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    SubjectRe: iov_iter_pipe warning.
    On Tue, Mar 21, 2017 at 04:59:01PM -0400, Dave Jones wrote:
    > WARNING: CPU: 0 PID: 9290 at lib/iov_iter.c:836 iov_iter_pipe+0x71/0x80
    > CPU: 0 PID: 9290 Comm: trinity-c7 Not tainted 4.11.0-rc3-think+ #3
    > Call Trace:
    > dump_stack+0x68/0x93
    > __warn+0xcb/0xf0
    > warn_slowpath_null+0x1d/0x20
    > iov_iter_pipe+0x71/0x80
    > generic_file_splice_read+0x37/0x140
    > do_splice_to+0x79/0x90
    > splice_direct_to_actor+0xb8/0x220
    > ? generic_pipe_buf_nosteal+0x10/0x10
    > do_splice_direct+0x9e/0xd0
    > do_sendfile+0x1d7/0x3c0
    > SyS_sendfile64+0x73/0xe0
    > do_syscall_64+0x66/0x1d0
    > entry_SYSCALL64_slow_path+0x25/0x25
    > RIP: 0033:0x7f86804bf0f9
    > RSP: 002b:00007ffd5e613038 EFLAGS: 00000246
    > ORIG_RAX: 0000000000000028
    > RAX: ffffffffffffffda RBX: 0000000000000028 RCX: 00007f86804bf0f9
    > RDX: 00007f867e92a000 RSI: 000000000000018b RDI: 000000000000011b
    > RBP: 00007f8680b5d000 R08: 0000000000000000 R09: ffffffffffffff5b
    > R10: 0000000000221200 R11: 0000000000000246 R12: 0000000000000002
    > R13: 00007f8680b5d048 R14: 00007f8680b95ad8 R15: 00007f8680b5d000
    > ---[ end trace e50d88214985fd43 ]---
    >
    >
    > 836 WARN_ON(pipe->nrbufs == pipe->buffers);

    Still hitting this regularly. Takes a couple hours usually, but it seems to be
    the only thing that falls out of trinity runs lately.

    Dave

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