unrhdr is freed before the
> "fake" detach is executed:
>
>  static int
>> uhso_driver_loaded(struct module *mod, int what, void *arg)
>> {
>>         switch (what) {
>>         case MOD_LOAD:
>>                 /* register our autoinstall handler */
>>                 uhso_etag = EVENTHANDLER_REGISTER(usb_dev_configured,
>>                     uhso_test_autoinst, NULL, EVENTHANDLER_PRI_ANY);
>>                 /* create our unit allocator for inet devs */
>>                 uhso_ifnet_unit = new_unrhdr(0, INT_MAX, NULL);
>>                 break;
>>         case MOD_UNLOAD:
>>                 EVENTHANDLER_DEREGISTER(usb_dev_configured, uhso_etag);
>>                 delete_unrhdr(uhso_ifnet_unit);
>>                 break;
>>         default:
>>                 return (EOPNOTSUPP);
>>         }
>>         return (0);
>> }
>>
>
> Alternativly set "uhso_ifnet_unit" to NULL and check this in probe and
> attach!
>
> --HPS
>
> --HPS
>

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