kernel crash in serial driver

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Hi, following two different crash i am getting in 4.1.15 kernel. Is there any patch available till latest kernel that i can apply to address this issue?

Call Trace:
    [<ffffffff8134a775>]     __uart_start.isra.9+0x15/0x40
    [<ffffffff8134a7da>]     uart_start+0x3a/0x60
    [<ffffffff81331086>]     n_tty_receive_buf_common+0x4c6/0xaf0
    [<ffffffff81334365>]     flush_to_ldisc+0xf5/0x1b0
    [<ffffffff8108414d>]     try_to_wake_up+0x1cd/0x2d0
    [<ffffffff81075049>]     process_one_work+0x139/0x350
    [<ffffffff810ac81c>]     try_to_del_timer_sync+0x4c/0x80
    [<ffffffff8107536b>]     worker_thread+0x10b/0x460
    [<ffffffff81075260>]     worker_thread+0x0/0x460
    [<ffffffff8107a888>]     kthread+0xc8/0xe0
    [<ffffffff8107a7c0>]     kthread+0x0/0xe0
    [<ffffffff816d5762>]     ret_from_fork+0x42/0x70
    [<ffffffff8107a7c0>]     kthread+0x0/0xe0
comm: kwork

Call Trace:
    [<ffffffff813488ba>]     uart_put_char+0x8a/0xb0
    [<ffffffff81348870>]     uart_put_char+0x40/0xb0
    [<ffffffff81328f1c>]     tty_put_char+0x1c/0x40
    [<ffffffff8132da50>]     do_output_char+0xa0/0x1f0
    [<ffffffff8132dcee>]     __process_echoes+0x14e/0x290
    [<ffffffff81331068>]     n_tty_receive_buf_common+0x4a8/0xaf0
    [<ffffffff81334365>]     flush_to_ldisc+0xf5/0x1b0
    [<ffffffff81075049>]     process_one_work+0x139/0x350
    [<ffffffff8100d784>]     __switch_to+0x224/0x600
    [<ffffffff8107536b>]     worker_thread+0x10b/0x460
    [<ffffffff816d13f8>]     __schedule+0x2d8/0x8e0
    [<ffffffff81075260>]     worker_thread+0x0/0x460
    [<ffffffff8107a888>]     kthread+0xc8/0xe0
    [<ffffffff8107a7c0>]     kthread+0x0/0xe0
    [<ffffffff816d5762>]     ret_from_fork+0x42/0x70
    [<ffffffff8107a7c0>]     kthread+0x0/0xe0
comm: kwork


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