Can't remove g_multi

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Nuno Gonçalves

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May 5, 2015, 10:11:40 AM5/5/15
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Beaglebone white
Linux beaglebone 4.0.1-bone1 #1 Wed Apr 29 21:13:22 UTC 2015 armv7l GNU/Linux

"sudo modprobe -r g_multi" hangs forever.

Running lsmod after (note the -1):

Module                  Size  Used by
usb_f_acm               6906  1 
u_serial                9898  3 usb_f_acm
usb_f_ecm               9489  1 
g_multi                 5497  -1 
usb_f_mass_storage     41986  1 g_multi
usb_f_rndis            22439  2 g_multi
u_ether                11002  3 usb_f_ecm,usb_f_rndis,g_multi
libcomposite           43035  5 usb_f_acm,usb_f_ecm,usb_f_rndis,g_multi,usb_f_mass_storage
omap_aes               12947  0 
omap_sham              19034  0 
omap_rng                4334  0 
rng_core                6186  1 omap_rng
uio_pdrv_genirq         3309  0 
uio                     8318  1 uio_pdrv_genirq


And journalctl:

May 05 13:58:07 beaglebone kernel: INFO: task modprobe:419 blocked for more than 120 seconds.
May 05 13:58:07 beaglebone kernel:       Not tainted 4.0.1-bone1 #1
May 05 13:58:07 beaglebone kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
May 05 13:58:07 beaglebone kernel: modprobe        D c05f1c79     0   419    418 0x00000001
May 05 13:58:07 beaglebone kernel: [<c05f1c79>] (__schedule) from [<c05f1ea7>] (schedule+0x2f/0x64)
May 05 13:58:07 beaglebone kernel: [<c05f1ea7>] (schedule) from [<bf8951e7>] (gserial_free_port+0x3e/0x94 [u_serial])
May 05 13:58:07 beaglebone kernel: [<bf8951e7>] (gserial_free_port [u_serial]) from [<bf895279>] (gserial_free_line+0x3c/0x64 [u_serial])
May 05 13:58:07 beaglebone kernel: [<bf895279>] (gserial_free_line [u_serial]) from [<bf89c683>] (acm_free_instance+0x12/0x1c [usb_f_acm])
May 05 13:58:07 beaglebone kernel: [<bf89c683>] (acm_free_instance [usb_f_acm]) from [<bf85185f>] (usb_put_function_instance+0x12/0x1c [libcomposite])
May 05 13:58:07 beaglebone kernel: [<bf85185f>] (usb_put_function_instance [libcomposite]) from [<bf88802f>] (multi_unbind+0x2e/0x4c [g_multi])
May 05 13:58:07 beaglebone kernel: [<bf88802f>] (multi_unbind [g_multi]) from [<bf85169b>] (__composite_unbind+0x3e/0x68 [libcomposite])
May 05 13:58:07 beaglebone kernel: [<bf85169b>] (__composite_unbind [libcomposite]) from [<bf8516d3>] (composite_unbind+0xe/0x10 [libcomposite])
May 05 13:58:07 beaglebone kernel: [<bf8516d3>] (composite_unbind [libcomposite]) from [<c047d0d3>] (usb_gadget_remove_driver+0x3f/0x6c)
May 05 13:58:07 beaglebone kernel: [<c047d0d3>] (usb_gadget_remove_driver) from [<c047d149>] (usb_gadget_unregister_driver+0x49/0x7c)
May 05 13:58:07 beaglebone kernel: [<c047d149>] (usb_gadget_unregister_driver) from [<bf8500bb>] (usb_composite_unregister+0xe/0x10 [libcomposite])
May 05 13:58:07 beaglebone kernel: [<bf8500bb>] (usb_composite_unregister [libcomposite]) from [<bf88805b>] (multi_driver_exit+0xe/0x10 [g_multi])
May 05 13:58:07 beaglebone kernel: [<bf88805b>] (multi_driver_exit [g_multi]) from [<c006f617>] (SyS_delete_module+0xdf/0x178)
May 05 13:58:07 beaglebone kernel: [<c006f617>] (SyS_delete_module) from [<c000d6a1>] (ret_fast_syscall+0x1/0x44)

Robert Nelson

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May 5, 2015, 10:17:19 AM5/5/15
to Beagle Board
systemd has getty running on u_serial (which gets loaded by
g_multi).... So just remove the 'modprobe g_multi" from:

/opt/scripts/boot/am335_evm.sh

Regards,

--
Robert Nelson
https://rcn-ee.com/
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