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Date: Fri, 23 Jul 2010 21:13:10 +1000
From: Dave Chinner <david@...morbit.com>
To: Nick Piggin <npiggin@...nel.dk>
Cc: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-mm@...ck.org, Frank Mayhar <fmayhar@...gle.com>,
John Stultz <johnstul@...ibm.com>
Subject: Re: VFS scalability git tree
On Fri, Jul 23, 2010 at 05:01:00AM +1000, Nick Piggin wrote:
> I'm pleased to announce I have a git tree up of my vfs scalability work.
>
> git://git.kernel.org/pub/scm/linux/kernel/git/npiggin/linux-npiggin.git
> http://git.kernel.org/?p=linux/kernel/git/npiggin/linux-npiggin.git
>
> Branch vfs-scale-working
I've got a couple of patches needed to build XFS - they shrinker
merge left some bad fragments - I'll post them in a minute. This
email is for the longest ever lockdep warning I've seen that
occurred on boot.
Cheers,
Dave.
[ 6.368707] ======================================================
[ 6.369773] [ INFO: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected ]
[ 6.370379] 2.6.35-rc5-dgc+ #58
[ 6.370882] ------------------------------------------------------
[ 6.371475] pmcd/2124 [HC0[0]:SC0[1]:HE1:SE0] is trying to acquire:
[ 6.372062] (&sb->s_type->i_lock_key#6){+.+...}, at: [<ffffffff81736f8c>] socket_get_id+0x3c/0x60
[ 6.372268]
[ 6.372268] and this task is already holding:
[ 6.372268] (&(&hashinfo->ehash_locks[i])->rlock){+.-...}, at: [<ffffffff81791750>] established_get_first+0x60/0x120
[ 6.372268] which would create a new lock dependency:
[ 6.372268] (&(&hashinfo->ehash_locks[i])->rlock){+.-...} -> (&sb->s_type->i_lock_key#6){+.+...}
[ 6.372268]
[ 6.372268] but this new dependency connects a SOFTIRQ-irq-safe lock:
[ 6.372268] (&(&hashinfo->ehash_locks[i])->rlock){+.-...}
[ 6.372268] ... which became SOFTIRQ-irq-safe at:
[ 6.372268] [<ffffffff810b3b26>] __lock_acquire+0x576/0x1450
[ 6.372268] [<ffffffff810b4aa6>] lock_acquire+0xa6/0x160
[ 6.372268] [<ffffffff8182bb26>] _raw_spin_lock+0x36/0x70
[ 6.372268] [<ffffffff8177a1ba>] __inet_hash_nolisten+0xfa/0x180
[ 6.372268] [<ffffffff8179392a>] tcp_v4_syn_recv_sock+0x1aa/0x2d0
[ 6.372268] [<ffffffff81795502>] tcp_check_req+0x202/0x440
[ 6.372268] [<ffffffff817948c4>] tcp_v4_do_rcv+0x304/0x4f0
[ 6.372268] [<ffffffff81795134>] tcp_v4_rcv+0x684/0x7e0
[ 6.372268] [<ffffffff81771512>] ip_local_deliver+0xe2/0x1c0
[ 6.372268] [<ffffffff81771af7>] ip_rcv+0x397/0x760
[ 6.372268] [<ffffffff8174d067>] __netif_receive_skb+0x277/0x330
[ 6.372268] [<ffffffff8174d1f4>] process_backlog+0xd4/0x1e0
[ 6.372268] [<ffffffff8174dc38>] net_rx_action+0x188/0x2b0
[ 6.372268] [<ffffffff81084cc2>] __do_softirq+0xd2/0x260
[ 6.372268] [<ffffffff81035edc>] call_softirq+0x1c/0x50
[ 6.372268] [<ffffffff8108551b>] local_bh_enable_ip+0xeb/0xf0
[ 6.372268] [<ffffffff8182c544>] _raw_spin_unlock_bh+0x34/0x40
[ 6.372268] [<ffffffff8173c59e>] release_sock+0x14e/0x1a0
[ 6.372268] [<ffffffff817a3975>] inet_stream_connect+0x75/0x320
[ 6.372268] [<ffffffff81737917>] sys_connect+0xa7/0xc0
[ 6.372268] [<ffffffff81034ff2>] system_call_fastpath+0x16/0x1b
[ 6.372268]
[ 6.372268] to a SOFTIRQ-irq-unsafe lock:
[ 6.372268] (&sb->s_type->i_lock_key#6){+.+...}
[ 6.372268] ... which became SOFTIRQ-irq-unsafe at:
[ 6.372268] ... [<ffffffff810b3b73>] __lock_acquire+0x5c3/0x1450
[ 6.372268] [<ffffffff810b4aa6>] lock_acquire+0xa6/0x160
[ 6.372268] [<ffffffff8182bb26>] _raw_spin_lock+0x36/0x70
[ 6.372268] [<ffffffff8116af72>] new_inode+0x52/0xd0
[ 6.372268] [<ffffffff81174a40>] get_sb_pseudo+0xb0/0x180
[ 6.372268] [<ffffffff81735a41>] sockfs_get_sb+0x21/0x30
[ 6.372268] [<ffffffff81152dba>] vfs_kern_mount+0x8a/0x1e0
[ 6.372268] [<ffffffff81152f29>] kern_mount_data+0x19/0x20
[ 6.372268] [<ffffffff81e1c075>] sock_init+0x4e/0x59
[ 6.372268] [<ffffffff810001dc>] do_one_initcall+0x3c/0x1a0
[ 6.372268] [<ffffffff81de5767>] kernel_init+0x17a/0x204
[ 6.372268] [<ffffffff81035de4>] kernel_thread_helper+0x4/0x10
[ 6.372268]
[ 6.372268] other info that might help us debug this:
[ 6.372268]
[ 6.372268] 3 locks held by pmcd/2124:
[ 6.372268] #0: (&p->lock){+.+.+.}, at: [<ffffffff81171dae>] seq_read+0x3e/0x430
[ 6.372268] #1: (&(&hashinfo->ehash_locks[i])->rlock){+.-...}, at: [<ffffffff81791750>] established_get_first+0x60/0x120
[ 6.372268] #2: (clock-AF_INET){++....}, at: [<ffffffff8173b6ae>] sock_i_ino+0x2e/0x70
[ 6.372268]
[ 6.372268] the dependencies between SOFTIRQ-irq-safe lock and the holding lock:
[ 6.372268] -> (&(&hashinfo->ehash_locks[i])->rlock){+.-...} ops: 3 {
[ 6.372268] HARDIRQ-ON-W at:
[ 6.372268] [<ffffffff810b3b47>] __lock_acquire+0x597/0x1450
[ 6.372268] [<ffffffff810b4aa6>] lock_acquire+0xa6/0x160
[ 6.372268] [<ffffffff8182bb26>] _raw_spin_lock+0x36/0x70
[ 6.372268] [<ffffffff8177a1ba>] __inet_hash_nolisten+0xfa/0x180
[ 6.372268] [<ffffffff8177ab6a>] __inet_hash_connect+0x33a/0x3d0
[ 6.372268] [<ffffffff8177ac4f>] inet_hash_connect+0x4f/0x60
[ 6.372268] [<ffffffff81792522>] tcp_v4_connect+0x272/0x4f0
[ 6.372268] [<ffffffff817a3b8e>] inet_stream_connect+0x28e/0x320
[ 6.372268] [<ffffffff81737917>] sys_connect+0xa7/0xc0
[ 6.372268] [<ffffffff81034ff2>] system_call_fastpath+0x16/0x1b
[ 6.372268] IN-SOFTIRQ-W at:
[ 6.372268] [<ffffffff810b3b26>] __lock_acquire+0x576/0x1450
[ 6.372268] [<ffffffff810b4aa6>] lock_acquire+0xa6/0x160
[ 6.372268] [<ffffffff8182bb26>] _raw_spin_lock+0x36/0x70
[ 6.372268] [<ffffffff8177a1ba>] __inet_hash_nolisten+0xfa/0x180
[ 6.372268] [<ffffffff8179392a>] tcp_v4_syn_recv_sock+0x1aa/0x2d0
[ 6.372268] [<ffffffff81795502>] tcp_check_req+0x202/0x440
[ 6.372268] [<ffffffff817948c4>] tcp_v4_do_rcv+0x304/0x4f0
[ 6.372268] [<ffffffff81795134>] tcp_v4_rcv+0x684/0x7e0
[ 6.372268] [<ffffffff81771512>] ip_local_deliver+0xe2/0x1c0
[ 6.372268] [<ffffffff81771af7>] ip_rcv+0x397/0x760
[ 6.372268] [<ffffffff8174d067>] __netif_receive_skb+0x277/0x330
[ 6.372268] [<ffffffff8174d1f4>] process_backlog+0xd4/0x1e0
[ 6.372268] [<ffffffff8174dc38>] net_rx_action+0x188/0x2b0
[ 6.372268] [<ffffffff81084cc2>] __do_softirq+0xd2/0x260
[ 6.372268] [<ffffffff81035edc>] call_softirq+0x1c/0x50
[ 6.372268] [<ffffffff8108551b>] local_bh_enable_ip+0xeb/0xf0
[ 6.372268] [<ffffffff8182c544>] _raw_spin_unlock_bh+0x34/0x40
[ 6.372268] [<ffffffff8173c59e>] release_sock+0x14e/0x1a0
[ 6.372268] [<ffffffff817a3975>] inet_stream_connect+0x75/0x320
[ 6.372268] [<ffffffff81737917>] sys_connect+0xa7/0xc0
[ 6.372268] [<ffffffff81034ff2>] system_call_fastpath+0x16/0x1b
[ 6.372268] INITIAL USE at:
[ 6.372268] [<ffffffff810b37e2>] __lock_acquire+0x232/0x1450
[ 6.372268] [<ffffffff810b4aa6>] lock_acquire+0xa6/0x160
[ 6.372268] [<ffffffff8182bb26>] _raw_spin_lock+0x36/0x70
[ 6.372268] [<ffffffff8177a1ba>] __inet_hash_nolisten+0xfa/0x180
[ 6.372268] [<ffffffff8177ab6a>] __inet_hash_connect+0x33a/0x3d0
[ 6.372268] [<ffffffff8177ac4f>] inet_hash_connect+0x4f/0x60
[ 6.372268] [<ffffffff81792522>] tcp_v4_connect+0x272/0x4f0
[ 6.372268] [<ffffffff817a3b8e>] inet_stream_connect+0x28e/0x320
[ 6.372268] [<ffffffff81737917>] sys_connect+0xa7/0xc0
[ 6.372268] [<ffffffff81034ff2>] system_call_fastpath+0x16/0x1b
[ 6.372268] }
[ 6.372268] ... key at: [<ffffffff8285ddf8>] __key.47027+0x0/0x8
[ 6.372268] ... acquired at:
[ 6.372268] [<ffffffff810b2940>] check_irq_usage+0x60/0xf0
[ 6.372268] [<ffffffff810b41ff>] __lock_acquire+0xc4f/0x1450
[ 6.372268] [<ffffffff810b4aa6>] lock_acquire+0xa6/0x160
[ 6.372268] [<ffffffff8182bb26>] _raw_spin_lock+0x36/0x70
[ 6.372268] [<ffffffff81736f8c>] socket_get_id+0x3c/0x60
[ 6.372268] [<ffffffff8173b6c3>] sock_i_ino+0x43/0x70
[ 6.372268] [<ffffffff81790fc9>] tcp4_seq_show+0x1a9/0x520
[ 6.372268] [<ffffffff81172005>] seq_read+0x295/0x430
[ 6.372268] [<ffffffff811ad9f4>] proc_reg_read+0x84/0xc0
[ 6.372268] [<ffffffff81150165>] vfs_read+0xb5/0x170
[ 6.372268] [<ffffffff81150274>] sys_read+0x54/0x90
[ 6.372268] [<ffffffff81034ff2>] system_call_fastpath+0x16/0x1b
[ 6.372268]
[ 6.372268]
[ 6.372268] the dependencies between the lock to be acquired and SOFTIRQ-irq-unsafe lock:
[ 6.372268] -> (&sb->s_type->i_lock_key#6){+.+...} ops: 1185 {
[ 6.372268] HARDIRQ-ON-W at:
[ 6.372268] [<ffffffff810b3b47>] __lock_acquire+0x597/0x1450
[ 6.372268] [<ffffffff810b4aa6>] lock_acquire+0xa6/0x160
[ 6.372268] [<ffffffff8182bb26>] _raw_spin_lock+0x36/0x70
[ 6.372268] [<ffffffff8116af72>] new_inode+0x52/0xd0
[ 6.372268] [<ffffffff81174a40>] get_sb_pseudo+0xb0/0x180
[ 6.372268] [<ffffffff81735a41>] sockfs_get_sb+0x21/0x30
[ 6.372268] [<ffffffff81152dba>] vfs_kern_mount+0x8a/0x1e0
[ 6.372268] [<ffffffff81152f29>] kern_mount_data+0x19/0x20
[ 6.372268] [<ffffffff81e1c075>] sock_init+0x4e/0x59
[ 6.372268] [<ffffffff810001dc>] do_one_initcall+0x3c/0x1a0
[ 6.372268] [<ffffffff81de5767>] kernel_init+0x17a/0x204
[ 6.372268] [<ffffffff81035de4>] kernel_thread_helper+0x4/0x10
[ 6.372268] SOFTIRQ-ON-W at:
[ 6.372268] [<ffffffff810b3b73>] __lock_acquire+0x5c3/0x1450
[ 6.372268] [<ffffffff810b4aa6>] lock_acquire+0xa6/0x160
[ 6.372268] [<ffffffff8182bb26>] _raw_spin_lock+0x36/0x70
[ 6.372268] [<ffffffff8116af72>] new_inode+0x52/0xd0
[ 6.372268] [<ffffffff81174a40>] get_sb_pseudo+0xb0/0x180
[ 6.372268] [<ffffffff81735a41>] sockfs_get_sb+0x21/0x30
[ 6.372268] [<ffffffff81152dba>] vfs_kern_mount+0x8a/0x1e0
[ 6.372268] [<ffffffff81152f29>] kern_mount_data+0x19/0x20
[ 6.372268] [<ffffffff81e1c075>] sock_init+0x4e/0x59
[ 6.372268] [<ffffffff810001dc>] do_one_initcall+0x3c/0x1a0
[ 6.372268] [<ffffffff81de5767>] kernel_init+0x17a/0x204
[ 6.372268] [<ffffffff81035de4>] kernel_thread_helper+0x4/0x10
[ 6.372268] INITIAL USE at:
[ 6.372268] [<ffffffff810b37e2>] __lock_acquire+0x232/0x1450
[ 6.372268] [<ffffffff810b4aa6>] lock_acquire+0xa6/0x160
[ 6.372268] [<ffffffff8182bb26>] _raw_spin_lock+0x36/0x70
[ 6.372268] [<ffffffff8116af72>] new_inode+0x52/0xd0
[ 6.372268] [<ffffffff81174a40>] get_sb_pseudo+0xb0/0x180
[ 6.372268] [<f [<ffffffff81152dba>] vfs_kern_mount+0x8a/0x1e0
[ 6.372268] [<ffffffff81152f29>] kern_mount_data+0x19/0x20
[ 6.372268] [<ffffffff81e1c075>] sock_init+0x4e/0x59
[ 6.372268] [<ffffffff810001dc>] do_one_initcall+0x3c/0x1a0
[ 6.372268] [<ffffffff81de5767>] kernel_init+0x17a/0x204
[ 6.372268] [<ffffffff81035de4>] kernel_thread_helper+0x4/0x10
[ 6.372268] }
[ 6.372268] ... key at: [<ffffffff81bd5bd8>] sock_fs_type+0x58/0x80
[ 6.372268] ... acquired at:
[ 6.372268] [<ffffffff810b2940>] check_irq_usage+0x60/0xf0
[ 6.372268] [<ffffffff810b41ff>] __lock_acquire+0xc4f/0x1450
[ 6.372268] [<ffffffff810b4aa6>] lock_acquire+0xa6/0x160
[ 6.372268] [<ffffffff8182bb26>] _raw_spin_lock+0x36/0x70
[ 6.372268] [<ffffffff81736f8c>] socket_get_id+0x3c/0x60
[ 6.372268] [<ffffffff8173b6c3>] sock_i_ino+0x43/0x70
[ 6.372268] [<ffffffff81790fc9>] tcp4_seq_show+0x1a9/0x520
[ 6.372268] [<ffffffff81172005>] seq_read+0x295/0x430
[ 6.372268] [<ffffffff811ad9f4>] proc_reg_read+0x84/0xc0
[ 6.372268] [<ffffffff81150165>] vfs_read+0xb5/0x170
[ 6.372268] [<ffffffff81150274>] sys_read+0x54/0x90
[ 6.372268] [<ffffffff81034ff2>] system_call_fastpath+0x16/0x1b
[ 6.372268]
[ 6.372268]
[ 6.372268] stack backtrace:
[ 6.372268] Pid: 2124, comm: pmcd Not tainted 2.6.35-rc5-dgc+ #58
[ 6.372268] Call Trace:
[ 6.372268] [<ffffffff810b28d9>] check_usage+0x499/0x4a0
[ 6.372268] [<ffffffff810b24c6>] ? check_usage+0x86/0x4a0
[ 6.372268] [<ffffffff810af729>] ? __bfs+0x129/0x260
[ 6.372268] [<ffffffff810b2940>] check_irq_usage+0x60/0xf0
[ 6.372268] [<ffffffff810b41ff>] __lock_acquire+0xc4f/0x1450
[ 6.372268] [<ffffffff810b4aa6>] lock_acquire+0xa6/0x160
[ 6.372268] [<ffffffff81736f8c>] ? socket_get_id+0x3c/0x60
[ 6.372268] [<ffffffff8182bb26>] _raw_spin_lock+0x36/0x70
[ 6.372268] [<ffffffff81736f8c>] ? socket_get_id+0x3c/0x60
[ 6.372268] [<ffffffff81736f8c>] socket_get_id+0x3c/0x60
[ 6.372268] [<ffffffff8173b6c3>] sock_i_ino+0x43/0x70
[ 6.372268] [<ffffffff81790fc9>] tcp4_seq_show+0x1a9/0x520
[ 6.372268] [<ffffffff81791750>] ? established_get_first+0x60/0x120
[ 6.372268] [<ffffffff8182beb7>] ? _raw_spin_lock_bh+0x67/0x70
[ 6.372268] [<ffffffff81172005>] seq_read+0x295/0x430
[ 6.372268] [<ffffffff81171d70>] ? seq_read+0x0/0x430
[ 6.372268] [<ffffffff811ad9f4>] proc_reg_read+0x84/0xc0
[ 6.372268] [<ffffffff81150165>] vfs_read+0xb5/0x170
[ 6.372268] [<ffffffff81150274>] sys_read+0x54/0x90
[ 6.372268] [<ffffffff81034ff2>] system_call_fastpath+0x16/0x1b
--
Dave Chinner
david@...morbit.com
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