I think the warning just indicate a possible bug:
nfs_inode_set_delegation():
clp->cl_lock
--> inode->i_lock
get_lock_alloc_layout():
nfsi->lo_lock
--> clp->cl_lock
nfs_try_to_update_request()->pnfs_do_flush()->_pnfs_do_flush()->
pnfs_find_get_lseg()->get_lock_current_layout():
inode->i_lock
-->nfsi->lo_lock
In nfs_inode_set_delegation(), maybe we should unlock clp->cl_lock before
taking inode->i_lock spinlock?
PS: I just use the latest pnfsblock code(pnfs-all-2.6.34-2010-05-17) doing some
basic r/w tests and it works fine. Can you find out which code path
lead to IO errror?
On Wed, May 19, 2010 at 12:20 AM, J. Bruce Fields <bfields@xxxxxxxxxxxx> wrote:
> On Tue, May 18, 2010 at 01:22:52AM +0800, Zhang Jingwang wrote:
>> I've sent two patches to solve this problem, you can try them.
>>
>> [PATCH] pnfs: set pnfs_curr_ld before calling initialize_mountpoint
>> [PATCH] pnfs: set pnfs_blksize before calling set_pnfs_layoutdriver
>
> Thanks. With Benny's latest block all (97602fc6, which includes the two
> patches above), I'm back to the previous behavior:
>
>>
>> 2010/5/18 J. Bruce Fields <bfields@xxxxxxxxxxxx>:
>> > On Mon, May 17, 2010 at 10:53:11AM -0400, J. Bruce Fields wrote:
>> >> On Mon, May 17, 2010 at 05:24:39PM +0300, Boaz Harrosh wrote:
>> >> > On 05/17/2010 04:53 PM, J. Bruce Fields wrote:
>> >> > > On Wed, May 12, 2010 at 04:28:12PM -0400, bfields wrote:
>> >> > >> The one thing I've noticed is that the connectathon general test has
>> >> > >> started failing right at the start with an IO error. The last good
>> >> > >> version I tested was b5c09c21, which was based on 33-rc6. The earliest
>> >> > >> bad version I tested was 419312ada, based on 34-rc2. A quick look at
>> >> > >> network traces from the two traces didn't turn up anything obvious. I
>> >> > >> haven't had the chance yet to look closer.
>
> So I still see the IO error at the start of the connectathon general
> tests.
>
> Also, I get the following warning--I don't know if it's new or not.
>
> --b.
>
> =======================================================
> [ INFO: possible circular locking dependency detected ]
> 2.6.34-pnfs-00322-g97602fc #141
> -------------------------------------------------------
> cp/2789 is trying to acquire lock:
> (&(&nfsi->lo_lock)->rlock){+.+...}, at: [<ffffffff8124dbee>] T.947+0x4e/0x210
>
> but task is already holding lock:
> (&sb->s_type->i_lock_key#11){+.+...}, at: [<ffffffff81223689>] nfs_updatepage+0x139/0x5a0
>
> which lock already depends on the new lock.
>
>
> the existing dependency chain (in reverse order) is:
>
> -> #2 (&sb->s_type->i_lock_key#11){+.+...}:
> [<ffffffff81065913>] __lock_acquire+0x1293/0x1d30
> [<ffffffff81066442>] lock_acquire+0x92/0x170
> [<ffffffff81925d5b>] _raw_spin_lock+0x3b/0x50
> [<ffffffff81244173>] nfs_inode_set_delegation+0x203/0x2c0
> [<ffffffff81231b7a>] nfs4_opendata_to_nfs4_state+0x31a/0x3d0
> [<ffffffff81231fb2>] nfs4_do_open+0x242/0x460
> [<ffffffff81232a05>] nfs4_proc_create+0x85/0x220
> [<ffffffff8120ec64>] nfs_create+0x74/0x120
> [<ffffffff810e5d63>] vfs_create+0xb3/0x100
> [<ffffffff810e656b>] do_last+0x59b/0x6c0
> [<ffffffff810e88e2>] do_filp_open+0x212/0x690
> [<ffffffff810d8059>] do_sys_open+0x69/0x140
> [<ffffffff810d8170>] sys_open+0x20/0x30
> [<ffffffff81002518>] system_call_fastpath+0x16/0x1b
>
> -> #1 (&(&clp->cl_lock)->rlock){+.+...}:
> [<ffffffff81065913>] __lock_acquire+0x1293/0x1d30
> [<ffffffff81066442>] lock_acquire+0x92/0x170
> [<ffffffff81925d5b>] _raw_spin_lock+0x3b/0x50
> [<ffffffff8124b378>] pnfs_update_layout+0x2f8/0xaf0
> [<ffffffff8124c7e4>] pnfs_file_write+0x64/0xc0
> [<ffffffff810daab7>] vfs_write+0xb7/0x180
> [<ffffffff810dac71>] sys_write+0x51/0x90
> [<ffffffff81002518>] system_call_fastpath+0x16/0x1b
>
> -> #0 (&(&nfsi->lo_lock)->rlock){+.+...}:
> [<ffffffff81065dd2>] __lock_acquire+0x1752/0x1d30
> [<ffffffff81066442>] lock_acquire+0x92/0x170
> [<ffffffff81925d5b>] _raw_spin_lock+0x3b/0x50
> [<ffffffff8124dbee>] T.947+0x4e/0x210
> [<ffffffff8124ddfb>] _pnfs_do_flush+0x4b/0xf0
> [<ffffffff8122364d>] nfs_updatepage+0xfd/0x5a0
> [<ffffffff812126b5>] nfs_write_end+0x265/0x3e0
> [<ffffffff810a3397>] generic_file_buffered_write+0x187/0x2a0
> [<ffffffff810a5890>] __generic_file_aio_write+0x240/0x460
> [<ffffffff810a5b17>] generic_file_aio_write+0x67/0xd0
> [<ffffffff81213661>] nfs_file_write+0xb1/0x1f0
> [<ffffffff810d9fca>] do_sync_write+0xda/0x120
> [<ffffffff8124c802>] pnfs_file_write+0x82/0xc0
> [<ffffffff810daab7>] vfs_write+0xb7/0x180
> [<ffffffff810dac71>] sys_write+0x51/0x90
> [<ffffffff81002518>] system_call_fastpath+0x16/0x1b
>
> other info that might help us debug this:
>
> 2 locks held by cp/2789:
> #0: (&sb->s_type->i_mutex_key#13){+.+.+.}, at: [<ffffffff810a5b04>] generic_file_aio_write+0x54/0xd0
> #1: (&sb->s_type->i_lock_key#11){+.+...}, at: [<ffffffff81223689>] nfs_updatepage+0x139/0x5a0
>
> stack backtrace:
> Pid: 2789, comm: cp Not tainted 2.6.34-pnfs-00322-g97602fc #141
> Call Trace:
> [<ffffffff81064033>] print_circular_bug+0xf3/0x100
> [<ffffffff81065dd2>] __lock_acquire+0x1752/0x1d30
> [<ffffffff81066442>] lock_acquire+0x92/0x170
> [<ffffffff8124dbee>] ? T.947+0x4e/0x210
> [<ffffffff81929d59>] ? sub_preempt_count+0x9/0xa0
> [<ffffffff81925d5b>] _raw_spin_lock+0x3b/0x50
> [<ffffffff8124dbee>] ? T.947+0x4e/0x210
> [<ffffffff8124dbee>] T.947+0x4e/0x210
> [<ffffffff8124ddfb>] _pnfs_do_flush+0x4b/0xf0
> [<ffffffff8122364d>] nfs_updatepage+0xfd/0x5a0
> [<ffffffff812126b5>] nfs_write_end+0x265/0x3e0
> [<ffffffff810a3397>] generic_file_buffered_write+0x187/0x2a0
> [<ffffffff810a5890>] __generic_file_aio_write+0x240/0x460
> [<ffffffff81929d59>] ? sub_preempt_count+0x9/0xa0
> [<ffffffff810a5b17>] generic_file_aio_write+0x67/0xd0
> [<ffffffff81213661>] nfs_file_write+0xb1/0x1f0
> [<ffffffff810d9fca>] do_sync_write+0xda/0x120
> [<ffffffff810528a0>] ? autoremove_wake_function+0x0/0x40
> [<ffffffff8124c802>] pnfs_file_write+0x82/0xc0
> [<ffffffff810daab7>] vfs_write+0xb7/0x180
> [<ffffffff810dac71>] sys_write+0x51/0x90
> [<ffffffff81002518>] system_call_fastpath+0x16/0x1b
> eth0: no IPv6 routers present
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--
tao.
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