[   57.926059] BUG: sleeping function called from invalid context at net/core/sock.c:2433
[   57.926948] in_atomic(): 1, irqs_disabled(): 0, pid: 4, name: kworker/0:0
[   58.045835]
[   58.046065] ======================================================
[   58.046742] [ INFO: possible circular locking dependency detected ]
[   58.047406] 4.4.8+ #10 Tainted: G        W  O
[   58.047891] -------------------------------------------------------
[   58.048559] runTests/1286 is trying to acquire lock:
[   58.049191]  (&pipe->mutex/1){+.+.+.}, at: [<ffffffff81277fd7>] pipe_lock_nested+0x17/0x1a
[   58.050437]
[   58.050437] but task is already holding lock:
[   58.051255]  (sk_lock-AF_DECnet){+.+.+.}, at: [<ffffffffc0000840>] lock_sock+0x1d/0x20 [af_ktls]
[   58.052545]
[   58.052545] which lock already depends on the new lock.
[   58.052545]
[   58.053585]
[   58.053585] the existing dependency chain (in reverse order) is:
[   58.054369]
-> #1 (sk_lock-AF_DECnet){+.+.+.}:
[   58.054920]        [<ffffffff81107d7e>] check_prevs_add+0xb7/0x17f
[   58.055580]        [<ffffffff81108366>] validate_chain+0x520/0x5cf
[   58.056237]        [<ffffffff8110b901>] __lock_acquire+0xa5c/0xb5d
[   58.056896]        [<ffffffff8110bbd5>] lock_acquire+0x1d3/0x200
[   58.057536]        [<ffffffff817f40a7>] lock_sock_nested+0x92/0xae
[   58.058209]        [<ffffffffc0000840>] lock_sock+0x1d/0x20 [af_ktls]
[   58.058899]        [<ffffffffc0003be7>] tls_sendpage+0x4b/0x2bd [af_ktls]
[   58.059613]        [<ffffffff817f0b1b>] kernel_sendpage+0x1b/0x24
[   58.060260]        [<ffffffff817f0b56>] sock_sendpage+0x32/0x36
[   58.060888]        [<ffffffff812a6127>] pipe_to_sendpage+0x73/0x90
[   58.061542]        [<ffffffff812a6007>] splice_from_pipe_feed+0x81/0x12e
[   58.062226]        [<ffffffff812a67ea>] __splice_from_pipe+0x5b/0x82
[   58.062879]        [<ffffffff812a86d1>] splice_from_pipe+0x5e/0x89
[   58.063511]        [<ffffffff812a8711>] generic_splice_sendpage+0x15/0x17
[   58.064248]        [<ffffffff812a5f62>] do_splice_from+0x22/0x24
[   58.064863]        [<ffffffff812a78e7>] do_splice+0x185/0x362
[   58.065479]        [<ffffffff812a89c4>] SyS_splice+0x92/0xf2
[   58.066048]        [<ffffffff819460f6>] entry_SYSCALL_64_fastpath+0x16/0x76
[   58.066739]
-> #0 (&pipe->mutex/1){+.+.+.}:
[   58.067227]        [<ffffffff81107526>] check_prev_add+0x174/0x915
[   58.067841]        [<ffffffff81107d7e>] check_prevs_add+0xb7/0x17f
[   58.068461]        [<ffffffff81108366>] validate_chain+0x520/0x5cf
[   58.069072]        [<ffffffff8110b901>] __lock_acquire+0xa5c/0xb5d
[   58.069685]        [<ffffffff8110bbd5>] lock_acquire+0x1d3/0x200
[   58.070298]        [<ffffffff81941dd1>] mutex_lock_nested+0x92/0x3e3
[   58.070912]        [<ffffffff81277fd7>] pipe_lock_nested+0x17/0x1a
[   58.071507]        [<ffffffff81277fed>] pipe_lock+0x13/0x15
[   58.072046]        [<ffffffff812a6365>] splice_to_pipe+0x2e/0x25a
[   58.072634]        [<ffffffffc0003314>] tls_splice_read+0x643/0x723 [af_ktls]
[   58.073316]        [<ffffffff817edd54>] sock_splice_read+0x22/0x2e
[   58.073913]        [<ffffffff812a6cc2>] do_splice_to+0x6f/0x84
[   58.074475]        [<ffffffff812a79cb>] do_splice+0x269/0x362
[   58.075031]        [<ffffffff812a89c4>] SyS_splice+0x92/0xf2
[   58.075581]        [<ffffffff819460f6>] entry_SYSCALL_64_fastpath+0x16/0x76
[   58.076225]
[   58.076225] other info that might help us debug this:
[   58.076225]
[   58.076952]  Possible unsafe locking scenario:
[   58.076952]
[   58.077490]        CPU0                    CPU1
[   58.077944]        ----                    ----
[   58.078362]   lock(sk_lock-AF_DECnet);
[   58.078740]                                lock(&pipe->mutex/1);
[   58.079339]                                lock(sk_lock-AF_DECnet);
[   58.079947]   lock(&pipe->mutex/1);
[   58.080333]
[   58.080333]  *** DEADLOCK ***
[   58.080333]
[   58.080878] 2 locks held by runTests/1286:
[   58.081256]  #0:  (&tsk->rx_lock){+.+.+.}, at: [<ffffffffc0002d99>] tls_splice_read+0xc8/0x723 [af_ktls]
[   58.082175]  #1:  (sk_lock-AF_DECnet){+.+.+.}, at: [<ffffffffc0000840>] lock_sock+0x1d/0x20 [af_ktls]