Re: USB gadgets with configfs hang reboot

[Ivaylo Dimitrov <ivo.g.dimitrov.75-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

Hi,

On 24.03.2016 08:50, Felipe Balbi wrote:
>
> Hi,
>
> Ivaylo Dimitrov <ivo.g.dimitrov.75-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
>> On 16.01.2016 12:40, Ivaylo Dimitrov wrote:
>>> Hi,
>>>
>>> On 16.01.2016 00:48, Tony Lindgren wrote:
>>>> Hi all,
>>>>
>>>> Looks like there's some issue with the USB gadgets and configfs.
>>>>
>>>> I'm seeing rmmod of the UDC driver cause a warning and then reboot
>>>> hangs the system. This happens at least with v4.4, and I've reproduced
>>>> it with dwc3 and musb so it seems to be generic.
>>>>
>>>
>>> Having configfs is not needed, disabling usb gadgets (#
>>> CONFIG_USB_MUSB_GADGET is not set) seems to solved at least poweroff
>>> hang issue on N900. Also, g_nokia is not a module in the config I use,
>>> so I guess the problem is not related whether gadgets are modular or
>>> not. Unfortunately I was not able to test reboot, as rootfs became
>>> corrupted after the first poweroff :( . So it looks like my theory that
>>> onenand corruption on N900 is because poweroff/reboot hangs is wrong.
>>>
>>> Ivo
>>
>>
>> Is there any progress on the issue?
>

Doing Nokia-N900:/sys/bus/platform/drivers/musb-hdrc# echo 
musb-hdrc.0.auto > unbind results in:

<1>[ 1418.511260] Unable to handle kernel paging request at virtual 
address 6c6c757a
<7>[ 1418.677215] pvr: Xorg: cleaning up 49 unfreed resources
<1>[ 1418.683349] pgd = c0004000
<1>[ 1418.739959] [6c6c757a] *pgd=00000000
<0>[ 1418.746307] Internal error: Oops: 5 [#1] PREEMPT ARM
<4>[ 1418.753997] Modules linked in: sha256_generic hmac drbg ansi_cprng 
ctr ccm vfat fat rfcomm sd_mod scsi_mod bnep bluetooth omaplfb pvrsrvkm 
ipv6 bq2415x_charger uinput radio_platform_si4713 joydev cmt_speech 
hsi_char video_bus_switch arc4 wl1251_spi wl1251 isp1704_charger 
gpio_keys mac80211 smc91x mii cfg80211 omap_wdt crc7 omap_sham tsc2005 
tsc200x_core bq27xxx_battery_i2c si4713 adp1653 tsl2563 leds_lp5523 
leds_lp55xx_common bq27xxx_battery rtc_twl twl4030_wdt et8ek8 ad5820 
v4l2_common smiaregs twl4030_vibra videodev ff_memless lis3lv02d_i2c 
lis3lv02d media input_polldev omap_ssi_port ti_soc_thermal nokia_modem 
ssi_protocol omap_ssi hsi rx51_battery
<4>[ 1418.835906] CPU: 0 PID: 53 Comm: file-storage Not tainted 
4.5.0-rc5+ #59
<4>[ 1418.846130] Hardware name: Nokia RX-51 board
<4>[ 1418.853820] task: ceb8a300 ti: ce008000 task.ti: ce008000
<4>[ 1418.862792] PC is at handle_exception+0xa8/0x418
<4>[ 1418.871002] LR is at recalc_sigpending+0x18/0x7c
<4>[ 1418.879241] pc : [<c031d0e4>]    lr : [<c0037b84>]    psr: 80000013
<4>[ 1418.879241] sp : ce009ea0  ip : 00000000  fp : 00000000
<4>[ 1418.898284] r10: 00000000  r9 : 00000000  r8 : 00000000
<4>[ 1418.907287] r7 : c031d8d0  r6 : 6c6c7566  r5 : 00000000  r4 : cebe1600
<4>[ 1418.917663] r3 : 6f642820  r2 : 00000000  r1 : 00000000  r0 : 00000000
<4>[ 1418.928039] Flags: Nzcv  IRQs on  FIQs on  Mode SVC_32  ISA ARM 
Segment none
<4>[ 1418.939025] Control: 10c5387d  Table: 8e244019  DAC: 00000051
<0>[ 1418.948516] Process file-storage (pid: 53, stack limit = 0xce008210)
<0>[ 1418.958679] Stack: (0xce009ea0 to 0xce00a000)
<0>[ 1418.966735] 9ea0: 0000000f 00000000 00000000 00000b07 00000000 
00000001 000003ff 00000001
<0>[ 1418.978973] 9ec0: ceb8a300 ceb8a300 00000000 c004841c 00000000 
00000002 ce888000 c0451a50
<0>[ 1418.991180] 9ee0: ffffffff 00000000 00000000 00000008 cebe1600 
00000001 c0717dd0 00000001
<0>[ 1419.003387] 9f00: 00000000 00000000 ce009f14 c044ddf4 00000000 
c031c020 00000042 ce009f30
<0>[ 1419.015686] 9f20: ce009f30 00000000 cebe1600 c031d958 00000000 
c044d864 a0000013 00000000
<0>[ 1419.027923] 9f40: cebe1600 c031d8d0 cebfa100 cebfa100 00000000 
cebe1600 c031d8d0 00000000
<0>[ 1419.040130] 9f60: 00000000 00000000 00000000 c00474e4 dc4d900d 
00000000 31bc92e7 cebe1600
<0>[ 1419.052429] 9f80: 00000000 ce009f84 ce009f84 00000000 ce009f90 
ce009f90 ce009fac cebfa100
<0>[ 1419.064697] 9fa0: c0047418 00000000 00000000 c000f218 00000000 
00000000 00000000 00000000
<0>[ 1419.076934] 9fc0: 00000000 00000000 00000000 00000000 00000000 
00000000 00000000 00000000
<0>[ 1419.089050] 9fe0: 00000000 00000000 00000000 00000000 00000013 
00000000 00002000 30000891
<4>[ 1419.101043] [<c031d0e4>] (handle_exception) from [<c031d958>] 
(fsg_main_thread+0x88/0x13dc)
<4>[ 1419.113189] [<c031d958>] (fsg_main_thread) from [<c00474e4>] 
(kthread+0xcc/0xe0)
<4>[ 1419.124267] [<c00474e4>] (kthread) from [<c000f218>] 
(ret_from_fork+0x14/0x3c)
<0>[ 1419.135101] Code: 1a000015 ea000040 e5946038 e0866285 (e5963014)
<4>[ 1419.330841] ---[ end trace 3377457e25b0732c ]---
<0>[ 1419.340972] Kernel panic - not syncing: Fatal exception

weirdly, I have that log only in mtdoops, but not in dmesg. However, 
after that oops "reboot" command does not hang, but reboots the device.

Regards,
Ivo

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