----- Original Message -----
> One warning just pop up while running trinity.
Another run triggered a lockdep with splice in the trace,
[ 4787.875980]
[ 4787.877645] ======================================================
[ 4787.884540] [ INFO: possible circular locking dependency detected ]
[ 4787.891533] 4.8.0-rc8-usrns-scale+ #8 Tainted: G W
[ 4787.898138] -------------------------------------------------------
[ 4787.905130] trinity-c116/106905 is trying to acquire lock:
[ 4787.911251] (&p->lock){+.+.+.}, at: [<ffffffff812aca8c>] seq_read+0x4c/0x3e0
[ 4787.919264]
[ 4787.919264] but task is already holding lock:
[ 4787.925773] (sb_writers#8){.+.+.+}, at: [<ffffffff81284367>] __sb_start_write+0xb7/0xf0
[ 4787.934854]
[ 4787.934854] which lock already depends on the new lock.
[ 4787.934854]
[ 4787.943981]
[ 4787.943981] the existing dependency chain (in reverse order) is:
[ 4787.952333]
-> #3 (sb_writers#8){.+.+.+}:
[ 4787.957050] [<ffffffff810fd711>] __lock_acquire+0x3f1/0x7f0
[ 4787.963960] [<ffffffff810fe166>] lock_acquire+0xd6/0x240
[ 4787.970577] [<ffffffff810f769a>] percpu_down_read+0x4a/0xa0
[ 4787.977487] [<ffffffff81284367>] __sb_start_write+0xb7/0xf0
[ 4787.984395] [<ffffffff812a8974>] mnt_want_write+0x24/0x50
[ 4787.991110] [<ffffffffa05049af>] ovl_want_write+0x1f/0x30 [overlay]
[ 4787.998799] [<ffffffffa05070c2>] ovl_do_remove+0x42/0x4a0 [overlay]
[ 4788.006483] [<ffffffffa0507536>] ovl_rmdir+0x16/0x20 [overlay]
[ 4788.013682] [<ffffffff8128d357>] vfs_rmdir+0xb7/0x130
[ 4788.020009] [<ffffffff81292ed3>] do_rmdir+0x183/0x1f0
[ 4788.026335] [<ffffffff81293cf2>] SyS_unlinkat+0x22/0x30
[ 4788.032853] [<ffffffff81003f8c>] do_syscall_64+0x6c/0x1e0
[ 4788.039576] [<ffffffff817d927f>] return_from_SYSCALL_64+0x0/0x7a
[ 4788.046962]
-> #2 (&sb->s_type->i_mutex_key#16){++++++}:
[ 4788.053140] [<ffffffff810fd711>] __lock_acquire+0x3f1/0x7f0
[ 4788.060049] [<ffffffff810fe166>] lock_acquire+0xd6/0x240
[ 4788.066664] [<ffffffff817d60e7>] down_read+0x47/0x70
[ 4788.072893] [<ffffffff8128ce79>] lookup_slow+0xc9/0x200
[ 4788.079410] [<ffffffff81290b9c>] walk_component+0x1ec/0x310
[ 4788.086315] [<ffffffff81290e5f>] link_path_walk+0x19f/0x5f0
[ 4788.093219] [<ffffffff8129151d>] path_openat+0xdd/0xb80
[ 4788.099748] [<ffffffff81293511>] do_filp_open+0x91/0x100
[ 4788.106362] [<ffffffff81286f56>] do_open_execat+0x76/0x180
[ 4788.113186] [<ffffffff8128747b>] open_exec+0x2b/0x50
[ 4788.119404] [<ffffffff812ec61d>] load_elf_binary+0x28d/0x1120
[ 4788.126511] [<ffffffff81288487>] search_binary_handler+0x97/0x1c0
[ 4788.134002] [<ffffffff81289619>] do_execveat_common.isra.36+0x6a9/0x9f0
[ 4788.142071] [<ffffffff81289c4a>] SyS_execve+0x3a/0x50
[ 4788.148398] [<ffffffff81003f8c>] do_syscall_64+0x6c/0x1e0
[ 4788.155110] [<ffffffff817d927f>] return_from_SYSCALL_64+0x0/0x7a
[ 4788.162502]
-> #1 (&sig->cred_guard_mutex){+.+.+.}:
[ 4788.168179] [<ffffffff810fd711>] __lock_acquire+0x3f1/0x7f0
[ 4788.175085] [<ffffffff810fe166>] lock_acquire+0xd6/0x240
[ 4788.181712] [<ffffffff817d4557>] mutex_lock_killable_nested+0x87/0x500
[ 4788.189695] [<ffffffff81099599>] mm_access+0x29/0xa0
[ 4788.195924] [<ffffffff81302b6c>] proc_pid_auxv+0x1c/0x70
[ 4788.202540] [<ffffffff813039d0>] proc_single_show+0x50/0x90
[ 4788.209445] [<ffffffff812acb48>] seq_read+0x108/0x3e0
[ 4788.215774] [<ffffffff8127fb07>] __vfs_read+0x37/0x150
[ 4788.222198] [<ffffffff81280d35>] vfs_read+0x95/0x140
[ 4788.228425] [<ffffffff81282268>] SyS_read+0x58/0xc0
[ 4788.234557] [<ffffffff81003f8c>] do_syscall_64+0x6c/0x1e0
[ 4788.241268] [<ffffffff817d927f>] return_from_SYSCALL_64+0x0/0x7a
[ 4788.248660]
-> #0 (&p->lock){+.+.+.}:
[ 4788.252987] [<ffffffff810fc062>] validate_chain.isra.37+0xe72/0x1150
[ 4788.260769] [<ffffffff810fd711>] __lock_acquire+0x3f1/0x7f0
[ 4788.267676] [<ffffffff810fe166>] lock_acquire+0xd6/0x240
[ 4788.274302] [<ffffffff817d3807>] mutex_lock_nested+0x77/0x430
[ 4788.281406] [<ffffffff812aca8c>] seq_read+0x4c/0x3e0
[ 4788.287633] [<ffffffff81316b39>] kernfs_fop_read+0x129/0x1b0
[ 4788.294659] [<ffffffff8127fca3>] do_loop_readv_writev+0x83/0xc0
[ 4788.301954] [<ffffffff812811a8>] do_readv_writev+0x218/0x240
[ 4788.308959] [<ffffffff81281209>] vfs_readv+0x39/0x50
[ 4788.315188] [<ffffffff812bc6b1>] default_file_splice_read+0x1a1/0x2b0
[ 4788.323070] [<ffffffff812bc206>] do_splice_to+0x76/0x90
[ 4788.329587] [<ffffffff812bc2db>] splice_direct_to_actor+0xbb/0x220
[ 4788.337173] [<ffffffff812bc4d8>] do_splice_direct+0x98/0xd0
[ 4788.344078] [<ffffffff81281dd1>] do_sendfile+0x1d1/0x3b0
[ 4788.350694] [<ffffffff812829c9>] SyS_sendfile64+0xc9/0xd0
[ 4788.357405] [<ffffffff81003f8c>] do_syscall_64+0x6c/0x1e0
[ 4788.364119] [<ffffffff817d927f>] return_from_SYSCALL_64+0x0/0x7a
[ 4788.371511]
[ 4788.371511] other info that might help us debug this:
[ 4788.371511]
[ 4788.380443] Chain exists of:
&p->lock --> &sb->s_type->i_mutex_key#16 --> sb_writers#8
[ 4788.389881] Possible unsafe locking scenario:
[ 4788.389881]
[ 4788.396497] CPU0 CPU1
[ 4788.401549] ---- ----
[ 4788.406614] lock(sb_writers#8);
[ 4788.410352] lock(&sb->s_type->i_mutex_key#16);
[ 4788.418354] lock(sb_writers#8);
[ 4788.424902] lock(&p->lock);
[ 4788.428229]
[ 4788.428229] *** DEADLOCK ***
[ 4788.428229]
[ 4788.434836] 1 lock held by trinity-c116/106905:
[ 4788.439888] #0: (sb_writers#8){.+.+.+}, at: [<ffffffff81284367>] __sb_start_write+0xb7/0xf0
[ 4788.449473]
[ 4788.449473] stack backtrace:
[ 4788.454334] CPU: 16 PID: 106905 Comm: trinity-c116 Tainted: G W 4.8.0-rc8-usrns-scale+ #8
[ 4788.464719] Hardware name: Intel Corporation S2600WTT/S2600WTT, BIOS GRNDSDP1.86B.0044.R00.1501191641 01/19/2015
[ 4788.476076] 0000000000000086 00000000cbfc6314 ffff8803ce78b760 ffffffff813d5e93
[ 4788.484371] ffffffff82a3fbd0 ffffffff82a94890 ffff8803ce78b7a0 ffffffff810fa6ec
[ 4788.492663] ffff8803ce78b7e0 ffff8802ead08000 0000000000000001 ffff8802ead08ca0
[ 4788.500966] Call Trace:
[ 4788.503694] [<ffffffff813d5e93>] dump_stack+0x85/0xc2
[ 4788.509426] [<ffffffff810fa6ec>] print_circular_bug+0x1ec/0x260
[ 4788.516128] [<ffffffff810fc062>] validate_chain.isra.37+0xe72/0x1150
[ 4788.523319] [<ffffffff811d4491>] ? ___perf_sw_event+0x171/0x290
[ 4788.530022] [<ffffffff810fd711>] __lock_acquire+0x3f1/0x7f0
[ 4788.536335] [<ffffffff810fe166>] lock_acquire+0xd6/0x240
[ 4788.542359] [<ffffffff812aca8c>] ? seq_read+0x4c/0x3e0
[ 4788.548188] [<ffffffff812aca8c>] ? seq_read+0x4c/0x3e0
[ 4788.554019] [<ffffffff817d3807>] mutex_lock_nested+0x77/0x430
[ 4788.560528] [<ffffffff812aca8c>] ? seq_read+0x4c/0x3e0
[ 4788.566358] [<ffffffff812aca8c>] seq_read+0x4c/0x3e0
[ 4788.571995] [<ffffffff81316a10>] ? kernfs_fop_open+0x3a0/0x3a0
[ 4788.578600] [<ffffffff81316b39>] kernfs_fop_read+0x129/0x1b0
[ 4788.585012] [<ffffffff81316a10>] ? kernfs_fop_open+0x3a0/0x3a0
[ 4788.591617] [<ffffffff8127fca3>] do_loop_readv_writev+0x83/0xc0
[ 4788.598318] [<ffffffff81316a10>] ? kernfs_fop_open+0x3a0/0x3a0
[ 4788.604924] [<ffffffff812811a8>] do_readv_writev+0x218/0x240
[ 4788.611347] [<ffffffff813e9535>] ? push_pipe+0xd5/0x190
[ 4788.617278] [<ffffffff813ecec0>] ? iov_iter_get_pages_alloc+0x250/0x400
[ 4788.624746] [<ffffffff81281209>] vfs_readv+0x39/0x50
[ 4788.630381] [<ffffffff812bc6b1>] default_file_splice_read+0x1a1/0x2b0
[ 4788.637668] [<ffffffff8134ae20>] ? security_file_permission+0xa0/0xc0
[ 4788.644954] [<ffffffff812bc206>] do_splice_to+0x76/0x90
[ 4788.650880] [<ffffffff812bc2db>] splice_direct_to_actor+0xbb/0x220
[ 4788.657872] [<ffffffff812bba80>] ? generic_pipe_buf_nosteal+0x10/0x10
[ 4788.665157] [<ffffffff812bc4d8>] do_splice_direct+0x98/0xd0
[ 4788.671472] [<ffffffff81281dd1>] do_sendfile+0x1d1/0x3b0
[ 4788.677499] [<ffffffff812829c9>] SyS_sendfile64+0xc9/0xd0
[ 4788.683622] [<ffffffff81003f8c>] do_syscall_64+0x6c/0x1e0
[ 4788.689744] [<ffffffff817d927f>] entry_SYSCALL64_slow_path+0x25/0x25
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