linux-kernel - Re: iov_iter

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Date:   Wed, 5 Apr 2017 18:02:50 -0400
From:   Dave Jones <davej@...emonkey.org.uk>
To:     Linux Kernel <linux-kernel@...r.kernel.org>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: 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