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)

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