Crash dump with hso module and BCM2835 after rmmod

[Joona Järvelä]

Description: hso driver module for Option Globetrotter HSDPA Modem (0af0:6971)
Serial connection to modem does not work.

OS: Linux raspberrypi 4.9.28-v7+ #998 SMP Mon May 15 16:55:39 BST 2017 armv7l GNU/Linux

Log and dump:

Bus 001 Device 005: ID 0af0:6971 Option Globetrotter HSDPA Modem
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter
Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

[ 5.587057] usb 1-1.3: new full-speed USB device number 4 using dwc_otg
[ 5.719731] usb 1-1.3: New USB device found, idVendor=0af0, idProduct=6971
[ 5.719739] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 5.719743] usb 1-1.3: Product: Globetrotter HSDPA Modem
[ 5.719747] usb 1-1.3: Manufacturer: Option N.V.
[ 5.719751] usb 1-1.3: SerialNumber: Serial Number
[ 5.720474] usb-storage 1-1.3:1.0: USB Mass Storage device detected
[ 5.901719] Adding 102396k swap on /var/swap. Priority:-1 extents:6 across:307196k SSFS
[ 5.974591] usb-storage: probe of 1-1.3:1.0 failed with error -5
[ 6.056198] hso: drivers/net/usb/hso.c: Option Wireless
[ 6.056289] hso 1-1.3:1.0: Not our interface
[ 6.056349] usbcore: registered new interface driver hso
[ 6.061355] usb 1-1.3: USB disconnect, device number 4

[60070.495534] hso: unloaded
[60070.495561] usbcore: deregistering interface driver hso
[60070.499944] ------------[ cut here ]------------
[60070.499978] WARNING: CPU: 2 PID: 4409 at lib/kobject.c:690 kobject_put+0x7c/0x80
[60070.499986] kobject: '' (b71e2800): is not initialized, yet kobject_put() is being called.
[60070.499990] Modules linked in: bnep hci_uart btbcm bluetooth hso(-) brcmfmac brcmutil cfg80211 rfkill snd_bcm2835 snd_pcm snd_timer snd bcm2835_gpiomem uio_pdrv_genirq fixed uio ipv6
[60070.500073] CPU: 2 PID: 4409 Comm: rmmod Not tainted 4.9.28-v7+ #998
[60070.500078] Hardware name: BCM2835
[60070.500106] [<8010fb3c>] (unwind_backtrace) from [<8010c058>] (show_stack+0x20/0x24)
[60070.500122] [<8010c058>] (show_stack) from [<804552c0>] (dump_stack+0xd4/0x118)
[60070.500139] [<804552c0>] (dump_stack) from [<8011d2c4>] (__warn+0xf8/0x110)
[60070.500151] [<8011d2c4>] (__warn) from [<8011d324>] (warn_slowpath_fmt+0x48/0x50)
[60070.500166] [<8011d324>] (warn_slowpath_fmt) from [<804575ac>] (kobject_put+0x7c/0x80)
[60070.500185] [<804575ac>] (kobject_put) from [<80274b9c>] (cdev_del+0x38/0x3c)
[60070.500204] [<80274b9c>] (cdev_del) from [<804bea60>] (tty_unregister_device+0x54/0x60)
[60070.500247] [<804bea60>] (tty_unregister_device) from [<7f32dbc0>] (hso_free_interface+0xa4/0x180 [hso])
[60070.500313] [<7f32dbc0>] (hso_free_interface [hso]) from [<7f32dcb8>] (hso_disconnect+0x1c/0x28 [hso])
[60070.500352] [<7f32dcb8>] (hso_disconnect [hso]) from [<8055e8dc>] (usb_unbind_interface+0x8c/0x2a0)
[60070.500374] [<8055e8dc>] (usb_unbind_interface) from [<804fac9c>] (__device_release_driver+0x94/0x118)
[60070.500392] [<804fac9c>] (__device_release_driver) from [<804fae54>] (driver_detach+0xdc/0xe0)
[60070.500408] [<804fae54>] (driver_detach) from [<804f9f84>] (bus_remove_driver+0x5c/0xb0)
[60070.500424] [<804f9f84>] (bus_remove_driver) from [<804fb2b0>] (driver_unregister+0x38/0x58)
[60070.500441] [<804fb2b0>] (driver_unregister) from [<8055dc74>] (usb_deregister+0x74/0xe8)
[60070.500475] [<8055dc74>] (usb_deregister) from [<7f3302e8>] (hso_exit+0x38/0x40 [hso])
[60070.500515] [<7f3302e8>] (hso_exit [hso]) from [<801a1818>] (SyS_delete_module+0x184/0x1d0)
[60070.500534] [<801a1818>] (SyS_delete_module) from [<801080c0>] (ret_fast_syscall+0x0/0x1c)
[60070.500542] ---[ end trace 4873265f08e5ce69 ]---