`rmmod` command hangs after talpa_syscallhook_unregister+0x85/0xd0 [talpa_syscallhook]

Issue

• rmmod command hangs with the following messages.

kernel: INFO: task rmmod:9447 blocked for more than 120 seconds.
kernel:      Tainted: P           ---------------    2.6.32-431.66.1.el6.x86_64 #1
kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kernel: rmmod         D 000000000000000a     0  9447   9409 0x00000080
kernel: ffff88042b7f9e18 0000000000000086 0000000000000000 0000000000000286
kernel: ffff880473b88500 ffff880477411480 ffff880474362f00 0000000000000006
kernel: ffff880442729ab8 ffff88042b7f9fd8 000000000000ebc8 ffff880442729ab8
kernel: Call Trace:
kernel: [<ffffffffa01ee4f5>] talpa_syscallhook_unregister+0x85/0xd0 [talpa_syscallhook]
kernel: [<ffffffff8109af80>] ? autoremove_wake_function+0x0/0x40
kernel: [<ffffffff8152a8be>] ? mutex_lock+0x1e/0x50
kernel: [<ffffffffa0293b5f>] deleteVFSHookInterceptor+0x3f/0x250 [talpa_vfshook]
kernel: [<ffffffffa0296873>] talpa_vfshook_exit+0x2f/0x31 [talpa_vfshook]
kernel: [<ffffffff810b9194>] sys_delete_module+0x194/0x260
kernel: [<ffffffff8100b072>] system_call_fastpath+0x16/0x1b