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From: CAI Qian <caiqian@redhat.com>
To: Jan Kara <jack@suse.cz>, Miklos Szeredi <miklos@szeredi.hu>,
	tj <tj@kernel.org>, Al Viro <viro@ZenIV.linux.org.uk>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Dave Chinner <david@fromorbit.com>
Cc: linux-xfs <linux-xfs@vger.kernel.org>,
	Jens Axboe <axboe@kernel.dk>, Nick Piggin <npiggin@gmail.com>,
	linux-fsdevel@vger.kernel.org,
	Dave Jones <davej@codemonkey.org.uk>
Subject: Re: local DoS - systemd hang or timeout (WAS: Re: [RFC][CFT] splice_read reworked)
Date: Fri, 7 Oct 2016 14:56:22 -0400 (EDT)
Message-ID: <1337864351.1107846.1475866582573.JavaMail.zimbra@redhat.com> (raw)
In-Reply-To: <1267347639.1072505.1475854075552.JavaMail.zimbra@redhat.com>



----- Original Message -----
> From: "CAI Qian" <caiqian@redhat.com>
> To: "Jan Kara" <jack@suse.cz>, "Miklos Szeredi" <miklos@szeredi.hu>, "tj" <tj@kernel.org>, "Al Viro"
> <viro@ZenIV.linux.org.uk>, "Linus Torvalds" <torvalds@linux-foundation.org>, "Dave Chinner" <david@fromorbit.com>
> Cc: "linux-xfs" <linux-xfs@vger.kernel.org>, "Jens Axboe" <axboe@kernel.dk>, "Nick Piggin" <npiggin@gmail.com>,
> linux-fsdevel@vger.kernel.org, "Dave Jones" <davej@codemonkey.org.uk>
> Sent: Friday, October 7, 2016 11:27:55 AM
> Subject: Re: local DoS - systemd hang or timeout (WAS: Re: [RFC][CFT] splice_read reworked)
> 
> 
> 
> > Hmm, this round of trinity triggered a different hang.
> This hang is reproducible so far with the command below on a overlayfs/xfs,
Another data point is that this hang can also be reproduced using device-mapper thinp
as the docker backend.
    CAI Qian

[12047.714409] INFO: task trinity-c0:3716 blocked for more than 120 seconds.
[12047.722033]       Not tainted 4.8.0-rc8-splice-fixw-proc+ #4
[12047.728354] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[12047.737107] trinity-c0      D ffff8804507dbd10 13552  3716   3713 0x00000084
[12047.744997]  ffff8804507dbd10 ffff8804240e9368 ffff880400000000 ffffffff81c0d540
[12047.753300]  ffff88044c430000 ffff8804507dc000 ffff8804240e9350 ffff8804507dbd40
[12047.761598]  ffff8804240e9368 ffff8804240e94d8 ffff8804507dbd28 ffffffff817cdaaf
[12047.769898] Call Trace:
[12047.772631]  [<ffffffff817cdaaf>] schedule+0x3f/0xa0
[12047.778174]  [<ffffffff817d24b7>] rwsem_down_read_failed+0x107/0x190
[12047.785303]  [<ffffffffa028ccca>] ? xfs_file_fsync+0xea/0x2e0 [xfs]
[12047.792309]  [<ffffffff813e2788>] call_rwsem_down_read_failed+0x18/0x30
[12047.799695]  [<ffffffff810f8b0b>] down_read_nested+0x5b/0x80
[12047.806029]  [<ffffffffa029d5fa>] ? xfs_ilock+0xfa/0x260 [xfs]
[12047.812554]  [<ffffffffa029d5fa>] xfs_ilock+0xfa/0x260 [xfs]
[12047.818887]  [<ffffffffa028ccca>] xfs_file_fsync+0xea/0x2e0 [xfs]
[12047.825693]  [<ffffffff812bdbbd>] vfs_fsync_range+0x3d/0xb0
[12047.831915]  [<ffffffff812bdc8d>] do_fsync+0x3d/0x70
[12047.837455]  [<ffffffff812bdf63>] SyS_fdatasync+0x13/0x20
[12047.843485]  [<ffffffff81003c9c>] do_syscall_64+0x6c/0x1e0
[12047.849609]  [<ffffffff817d4a3f>] entry_SYSCALL64_slow_path+0x25/0x25
[12047.856801] 1 lock held by trinity-c0/3716:
[12047.861470]  #0:  (&xfs_nondir_ilock_class){++++..}, at: [<ffffffffa029d5fa>] xfs_ilock+0xfa/0x260 [xfs]
[12047.872125] INFO: task trinity-c1:3717 blocked for more than 120 seconds.
[12047.879703]       Not tainted 4.8.0-rc8-splice-fixw-proc+ #4
[12047.886011] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[12047.894749] trinity-c1      D ffff8804507ffd10 13568  3717   3713 0x00000084
[12047.902645]  ffff8804507ffd10 ffff8804240e9368 ffff880400000000 ffff88046c9da000
[12047.910941]  ffff88044c434000 ffff880450800000 ffff8804240e9350 ffff8804507ffd40
[12047.919240]  ffff8804240e9368 ffff8804240e94d8 ffff8804507ffd28 ffffffff817cdaaf
[12047.927542] Call Trace:
[12047.930284]  [<ffffffff817cdaaf>] schedule+0x3f/0xa0
[12047.935826]  [<ffffffff817d24b7>] rwsem_down_read_failed+0x107/0x190
[12047.942933]  [<ffffffffa028ccca>] ? xfs_file_fsync+0xea/0x2e0 [xfs]
[12047.949930]  [<ffffffff813e2788>] call_rwsem_down_read_failed+0x18/0x30
[12047.957315]  [<ffffffff810f8b0b>] down_read_nested+0x5b/0x80
[12047.963647]  [<ffffffffa029d5fa>] ? xfs_ilock+0xfa/0x260 [xfs]
[12047.970171]  [<ffffffffa029d5fa>] xfs_ilock+0xfa/0x260 [xfs]
[12047.976506]  [<ffffffffa028ccca>] xfs_file_fsync+0xea/0x2e0 [xfs]
[12047.983310]  [<ffffffff812bdbbd>] vfs_fsync_range+0x3d/0xb0
[12047.989529]  [<ffffffff812bdc8d>] do_fsync+0x3d/0x70
[12047.995070]  [<ffffffff812bdf63>] SyS_fdatasync+0x13/0x20
[12048.001096]  [<ffffffff81003c9c>] do_syscall_64+0x6c/0x1e0
[12048.007217]  [<ffffffff817d4a3f>] entry_SYSCALL64_slow_path+0x25/0x25
[12048.014407] 1 lock held by trinity-c1/3717:
[12048.019085]  #0:  (&xfs_nondir_ilock_class){++++..}, at: [<ffffffffa029d5fa>] xfs_ilock+0xfa/0x260 [xfs]
[12048.029742] INFO: task trinity-c2:3718 blocked for more than 120 seconds.
[12048.037310]       Not tainted 4.8.0-rc8-splice-fixw-proc+ #4
[12048.043626] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[12048.052365] trinity-c2      D ffff8804586c7df8 13504  3718   3713 0x00000084
[12048.060261]  ffff8804586c7df8 0000000000000006 0000000000000000 ffff88046c9dc000
[12048.068565]  ffff88044c436000 ffff8804586c8000 ffff88044ec7e6f8 ffff88044c436000
[12048.076862]  0000000000000246 00000000ffffffff ffff8804586c7e10 ffffffff817cdaaf
[12048.085163] Call Trace:
[12048.087893]  [<ffffffff817cdaaf>] schedule+0x3f/0xa0
[12048.093434]  [<ffffffff817cdf18>] schedule_preempt_disabled+0x18/0x30
[12048.100627]  [<ffffffff817cf4df>] mutex_lock_nested+0x19f/0x450
[12048.107237]  [<ffffffff812a5313>] ? __fdget_pos+0x43/0x50
[12048.113262]  [<ffffffff812a5313>] __fdget_pos+0x43/0x50
[12048.119094]  [<ffffffff81297f53>] SyS_getdents+0x83/0x140
[12048.125120]  [<ffffffff81297cd0>] ? fillonedir+0x100/0x100
[12048.131243]  [<ffffffff81003c9c>] do_syscall_64+0x6c/0x1e0
[12048.137357]  [<ffffffff817d4a3f>] entry_SYSCALL64_slow_path+0x25/0x25
[12048.144546] 1 lock held by trinity-c2/3718:
[12048.149214]  #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff812a5313>] __fdget_pos+0x43/0x50
[12048.158495] INFO: task trinity-c3:3719 blocked for more than 120 seconds.
[12048.166071]       Not tainted 4.8.0-rc8-splice-fixw-proc+ #4
[12048.172388] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[12048.181120] trinity-c3      D ffff880450707c60 13552  3719   3713 0x00000084
[12048.189013]  ffff880450707c60 ffffffff00000000 ffff880400000000 ffff88046ca10000
[12048.197313]  ffff88044c432000 ffff880450708000 ffff8804240e9658 ffff8804240e9640
[12048.205612]  ffffffff00000000 ffff88044c432000 ffff880450707c78 ffffffff817cdaaf
[12048.213912] Call Trace:
[12048.216643]  [<ffffffff817cdaaf>] schedule+0x3f/0xa0
[12048.222183]  [<ffffffff817d2782>] rwsem_down_write_failed+0x242/0x4b0
[12048.229374]  [<ffffffff817d25ac>] ? rwsem_down_write_failed+0x6c/0x4b0
[12048.236662]  [<ffffffff813e27b7>] call_rwsem_down_write_failed+0x17/0x30
[12048.244144]  [<ffffffff817d1bff>] down_write+0x5f/0x80
[12048.249881]  [<ffffffff812ad021>] ? vfs_removexattr+0x61/0x120
[12048.256391]  [<ffffffff812ad021>] vfs_removexattr+0x61/0x120
[12048.262709]  [<ffffffff812ad135>] removexattr+0x55/0x80
[12048.268533]  [<ffffffff81402ff3>] ? __this_cpu_preempt_check+0x13/0x20
[12048.275811]  [<ffffffff810f8eae>] ? update_fast_ctr+0x4e/0x70
[12048.282225]  [<ffffffff810f8f57>] ? percpu_down_read+0x57/0x90
[12048.288728]  [<ffffffff81284be1>] ? __sb_start_write+0xd1/0xf0
[12048.295230]  [<ffffffff810cc367>] ? preempt_count_add+0x47/0xc0
[12048.301829]  [<ffffffff812a665f>] ? mnt_clone_write+0x3f/0x70
[12048.308242]  [<ffffffff812a8588>] ? __mnt_want_write_file+0x18/0x30
[12048.315238]  [<ffffffff812a85d0>] ? mnt_want_write_file+0x30/0x60
[12048.322039]  [<ffffffff812ae303>] SyS_fremovexattr+0x83/0xb0
[12048.328356]  [<ffffffff81003c9c>] do_syscall_64+0x6c/0x1e0
[12048.334478]  [<ffffffff817d4a3f>] entry_SYSCALL64_slow_path+0x25/0x25
[12048.341679] 2 locks held by trinity-c3/3719:
[12048.346454]  #0:  (sb_writers#8){.+.+.+}, at: [<ffffffff81284be1>] __sb_start_write+0xd1/0xf0
[12048.356042]  #1:  (&sb->s_type->i_mutex_key#14){+.+.+.}, at: [<ffffffff812ad021>] vfs_removexattr+0x61/0x120
[12048.367079] INFO: task trinity-c4:3720 blocked for more than 120 seconds.
[12048.374655]       Not tainted 4.8.0-rc8-splice-fixw-proc+ #4
[12048.380972] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[12048.389712] trinity-c4      D ffff88045072be08 13536  3720   3713 0x00000084
[12048.397606]  ffff88045072be08 0000000000000006 0000000000000000 ffff88046c9fe000
[12048.405902]  ffff880450720000 ffff88045072c000 ffff88044ec7e6f8 ffff880450720000
[12048.414205]  0000000000000246 00000000ffffffff ffff88045072be20 ffffffff817cdaaf
[12048.422505] Call Trace:
[12048.425235]  [<ffffffff817cdaaf>] schedule+0x3f/0xa0
[12048.430767]  [<ffffffff817cdf18>] schedule_preempt_disabled+0x18/0x30
[12048.437957]  [<ffffffff817cf4df>] mutex_lock_nested+0x19f/0x450
[12048.444565]  [<ffffffff812a5313>] ? __fdget_pos+0x43/0x50
[12048.450591]  [<ffffffff8117729f>] ? __audit_syscall_entry+0xaf/0x100
[12048.457675]  [<ffffffff812a5313>] __fdget_pos+0x43/0x50
[12048.463508]  [<ffffffff81298091>] SyS_getdents64+0x81/0x130
[12048.469720]  [<ffffffff81297a80>] ? iterate_dir+0x190/0x190
[12048.475939]  [<ffffffff81003c9c>] do_syscall_64+0x6c/0x1e0
[12048.482063]  [<ffffffff817d4a3f>] entry_SYSCALL64_slow_path+0x25/0x25
[12048.489243] 1 lock held by trinity-c4/3720:
[12048.493913]  #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff812a5313>] __fdget_pos+0x43/0x50
[12048.503182] INFO: task trinity-c5:3721 blocked for more than 120 seconds.
[12048.510757]       Not tainted 4.8.0-rc8-splice-fixw-proc+ #4
[12048.517071] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[12048.525812] trinity-c5      D ffff8804510a7e08 13552  3721   3713 0x00000084
[12048.533706]  ffff8804510a7e08 0000000000000006 0000000000000000 ffff88046c9fa000
[12048.542007]  ffff880450722000 ffff8804510a8000 ffff88044ec7e6f8 ffff880450722000
[12048.550310]  0000000000000246 00000000ffffffff ffff8804510a7e20 ffffffff817cdaaf
[12048.558610] Call Trace:
[12048.561339]  [<ffffffff817cdaaf>] schedule+0x3f/0xa0
[12048.566879]  [<ffffffff817cdf18>] schedule_preempt_disabled+0x18/0x30
[12048.574070]  [<ffffffff817cf4df>] mutex_lock_nested+0x19f/0x450
[12048.580677]  [<ffffffff812a5313>] ? __fdget_pos+0x43/0x50
[12048.586703]  [<ffffffff8117729f>] ? __audit_syscall_entry+0xaf/0x100
[12048.593796]  [<ffffffff812a5313>] __fdget_pos+0x43/0x50
[12048.599629]  [<ffffffff81298091>] SyS_getdents64+0x81/0x130
[12048.605849]  [<ffffffff81297a80>] ? iterate_dir+0x190/0x190
[12048.612069]  [<ffffffff81003c9c>] do_syscall_64+0x6c/0x1e0
[12048.618191]  [<ffffffff817d4a3f>] entry_SYSCALL64_slow_path+0x25/0x25
[12048.625382] 1 lock held by trinity-c5/3721:
[12048.630049]  #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff812a5313>] __fdget_pos+0x43/0x50
[12048.639329] INFO: task trinity-c6:3722 blocked for more than 120 seconds.
[12048.646903]       Not tainted 4.8.0-rc8-splice-fixw-proc+ #4
[12048.653219] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[12048.661958] trinity-c6      D ffff88044f0ebc50 12224  3722   3713 0x00000084
[12048.669849]  ffff88044f0ebc50 ffff8804240e9368 ffff880400000000 ffff88046c9fc000
[12048.678149]  ffff880450724000 ffff88044f0ec000 ffff8804240e9350 ffff88044f0ebc80
[12048.686448]  ffff8804240e9368 ffff8804240e92c0 ffff88044f0ebc68 ffffffff817cdaaf
[12048.694750] Call Trace:
[12048.697478]  [<ffffffff817cdaaf>] schedule+0x3f/0xa0
[12048.703018]  [<ffffffff817d24b7>] rwsem_down_read_failed+0x107/0x190
[12048.710126]  [<ffffffffa029d7d4>] ? xfs_ilock_attr_map_shared+0x34/0x40 [xfs]
[12048.718095]  [<ffffffff813e2788>] call_rwsem_down_read_failed+0x18/0x30
[12048.725479]  [<ffffffff810f8b0b>] down_read_nested+0x5b/0x80
[12048.731800]  [<ffffffffa029d5fa>] ? xfs_ilock+0xfa/0x260 [xfs]
[12048.738337]  [<ffffffffa029d5fa>] xfs_ilock+0xfa/0x260 [xfs]
[12048.744669]  [<ffffffffa029d7d4>] xfs_ilock_attr_map_shared+0x34/0x40 [xfs]
[12048.752457]  [<ffffffffa0280801>] xfs_attr_list_int+0x71/0x690 [xfs]
[12048.759555]  [<ffffffff810cba89>] ? __might_sleep+0x49/0x80
[12048.765792]  [<ffffffffa02abf2a>] xfs_vn_listxattr+0x7a/0xb0 [xfs]
[12048.772707]  [<ffffffffa02abcc0>] ? __xfs_xattr_put_listent+0xa0/0xa0 [xfs]
[12048.780480]  [<ffffffff812ad582>] vfs_listxattr+0x42/0x70
[12048.786517]  [<ffffffff812ad68e>] listxattr+0xde/0xf0
[12048.792156]  [<ffffffff812ae1f6>] SyS_flistxattr+0x56/0xa0
[12048.798271]  [<ffffffff81003c9c>] do_syscall_64+0x6c/0x1e0
[12048.804404]  [<ffffffff817d4a3f>] entry_SYSCALL64_slow_path+0x25/0x25
[12048.811595] 1 lock held by trinity-c6/3722:
[12048.816263]  #0:  (&xfs_nondir_ilock_class){++++..}, at: [<ffffffffa029d5fa>] xfs_ilock+0xfa/0x260 [xfs]
[12048.826935] INFO: task trinity-c7:3723 blocked for more than 120 seconds.
[12048.834516]       Not tainted 4.8.0-rc8-splice-fixw-proc+ #4
[12048.840832] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[12048.849572] trinity-c7      D ffff88044fc23c50 13552  3723   3713 0x00000084
[12048.857469]  ffff88044fc23c50 ffff8804240e9368 ffff880400000000 ffff88046c9f8000
[12048.865768]  ffff880450726000 ffff88044fc24000 ffff8804240e9350 ffff88044fc23c80
[12048.874067]  ffff8804240e9368 ffff8804240e92c0 ffff88044fc23c68 ffffffff817cdaaf
[12048.882370] Call Trace:
[12048.885100]  [<ffffffff817cdaaf>] schedule+0x3f/0xa0
[12048.890634]  [<ffffffff817d24b7>] rwsem_down_read_failed+0x107/0x190
[12048.897741]  [<ffffffffa029d7d4>] ? xfs_ilock_attr_map_shared+0x34/0x40 [xfs]
[12048.905707]  [<ffffffff813e2788>] call_rwsem_down_read_failed+0x18/0x30
[12048.913081]  [<ffffffff810f8b0b>] down_read_nested+0x5b/0x80
[12048.919412]  [<ffffffffa029d5fa>] ? xfs_ilock+0xfa/0x260 [xfs]
[12048.925937]  [<ffffffffa029d5fa>] xfs_ilock+0xfa/0x260 [xfs]
[12048.932267]  [<ffffffffa029d7d4>] xfs_ilock_attr_map_shared+0x34/0x40 [xfs]
[12048.940053]  [<ffffffffa0280801>] xfs_attr_list_int+0x71/0x690 [xfs]
[12048.947146]  [<ffffffff810cba89>] ? __might_sleep+0x49/0x80
[12048.953374]  [<ffffffffa02abf2a>] xfs_vn_listxattr+0x7a/0xb0 [xfs]
[12048.960288]  [<ffffffffa02abcc0>] ? __xfs_xattr_put_listent+0xa0/0xa0 [xfs]
[12048.968060]  [<ffffffff812ad582>] vfs_listxattr+0x42/0x70
[12048.974088]  [<ffffffff812ad602>] listxattr+0x52/0xf0
[12048.979726]  [<ffffffff812ae1f6>] SyS_flistxattr+0x56/0xa0
[12048.985849]  [<ffffffff81003c9c>] do_syscall_64+0x6c/0x1e0
[12048.991973]  [<ffffffff817d4a3f>] entry_SYSCALL64_slow_path+0x25/0x25
[12048.999162] 1 lock held by trinity-c7/3723:
[12049.003831]  #0:  (&xfs_nondir_ilock_class){++++..}, at: [<ffffffffa029d5fa>] xfs_ilock+0xfa/0x260 [xfs]
[12049.014481] INFO: task trinity-c8:3724 blocked for more than 120 seconds.
[12049.022072]       Not tainted 4.8.0-rc8-splice-fixw-proc+ #4
[12049.028389] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[12049.037130] trinity-c8      D ffff88044fc3fc60 13504  3724   3713 0x00000084
[12049.045023]  ffff88044fc3fc60 ffffffff00000000 ffff880400000000 ffff88046ca14000
[12049.053324]  ffff88044e540000 ffff88044fc40000 ffff8804240e9368 ffff8804240e9350
[12049.061623]  ffffffff00000000 ffff88044e540000 ffff88044fc3fc78 ffffffff817cdaaf
[12049.069924] Call Trace:
[12049.072654]  [<ffffffff817cdaaf>] schedule+0x3f/0xa0
[12049.078208]  [<ffffffff817d2782>] rwsem_down_write_failed+0x242/0x4b0
[12049.085408]  [<ffffffff817d25ac>] ? rwsem_down_write_failed+0x6c/0x4b0
[12049.092734]  [<ffffffffa028d7cc>] ? xfs_update_prealloc_flags+0x6c/0x100 [xfs]
[12049.100798]  [<ffffffff813e27b7>] call_rwsem_down_write_failed+0x17/0x30
[12049.108290]  [<ffffffff810f8c15>] down_write_nested+0x65/0x80
[12049.114742]  [<ffffffffa029d68e>] ? xfs_ilock+0x18e/0x260 [xfs]
[12049.121377]  [<ffffffffa029d68e>] xfs_ilock+0x18e/0x260 [xfs]
[12049.127819]  [<ffffffffa028d7cc>] xfs_update_prealloc_flags+0x6c/0x100 [xfs]
[12049.135714]  [<ffffffffa028da8e>] xfs_file_fallocate+0x22e/0x360 [xfs]
[12049.143004]  [<ffffffff810f8eae>] ? update_fast_ctr+0x4e/0x70
[12049.149435]  [<ffffffff810f8f57>] ? percpu_down_read+0x57/0x90
[12049.155958]  [<ffffffff81284be1>] ? __sb_start_write+0xd1/0xf0
[12049.162492]  [<ffffffff81284be1>] ? __sb_start_write+0xd1/0xf0
[12049.169016]  [<ffffffff8127e000>] vfs_fallocate+0x140/0x230
[12049.175249]  [<ffffffff8127eee4>] SyS_fallocate+0x44/0x70
[12049.181288]  [<ffffffff81003c9c>] do_syscall_64+0x6c/0x1e0
[12049.187423]  [<ffffffff817d4a3f>] entry_SYSCALL64_slow_path+0x25/0x25
[12049.194667] 5 locks held by trinity-c8/3724:
[12049.199429]  #0:  (sb_writers#8){.+.+.+}, at: [<ffffffff81284be1>] __sb_start_write+0xd1/0xf0
[12049.209024]  #1:  (&(&ip->i_iolock)->mr_lock){++++++}, at: [<ffffffffa029d654>] xfs_ilock+0x154/0x260 [xfs]
[12049.219990]  #2:  (&(&ip->i_mmaplock)->mr_lock){+++++.}, at: [<ffffffffa029d674>] xfs_ilock+0x174/0x260 [xfs]
[12049.231128]  #3:  (sb_internal){.+.+.+}, at: [<ffffffff81284b8b>] __sb_start_write+0x7b/0xf0
[12049.240620]  #4:  (&xfs_nondir_ilock_class){++++..}, at: [<ffffffffa029d68e>] xfs_ilock+0x18e/0x260 [xfs]
[12049.251383] INFO: task trinity-c9:3725 blocked for more than 120 seconds.
[12049.258959]       Not tainted 4.8.0-rc8-splice-fixw-proc+ #4
[12049.265287] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[12049.274027] trinity-c9      D ffff88044f043d30 13552  3725   3713 0x00000084
[12049.281922]  ffff88044f043d30 ffffffff00000000 ffff880400000000 ffff88046ca14000
[12049.290238]  ffff88044e542000 ffff88044f044000 ffff8804240e9658 ffff8804240e9640
[12049.298539]  ffffffff00000000 ffff88044e542000 ffff88044f043d48 ffffffff817cdaaf
[12049.306840] Call Trace:
[12049.309569]  [<ffffffff817cdaaf>] schedule+0x3f/0xa0
[12049.315122]  [<ffffffff817d2782>] rwsem_down_write_failed+0x242/0x4b0
[12049.322327]  [<ffffffff817d25ac>] ? rwsem_down_write_failed+0x6c/0x4b0
[12049.329625]  [<ffffffff813e27b7>] call_rwsem_down_write_failed+0x17/0x30
[12049.337118]  [<ffffffff817d1bff>] down_write+0x5f/0x80
[12049.342864]  [<ffffffff8127e413>] ? chmod_common+0x63/0x150
[12049.349096]  [<ffffffff8127e413>] chmod_common+0x63/0x150
[12049.355131]  [<ffffffff8117729f>] ? __audit_syscall_entry+0xaf/0x100
[12049.362236]  [<ffffffff810035cc>] ? syscall_trace_enter+0x1dc/0x390
[12049.369243]  [<ffffffff8127f5f2>] SyS_fchmod+0x52/0x80
[12049.374988]  [<ffffffff81003c9c>] do_syscall_64+0x6c/0x1e0
[12049.381124]  [<ffffffff817d4a3f>] entry_SYSCALL64_slow_path+0x25/0x25
[12049.388324] 2 locks held by trinity-c9/3725:
[12049.393100]  #0:  (sb_writers#8){.+.+.+}, at: [<ffffffff81284be1>] __sb_start_write+0xd1/0xf0
[12049.402705]  #1:  (&sb->s_type->i_mutex_key#14){+.+.+.}, at: [<ffffffff8127e413>] chmod_common+0x63/0x150

  reply index

Thread overview: 101+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20160908235521.GL2356@ZenIV.linux.org.uk>
     [not found] ` <20160909015324.GD30056@dastard>
     [not found]   ` <CA+55aFzohsUXj_3BeFNr2t50Wm=G+7toRDEz=Tk7VJqP3n1hXQ@mail.gmail.com>
     [not found]     ` <CA+55aFxrqCng2Qxasc9pyMrKUGFjo==fEaFT1vkH9Lncte3RgQ@mail.gmail.com>
     [not found]       ` <20160909023452.GO2356@ZenIV.linux.org.uk>
     [not found]         ` <CA+55aFwHQMjO4-vtfB9-ytc=o+DRo-HXVGckvXLboUxgpwb7_g@mail.gmail.com>
     [not found]           ` <20160909221945.GQ2356@ZenIV.linux.org.uk>
     [not found]             ` <CA+55aFzTOOB6oEVaaGD0N7Uznk-W9+ULPwzsxS_L_oZqGVSeLA@mail.gmail.com>
     [not found]               ` <20160914031648.GB2356@ZenIV.linux.org.uk>
     [not found]                 ` <20160914133925.2fba4629@roar.ozlabs.ibm.com>
2016-09-18  5:33                   ` xfs_file_splice_read: possible circular locking dependency detected Al Viro
2016-09-19  3:08                     ` Nicholas Piggin
2016-09-19  6:11                       ` Al Viro
2016-09-19  7:26                         ` Nicholas Piggin
     [not found]                 ` <CA+55aFznQaOWoSMNphgGJJWZ=8-odrc0DAUMzfGPQe+_N4UgNA@mail.gmail.com>
     [not found]                   ` <20160914042559.GC2356@ZenIV.linux.org.uk>
     [not found]                     ` <20160917082007.GA6489@ZenIV.linux.org.uk>
     [not found]                       ` <20160917190023.GA8039@ZenIV.linux.org.uk>
2016-09-18 19:31                         ` skb_splice_bits() and large chunks in pipe (was " Al Viro
2016-09-18 20:12                           ` Linus Torvalds
2016-09-18 22:31                             ` Al Viro
2016-09-19  0:18                               ` Linus Torvalds
2016-09-23 19:00                         ` [RFC][CFT] splice_read reworked Al Viro
2016-09-23 19:01                           ` [PATCH 01/11] fix memory leaks in tracing_buffers_splice_read() Al Viro
2016-09-23 19:02                           ` [PATCH 02/11] splice_to_pipe(): don't open-code wakeup_pipe_readers() Al Viro
2016-09-23 19:02                           ` [PATCH 03/11] splice: switch get_iovec_page_array() to iov_iter Al Viro
2016-09-23 19:03                           ` [PATCH 04/11] splice: lift pipe_lock out of splice_to_pipe() Al Viro
2016-09-23 19:45                             ` Linus Torvalds
2016-09-23 20:10                               ` Al Viro
2016-09-23 20:36                                 ` Linus Torvalds
2016-09-24  3:59                                   ` Al Viro
2016-09-24 17:29                                     ` Al Viro
2016-09-27 15:38                                       ` Nicholas Piggin
2016-09-27 15:53                                       ` Chuck Lever
2016-09-24  3:59                                   ` [PATCH 04/12] " Al Viro
2016-09-26 13:35                                     ` Miklos Szeredi
2016-09-27  4:14                                       ` Al Viro
2016-12-17 19:54                                     ` Andreas Schwab
2016-12-18 19:28                                       ` Linus Torvalds
2016-12-18 19:57                                         ` Andreas Schwab
2016-12-18 20:12                                         ` Al Viro
2016-12-18 20:30                                           ` Al Viro
2016-12-18 22:10                                             ` Linus Torvalds
2016-12-18 22:18                                               ` Al Viro
2016-12-18 22:22                                                 ` Linus Torvalds
2016-12-18 22:49                                               ` Andreas Schwab
2016-12-21 18:56                                               ` Andreas Schwab
2016-12-21 19:12                                                 ` Linus Torvalds
2016-09-24  4:00                                   ` [PATCH 06/12] new helper: add_to_pipe() Al Viro
2016-09-26 13:49                                     ` Miklos Szeredi
2016-09-24  4:01                                   ` [PATCH 10/12] new iov_iter flavour: pipe-backed Al Viro
2016-09-29 20:53                                     ` Miklos Szeredi
2016-09-29 22:50                                       ` Al Viro
2016-09-30  7:30                                         ` Miklos Szeredi
2016-10-03  3:34                                           ` [RFC] O_DIRECT vs EFAULT (was Re: [PATCH 10/12] new iov_iter flavour: pipe-backed) Al Viro
2016-10-03 17:07                                             ` Linus Torvalds
2016-10-03 18:54                                               ` Al Viro
2016-09-24  4:01                                   ` [PATCH 11/12] switch generic_file_splice_read() to use of ->read_iter() Al Viro
2016-09-24  4:02                                   ` [PATCH 12/12] switch default_file_splice_read() to use of pipe-backed iov_iter Al Viro
2016-09-23 19:03                           ` [PATCH 05/11] skb_splice_bits(): get rid of callback Al Viro
2016-09-23 19:04                           ` [PATCH 06/11] new helper: add_to_pipe() Al Viro
2016-09-23 19:04                           ` [PATCH 07/11] fuse_dev_splice_read(): switch to add_to_pipe() Al Viro
2016-09-23 19:06                           ` [PATCH 08/11] cifs: don't use memcpy() to copy struct iov_iter Al Viro
2016-09-23 19:08                           ` [PATCH 09/11] fuse_ioctl_copy_user(): don't open-code copy_page_{to,from}_iter() Al Viro
2016-09-26  9:31                             ` Miklos Szeredi
2016-09-23 19:09                           ` [PATCH 10/11] new iov_iter flavour: pipe-backed Al Viro
2016-09-23 19:10                           ` [PATCH 11/11] switch generic_file_splice_read() to use of ->read_iter() Al Viro
2016-09-30 13:32                           ` [RFC][CFT] splice_read reworked CAI Qian
2016-09-30 17:42                             ` CAI Qian
2016-09-30 18:33                               ` CAI Qian
2016-10-03  1:37                                 ` Al Viro
2016-10-03 17:49                                   ` CAI Qian
2016-10-04 17:39                                     ` local DoS - systemd hang or timeout (WAS: Re: [RFC][CFT] splice_read reworked) CAI Qian
2016-10-04 21:42                                       ` tj
2016-10-05 14:09                                         ` CAI Qian
2016-10-05 15:30                                           ` tj
2016-10-05 15:54                                             ` CAI Qian
2016-10-05 18:57                                               ` CAI Qian
2016-10-05 20:05                                                 ` Al Viro
2016-10-06 12:20                                                   ` CAI Qian
2016-10-06 12:25                                                     ` CAI Qian
2016-10-06 16:11                                                       ` CAI Qian
2016-10-06 17:00                                                         ` Linus Torvalds
2016-10-06 18:12                                                           ` CAI Qian
2016-10-07  9:57                                                           ` Dave Chinner
2016-10-07 15:25                                                             ` Linus Torvalds
2016-10-07  7:08                                                       ` Jan Kara
2016-10-07 14:43                                                         ` CAI Qian
2016-10-07 15:27                                                           ` CAI Qian
2016-10-07 18:56                                                             ` CAI Qian [this message]
2016-10-09 21:54                                                               ` Dave Chinner
2016-10-10 14:10                                                                 ` CAI Qian
2016-10-10 20:14                                                                   ` CAI Qian
2016-10-10 21:57                                                                   ` Dave Chinner
2016-10-12 19:50                                                                     ` [bisected] " CAI Qian
2016-10-12 20:59                                                                       ` Dave Chinner
2016-10-13 16:25                                                                         ` CAI Qian
2016-10-13 20:49                                                                           ` Dave Chinner
2016-10-13 20:56                                                                             ` CAI Qian
2016-10-09 21:51                                                           ` Dave Chinner
2016-10-21 15:38                                                         ` [4.9-rc1+] overlayfs lockdep CAI Qian
2016-10-24 12:57                                                           ` Miklos Szeredi
2016-10-07  9:27                                                     ` local DoS - systemd hang or timeout (WAS: Re: [RFC][CFT] splice_read reworked) Dave Chinner
2016-10-03  1:42                               ` [RFC][CFT] splice_read reworked Al Viro
2016-10-03 14:06                                 ` CAI Qian
2016-10-03 15:20                                   ` CAI Qian
2016-10-03 21:12                                     ` Dave Chinner
2016-10-04 13:57                                       ` CAI Qian
2016-10-03 20:32                                   ` CAI Qian
2016-10-03 20:35                                     ` Al Viro
2016-10-04 13:29                                       ` CAI Qian
2016-10-04 14:28                                         ` Al Viro
2016-10-04 16:21                                           ` CAI Qian
2016-10-04 20:12                                             ` Al Viro
2016-10-05 14:30                                               ` CAI Qian
2016-10-05 16:07                                                 ` Al Viro
2016-09-19  0:22 skb_splice_bits() and large chunks in pipe (was Re: xfs_file_splice_read: possible circular locking dependency detected Al Viro
2016-09-20  9:51 ` Herbert Xu

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