#1 INFO: task accel-pppd:7555 blocked for more than 120 seconds

[paol]

accel-ppp - 1.9.0
kernel - 4.2.0

kernel: INFO: task accel-pppd:2155 blocked for more than 120 seconds.
kernel: Not tainted 4.2.0 #1
kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kernel: accel-pppd D ffff88021fc94680 0 2155 1 0x00000000
kernel: ffff8800d337bcb8 0000000000000082 ffff8800d337bc88 ffff8802161769c0
kernel: ffff8800d337c000 ffff8802159c2340 ffff8800d337bc98 ffff8800d337c000
kernel: ffff8802159c2340 ffffffff81a9d264 ffffffff81a9d268 00000000ffffffff
kernel: Call Trace:
kernel: [<ffffffff815ceb86>] schedule+0x71/0x80
kernel: [<ffffffff815cecbc>] schedule_preempt_disabled+0x9/0xb
kernel: [<ffffffff815cf918>] mutex_lock_slowpath+0xa6/0x104
kernel: [<ffffffff81116ece>] ? full_name_hash+0x19/0x63
kernel: [<ffffffff815cf989>] mutex_lock+0x13/0x24
kernel: [<ffffffff814ca63c>] rtnl_lock+0x10/0x12
kernel: [<ffffffff8154c918>] devinet_ioctl+0x108/0x552
kernel: [<ffffffff8154da2a>] inet_ioctl+0x87/0xa4
kernel: [<ffffffff814a8bad>] sock_do_ioctl+0x21/0x40
kernel: [<ffffffff814a8fc8>] sock_ioctl+0x1ee/0x1fd
kernel: [<ffffffff8111d8de>] do_vfs_ioctl+0x418/0x460
kernel: [<ffffffff811250c2>] ? fget+0x2a/0x69
kernel: [<ffffffff8111d974>] SyS_ioctl+0x4e/0x7e
kernel: [<ffffffff815d0fd7>] entry_SYSCALL_64_fastpath+0x12/0x6a

[xeb]

can't say anything
probably some kernel bug