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lockdep warning when logging in with ssh

To: xfs@xxxxxxxxxxx, Eric Sandeen <esandeen@xxxxxxxxxx>
Subject: lockdep warning when logging in with ssh
From: Prarit Bhargava <prarit@xxxxxxxxxx>
Date: Wed, 10 Sep 2014 14:59:31 -0400
Delivered-to: xfs@xxxxxxxxxxx
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20131028 Thunderbird/17.0.10
I see this when I attempt to login via ssh.  I do not see it if I login on
the serial console.  I recall seeing it earlier when chasing another patch but
cannot recall the kernel version.


[  201.054547] ======================================================
[  201.082819] [ INFO: possible circular locking dependency detected ]
[  201.112071] 3.17.0-rc4+ #1 Not tainted
[  201.129705] -------------------------------------------------------
[  201.158238] sshd/8554 is trying to acquire lock:
[  201.179054]  (&isec->lock){+.+.+.}, at: [<ffffffff812fc885>]
inode_doinit_with_dentry+0xc5/0x670
[  201.219847]
[  201.219847] but task is already holding lock:
[  201.247255]  (&mm->mmap_sem){++++++}, at: [<ffffffff811d32bf>]
vm_mmap_pgoff+0x8f/0xf0
[  201.283640]
[  201.283640] which lock already depends on the new lock.
[  201.283640]
[  201.321218]
[  201.321218] the existing dependency chain (in reverse order) is:
[  201.356331]
-> #2 (&mm->mmap_sem){++++++}:
[  201.377731]        [<ffffffff810e0d70>] __lock_acquire+0x380/0xb50
[  201.406027]        [<ffffffff810e1d19>] lock_acquire+0x99/0x1d0
[  201.432867]        [<ffffffff811e2cbc>] might_fault+0x8c/0xb0
[  201.458823]        [<ffffffff81251361>] filldir+0x91/0x120
[  201.483514]        [<ffffffffa01b8d7e>]
xfs_dir2_block_getdents.isra.12+0x1be/0x220 [xfs]
[  201.521199]        [<ffffffffa01b8fe4>] xfs_readdir+0x1a4/0x2a0 [xfs]
[  201.550249]        [<ffffffffa01bb79b>] xfs_file_readdir+0x2b/0x30 [xfs]
[  201.581293]        [<ffffffff8125114e>] iterate_dir+0xae/0x140
[  201.607964]        [<ffffffff8125166d>] SyS_getdents+0x9d/0x130
[  201.635824]        [<ffffffff81725b69>] system_call_fastpath+0x16/0x1b
[  201.665367]
-> #1 (&xfs_dir_ilock_class){++++.+}:
[  201.687368]        [<ffffffff810e0d70>] __lock_acquire+0x380/0xb50
[  201.716063]        [<ffffffff810e1d19>] lock_acquire+0x99/0x1d0
[  201.743603]        [<ffffffff810da997>] down_read_nested+0x57/0xa0
[  201.771960]        [<ffffffffa01ca662>] xfs_ilock+0x122/0x250 [xfs]
[  201.800555]        [<ffffffffa01ca804>] xfs_ilock_attr_map_shared+0x34/0x40 
[xfs]
[  201.834681]        [<ffffffffa016a4f0>] xfs_attr_get+0xc0/0x1b0 [xfs]
[  201.864877]        [<ffffffffa01dafbd>] xfs_xattr_get+0x3d/0x80 [xfs]
[  201.895005]        [<ffffffff81265f7f>] generic_getxattr+0x4f/0x70
[  201.923173]        [<ffffffff812fc932>] inode_doinit_with_dentry+0x172/0x670
[  201.955329]        [<ffffffff812fcf08>] sb_finish_set_opts+0xd8/0x270
[  201.984446]        [<ffffffff812fd36d>] selinux_set_mnt_opts+0x2cd/0x630
[  202.015726]        [<ffffffff812fd747>] superblock_doinit+0x77/0xf0
[  202.044073]        [<ffffffff812fd7d0>] delayed_superblock_init+0x10/0x20
[  202.074967]        [<ffffffff8123f372>] iterate_supers+0xb2/0x110
[  202.103173]        [<ffffffff812fefe3>] selinux_complete_init+0x33/0x40
[  202.133771]        [<ffffffff8130eea3>] security_load_policy+0x103/0x620
[  202.164131]        [<ffffffff81300d4b>] sel_write_load+0xbb/0x780
[  202.191891]        [<ffffffff8123b64a>] vfs_write+0xba/0x1f0
[  202.217918]        [<ffffffff8123c298>] SyS_write+0x58/0xd0
[  202.243473]        [<ffffffff81725b69>] system_call_fastpath+0x16/0x1b
[  202.273205]
-> #0 (&isec->lock){+.+.+.}:
[  202.292818]        [<ffffffff810dff29>] validate_chain.isra.43+0x10d9/0x1170
[  202.324616]        [<ffffffff810e0d70>] __lock_acquire+0x380/0xb50
[  202.352176]        [<ffffffff810e1d19>] lock_acquire+0x99/0x1d0
[  202.379637]        [<ffffffff817209e8>] mutex_lock_nested+0x88/0x520
[  202.408647]        [<ffffffff812fc885>] inode_doinit_with_dentry+0xc5/0x670
[  202.440389]        [<ffffffff812fda7c>] selinux_d_instantiate+0x1c/0x20
[  202.470704]        [<ffffffff812f138b>] security_d_instantiate+0x1b/0x30
[  202.501868]        [<ffffffff812555f0>] d_instantiate+0x50/0x70
[  202.528664]        [<ffffffff811cef9f>] __shmem_file_setup+0xef/0x1f0
[  202.557658]        [<ffffffff811d2c88>] shmem_zero_setup+0x28/0x70
[  202.585826]        [<ffffffff811ee402>] mmap_region+0x522/0x610
[  202.613190]        [<ffffffff811ee7f1>] do_mmap_pgoff+0x301/0x3d0
[  202.641687]        [<ffffffff811d32e0>] vm_mmap_pgoff+0xb0/0xf0
[  202.668753]        [<ffffffff811ecce6>] SyS_mmap_pgoff+0x116/0x290
[  202.697026]        [<ffffffff810211a2>] SyS_mmap+0x22/0x30
[  202.722424]        [<ffffffff81725b69>] system_call_fastpath+0x16/0x1b
[  202.751931]
[  202.751931] other info that might help us debug this:
[  202.751931]
[  202.788578] Chain exists of:
  &isec->lock --> &xfs_dir_ilock_class --> &mm->mmap_sem

[  202.824995]  Possible unsafe locking scenario:
[  202.824995]
[  202.851334]        CPU0                    CPU1
[  202.872186]        ----                    ----
[  202.892929]   lock(&mm->mmap_sem);
[  202.908542]                                lock(&xfs_dir_ilock_class);
[  202.938063]                                lock(&mm->mmap_sem);
[  202.964735]   lock(&isec->lock);
[  202.979226]
[  202.979226]  *** DEADLOCK ***
[  202.979226]
[  203.006150] 1 lock held by sshd/8554:
[  203.023836]  #0:  (&mm->mmap_sem){++++++}, at: [<ffffffff811d32bf>]
vm_mmap_pgoff+0x8f/0xf0
[  203.062439]
[  203.062439] stack backtrace:
[  203.082082] CPU: 1 PID: 8554 Comm: sshd Not tainted 3.17.0-rc4+ #1
[  203.110336] Hardware name: HP ProLiant MicroServer Gen8, BIOS J06 08/24/2013
[  203.143994]  0000000000000 00000000d8562903 ffff88006c333a58 ffffffff8171b358
[  203.671383]  ffffffff82accf70 ffff88006c333a98 ffffffff8171444a 
ffff88006c333ad0
[  203.705097]  ffff88003507b718 ffff88003507b718 0000000000000000 
ffff88003507aa10
[  203.738777] Call Trace:
[  203.749696]  [<ffffffff8171b358>] dump_stack+0x4d/0x66
[  203.774113]  [<ffffffff8171444a>] print_circular_bug+0x1f9/0x207
[  203.801532]  [<ffffffff810dff29>] validate_chain.isra.43+0x10d9/0x1170
[  203.831325]  [<ffffffff810e0d70>] __lock_acquire+0x380/0xb50
[  203.857340]  [<ffffffff810e1d19>] lock_acquire+0x99/0x1d0
[  203.882653]  [<ffffffff812fc885>] ? inode_doinit_with_dentry+0xc5/0x670
[  203.913148]  [<ffffffff817209e8>] mutex_lock_nested+0x88/0x520
[  203.939761]  [<ffffffff812fc885>] ? inode_doinit_with_dentry+0xc5/0x670
[  203.969908]  [<ffffffff812fc885>] ? inode_doinit_with_dentry+0xc5/0x670
[  203.999854]  [<ffffffff810252c5>] ? native_sched_clock+0x35/0xa0
[  204.029374]  [<ffffffff81025339>] ? sched_clock+0x9/0x10
[  204.053170]  [<ffffffff812fc885>] inode_doinit_with_dentry+0xc5/0x670
[  204.181571]  [<ffffffff810dc67f>] ? lock_release_holdtime.part.28+0xf/0x190
[  204.213464]  [<ffffffff812fda7c>] selinux_d_instantiate+0x1c/0x20
[  204.241190]  [<ffffffff812f138b>] security_d_instantiate+0x1b/0x30
[  204.269524]  [<ffffffff812555f0>] d_instantiate+0x50/0x70
[  204.293826]  [<ffffffff811cef9f>] __shmem_file_setup+0xef/0x1f0
[  204.320845]  [<ffffffff811d2c88>] shmem_zero_setup+0x28/0x70
[  204.346843]  [<ffffffff811ee402>] mmap_region+0x522/0x610
[  204.371943]  [<ffffffff811ee7f1>] do_mmap_pgoff+0x301/0x3d0
[  204.398095]  [<ffffffff811d32e0>] vm_mmap_pgoff+0xb0/0xf0
[  204.422903]  [<ffffffff811ecce6>] SyS_mmap_pgoff+0x116/0x290
[  204.448487]  [<ffffffff810e05cd>] ? trace_hardirqs_on+0xd/0x10
[  204.475204]  [<ffffffff810211a2>] SyS_mmap+0x22/0x30
[  204.498005]  [<ffffffff81725b69>] system_call_fastpath+0x16/0x1b
[  204.526495] [sched_delayed] sched: RT throttling activated

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