On Fri, Oct 07, 2016 at 10:43:18AM -0400, CAI Qian wrote:
> Hmm, this round of trinity triggered a different hang.
>
> [ 2094.487964] [<ffffffff813e27b7>] call_rwsem_down_write_failed+0x17/0x30
> [ 2094.495450] [<ffffffff817d1bff>] down_write+0x5f/0x80
> [ 2094.508284] [<ffffffff8127e301>] chown_common.isra.12+0x131/0x1e0
> [ 2094.553784] 2 locks held by trinity-c0/3126:
> [ 2094.558552] #0: (sb_writers#14){.+.+.+}, at: [<ffffffff81284be1>] __sb_start_write+0xd1/0xf0
> [ 2094.568240] #1: (&sb->s_type->i_mutex_key#17){++++++}, at: [<ffffffff8127e301>] chown_common.isra.12+0x131/0x1e0
Waiting on i_mutex.
> [ 2094.643597] [<ffffffff817d24b7>] rwsem_down_read_failed+0x107/0x190
> [ 2094.665119] [<ffffffff810f8b0b>] down_read_nested+0x5b/0x80
> [ 2094.691133] [<ffffffff812bdbbd>] vfs_fsync_range+0x3d/0xb0
> [ 2094.721844] 1 lock held by trinity-c1/3127:
> [ 2094.726515] #0: (&xfs_nondir_ilock_class){++++..}, at: [<ffffffffa03335fa>] xfs_ilock+0xfa/0x260 [xfs]
Waiting on i_ilock.
> [ 2094.808078] [<ffffffff817cf4df>] mutex_lock_nested+0x19f/0x450
> [ 2094.820715] [<ffffffff812a5313>] __fdget_pos+0x43/0x50
> [ 2094.826544] [<ffffffff81297f53>] SyS_getdents+0x83/0x140
> [ 2094.856682] #0: (&f->f_pos_lock){+.+.+.}, at: [<ffffffff812a5313>] __fdget_pos+0x43/0x50
concurrent readdir on the same directory fd, blocked on fd.
> [ 2094.936885] [<ffffffff817cf4df>] mutex_lock_nested+0x19f/0x450
> [ 2094.956620] [<ffffffff812a5313>] __fdget_pos+0x43/0x50
> [ 2094.962454] [<ffffffff81298091>] SyS_getdents64+0x81/0x130
> [ 2094.988204] 1 lock held by trinity-c3/3129:
> [ 2094.992872] #0: (&f->f_pos_lock){+.+.+.}, at: [<ffffffff812a5313>] __fdget_pos+0x43/0x50
Same.
> [ 2095.073118] [<ffffffff817cf4df>] mutex_lock_nested+0x19f/0x450
> [ 2095.091589] [<ffffffff812811dd>] SyS_lseek+0x1d/0xb0
> [ 2095.097229] [<ffffffff81003c9c>] do_syscall_64+0x6c/0x1e0
> [ 2095.110547] 1 lock held by trinity-c4/3130:
> [ 2095.115216] #0: (&f->f_pos_lock){+.+.+.}, at: [<ffffffff812a5313>] __fdget_pos+0x43/0x50
Concurrent lseek on directory fd, blocked on fd.
> [ 2095.188230] [<ffffffff817d24b7>] rwsem_down_read_failed+0x107/0x190
> [ 2095.223558] [<ffffffffa03335fa>] xfs_ilock+0xfa/0x260 [xfs]
> [ 2095.229894] [<ffffffffa03337d4>] xfs_ilock_attr_map_shared+0x34/0x40 [xfs]
> [ 2095.237682] [<ffffffffa02ccfaf>] xfs_attr_get+0xdf/0x1b0 [xfs]
> [ 2095.244312] [<ffffffffa0341bfc>] xfs_xattr_get+0x4c/0x70 [xfs]
> [ 2095.250924] [<ffffffff812ad269>] generic_getxattr+0x59/0x70
> [ 2095.257244] [<ffffffff812acf9b>] vfs_getxattr+0x8b/0xb0
> [ 2095.263177] [<ffffffffa0435bd6>] ovl_xattr_get+0x46/0x60 [overlay]
> [ 2095.270176] [<ffffffffa04331aa>] ovl_other_xattr_get+0x1a/0x20 [overlay]
> [ 2095.277756] [<ffffffff812ad269>] generic_getxattr+0x59/0x70
> [ 2095.284079] [<ffffffff81345e9e>] cap_inode_need_killpriv+0x2e/0x40
> [ 2095.291078] [<ffffffff81349a33>] security_inode_need_killpriv+0x33/0x50
> [ 2095.298560] [<ffffffff812a2fb0>] dentry_needs_remove_privs+0x30/0x50
> [ 2095.305743] [<ffffffff8127ea21>] do_truncate+0x51/0xc0
> [ 2095.311581] [<ffffffff81284be1>] ? __sb_start_write+0xd1/0xf0
> [ 2095.318094] [<ffffffff81284be1>] ? __sb_start_write+0xd1/0xf0
> [ 2095.324609] [<ffffffff8127edde>] do_sys_ftruncate.constprop.15+0xfe/0x160
> [ 2095.332286] [<ffffffff8127ee7e>] SyS_ftruncate+0xe/0x10
> [ 2095.338225] [<ffffffff81003c9c>] do_syscall_64+0x6c/0x1e0
> [ 2095.344339] [<ffffffff817d4a3f>] entry_SYSCALL64_slow_path+0x25/0x25
> [ 2095.351531] 2 locks held by trinity-c5/3131:
> [ 2095.356297] #0: (sb_writers#14){.+.+.+}, at: [<ffffffff81284be1>] __sb_start_write+0xd1/0xf0
> [ 2095.365983] #1: (&xfs_nondir_ilock_class){++++..}, at: [<ffffffffa03335fa>] xfs_ilock+0xfa/0x260 [xfs]
truncate on overlay, removing xattrs from XFS file, blocked on
i_ilock.
> [ 2095.440372] [<ffffffff817d2782>] rwsem_down_write_failed+0x242/0x4b0
> [ 2095.474300] [<ffffffff8127e413>] chmod_common+0x63/0x150
> [ 2095.513452] 2 locks held by trinity-c6/3132:
> [ 2095.518217] #0: (sb_writers#14){.+.+.+}, at: [<ffffffff81284be1>] __sb_start_write+0xd1/0xf0
> [ 2095.527895] #1: (&sb->s_type->i_mutex_key#17){++++++}, at: [<ffffffff8127e413>] chmod_common+0x63/0x150
chmod, blocked on i_mutex.
> [ 2095.602379] [<ffffffff817d24b7>] rwsem_down_read_failed+0x107/0x190
> [ 2095.616490] [<ffffffff813e2788>] call_rwsem_down_read_failed+0x18/0x30
> [ 2095.623877] [<ffffffff810f8b0b>] down_read_nested+0x5b/0x80
> [ 2095.649889] [<ffffffff812bdbbd>] vfs_fsync_range+0x3d/0xb0
> [ 2095.680610] 1 lock held by trinity-c7/3133:
> [ 2095.685281] #0: (&xfs_nondir_ilock_class){++++..}, at: [<ffffffffa03335fa>] xfs_ilock+0xfa/0x260 [xfs]
fsync on file, blocked on i_ilock.
> [ 2095.759662] [<ffffffff817d24b7>] rwsem_down_read_failed+0x107/0x190
> [ 2095.807155] [<ffffffff812bdbbd>] vfs_fsync_range+0x3d/0xb0
> [ 2095.813377] [<ffffffff812bdc8d>] do_fsync+0x3d/0x70
> [ 2095.818921] [<ffffffff812bdf63>] SyS_fdatasync+0x13/0x20
> [ 2095.838261] 1 lock held by trinity-c8/3135:
> [ 2095.842930] #0: (&xfs_nondir_ilock_class){++++..}, at: [<ffffffffa03335fa>] xfs_ilock+0xfa/0x260 [xfs]
ditto.
> [ 2095.917305] [<ffffffff817d24b7>] rwsem_down_read_failed+0x107/0x190
> [ 2095.958968] [<ffffffffa0333790>] xfs_ilock_data_map_shared+0x30/0x40 [xfs]
> [ 2095.966752] [<ffffffffa03128c6>] __xfs_get_blocks+0x96/0x9d0 [xfs]
> [ 2095.989413] [<ffffffffa0313214>] xfs_get_blocks+0x14/0x20 [xfs]
> [ 2095.996122] [<ffffffff812cca44>] do_mpage_readpage+0x474/0x800
> [ 2096.029678] [<ffffffff812ccf0d>] mpage_readpages+0x13d/0x1b0
> [ 2096.050724] [<ffffffffa0311f14>] xfs_vm_readpages+0x54/0x170 [xfs]
> [ 2096.057724] [<ffffffff811f1a1d>] __do_page_cache_readahead+0x2ad/0x370
> [ 2096.079787] [<ffffffff811f2014>] force_page_cache_readahead+0x94/0xf0
> [ 2096.087077] [<ffffffff811f2168>] SyS_readahead+0xa8/0xc0
> [ 2096.106427] 1 lock held by trinity-c9/3136:
> [ 2096.111097] #0: (&xfs_nondir_ilock_class){++++..}, at: [<ffffffffa03335fa>] xfs_ilock+0xfa/0x260 [xfs]
readhead blocking in i_ilock before reading in extents.
Nothing here indicates a deadlock. Everything is waiting for locks,
but nothing is holding locks in a way that indicates that progress
is not being made. This sort of thing can happen when slow storage
is massively overloaded - sysrq-w is really the only way to get a
better picutre of what is happening here, but so far there's no
concrete evidence of a hang from this output.
Cheers,
Dave.
--
Dave Chinner
david@xxxxxxxxxxxxx
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