Hi Otavio, On 2/21/2020 6:07 PM, Otavio Salvador wrote: > On Fri, Feb 21, 2020 at 11:06 AM Otavio Salvador > <otavio@xxxxxxxxxxxxxxxx> wrote: >> On Fri, Feb 21, 2020 at 3:52 AM Minas Harutyunyan >> <Minas.Harutyunyan@xxxxxxxxxxxx> wrote: >>> On 2/20/2020 5:16 PM, Otavio Salvador wrote: >>>> Hello Minas, >>>> >>>> Thanks for all your help on this, ... >>>> >>>> On Thu, Feb 20, 2020 at 3:59 AM Minas Harutyunyan >>>> <Minas.Harutyunyan@xxxxxxxxxxxx> wrote: >>>>> >>>>> On 2/19/2020 7:10 PM, Otavio Salvador wrote: >>>> ... >>>>>> What sequence do you want us to do? >>>>> >>> Please provide dwc2 debug log when stop working with g_serial exception >>> dump inside. >>> Also provide dwc2 log when it's work without issue. >> >> Attached. > Reviewed all logs. Not found any dwc2 related issue. Not able to reproduce on my setup. My log on rmmod g_serial: [68784.817773] g_serial gadget: reset config [68784.817775] g_serial gadget: acm ttyGS0 deactivated [68784.817779] dwc2 dwc2.1.auto: dwc2_hsotg_ep_disable(ep 000000005e9ae420) [68784.817784] dwc2 dwc2.1.auto: dwc2_hsotg_ep_disable: DxEPCTL=0x08080200 [68784.817791] dwc2 dwc2.1.auto: dwc2_hsotg_ep_disable(ep 00000000e6730f2b) [68784.817796] dwc2 dwc2.1.auto: dwc2_hsotg_ep_disable: DxEPCTL=0x08880200 [68784.817805] dwc2 dwc2.1.auto: dwc2_hsotg_ep_disable(ep 00000000cef05e9b) [68784.817809] dwc2 dwc2.1.auto: dwc2_hsotg_ep_disable: DxEPCTL=0x084c000a [68784.817820] g_serial gadget: acm ttyGS0 deactivated [68784.817894] usb 5-4: USB disconnect, device number 6 [68784.817975] dwc2 dwc2.1.auto: dwc2_hsotg_ep_disable(ep 00000000e6730f2b) [68784.817980] dwc2 dwc2.1.auto: dwc2_hsotg_ep_disable: DxEPCTL=0x088a0200 Pay attention g_serial twice performing ttySG0 deactivation. In my setup second deactivation passed Ok, but in your case exception back trace print out with NULL pointer de-reference on spin_lock_irq. Could you please add debug print before spin_lock_irq() in function gs_close() in file u_serial.c to check tty, tty->driver_data. Are these vars NULL or no. Just rmmod g_serial case fully enough. Thanks, Minas > Forgot to attach the files. >
