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Date: Sat, 21 Jun 2008 16:57:38 +0400
From: "Alexander Beregalov" <a.beregalov@...il.com>
To: kernel-testers@...r.kernel.org,
"kernel list" <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
"Mel Gorman" <mel@....ul.ie>,
"Christoph Lameter" <clameter@....com>,
"Lee Schermerhorn" <lee.schermerhorn@...com>,
"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>,
"Hugh Dickins" <hugh@...itas.com>,
"Nick Piggin" <nickpiggin@...oo.com.au>,
"Andrew Morton" <akpm@...ux-foundation.org>,
"Linus Torvalds" <torvalds@...ux-foundation.org>,
bfields@...ldses.org, neilb@...e.de, linux-nfs@...r.kernel.org
Subject: Re: 2.6.26-rc: nfsd hangs for a few sec
One more try, added some CC's.
2008/6/12 Alexander Beregalov <a.beregalov@...il.com>:
> I have bisected it and it seems introduced here:
> How could it be?
>
> 54a6eb5c4765aa573a030ceeba2c14e3d2ea5706 is first bad commit
> commit 54a6eb5c4765aa573a030ceeba2c14e3d2ea5706
> Author: Mel Gorman <mel@....ul.ie>
> Date: Mon Apr 28 02:12:16 2008 -0700
>
> mm: use two zonelist that are filtered by GFP mask
>
> Currently a node has two sets of zonelists, one for each zone type in the
> system and a second set for GFP_THISNODE allocations. Based on the zones
> allowed by a gfp mask, one of these zonelists is selected. All of these
> zonelists consume memory and occupy cache lines.
>
> This patch replaces the multiple zonelists per-node with two zonelists. The
> first contains all populated zones in the system, ordered by distance, for
> fallback allocations when the target/preferred node has no free pages. The
> second contains all populated zones in the node suitable for GFP_THISNODE
> allocations.
>
> An iterator macro is introduced called for_each_zone_zonelist()
> that interates
> through each zone allowed by the GFP flags in the selected zonelist.
>
> Signed-off-by: Mel Gorman <mel@....ul.ie>
> Acked-by: Christoph Lameter <clameter@....com>
> Signed-off-by: Lee Schermerhorn <lee.schermerhorn@...com>
> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> Cc: Mel Gorman <mel@....ul.ie>
> Cc: Christoph Lameter <clameter@....com>
> Cc: Hugh Dickins <hugh@...itas.com>
> Cc: Nick Piggin <nickpiggin@...oo.com.au>
> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
>
> :040000 040000 89cdad93d855fa839537454113f2716011ca0e26
> 57aa307f4bddd264e70c759a2fb2076bfde363eb M arch
> :040000 040000 4add802178c0088a85d3738b42ec42ca33e07d60
> 126d3b170424a18b60074a7901c4e9b98f3bdee5 M fs
> :040000 040000 9d215d6248382dab53003d230643f0169f3e3e84
> 67d196d890a27d2211b3bf7e833e6366addba739 M include
> :040000 040000 6502d185e8ea6338953027c29cc3ab960d6f9bad
> c818e0fc538cdc40016e2d5fe33661c9c54dc8a5 M mm
>
> I remind the log message (it still happens on -rc5):
> Machine hangs for few seconds.
> I can caught such thing during the first hour of running.
>
> [ INFO: possible circular locking dependency detected ]
> 2.6.26-rc5-00084-g39b945a #3
> -------------------------------------------------------
> nfsd/3457 is trying to acquire lock:
> (iprune_mutex){--..}, at: [<c016fb6c>] shrink_icache_memory+0x38/0x19b
>
> but task is already holding lock:
> (&(&ip->i_iolock)->mr_lock){----}, at: [<c021108f>] xfs_ilock+0xa2/0xd6
>
> which lock already depends on the new lock.
>
>
> the existing dependency chain (in reverse order) is:
>
> -> #1 (&(&ip->i_iolock)->mr_lock){----}:
> [<c0135416>] __lock_acquire+0xa0c/0xbc6
> [<c013563a>] lock_acquire+0x6a/0x86
> [<c012c4f2>] down_write_nested+0x33/0x6a
> [<c0211068>] xfs_ilock+0x7b/0xd6
> [<c02111e1>] xfs_ireclaim+0x1d/0x59
> [<c022f342>] xfs_finish_reclaim+0x173/0x195
> [<c0231496>] xfs_reclaim+0xb3/0x138
> [<c023ba0f>] xfs_fs_clear_inode+0x55/0x8e
> [<c016f830>] clear_inode+0x83/0xd2
> [<c016faaf>] dispose_list+0x3c/0xc1
> [<c016fca7>] shrink_icache_memory+0x173/0x19b
> [<c014a7fa>] shrink_slab+0xda/0x153
> [<c014aa53>] try_to_free_pages+0x1e0/0x2a1
> [<c0146ad7>] __alloc_pages_internal+0x23f/0x3a7
> [<c0146c56>] __alloc_pages+0xa/0xc
> [<c015b8c2>] __slab_alloc+0x1c7/0x513
> [<c015beef>] kmem_cache_alloc+0x45/0xb3
> [<c01a5afe>] reiserfs_alloc_inode+0x12/0x23
> [<c016f308>] alloc_inode+0x14/0x1a9
> [<c016f5ed>] iget5_locked+0x47/0x133
> [<c019dffd>] reiserfs_iget+0x29/0x7d
> [<c019b655>] reiserfs_lookup+0xb1/0xee
> [<c01657c2>] do_lookup+0xa9/0x146
> [<c0166deb>] __link_path_walk+0x734/0xb2f
> [<c016722f>] path_walk+0x49/0x96
> [<c01674e0>] do_path_lookup+0x12f/0x149
> [<c0167d08>] __user_walk_fd+0x2f/0x48
> [<c0162157>] vfs_lstat_fd+0x16/0x3d
> [<c01621e9>] vfs_lstat+0x11/0x13
> [<c01621ff>] sys_lstat64+0x14/0x28
> [<c0102bb9>] sysenter_past_esp+0x6a/0xb1
> [<ffffffff>] 0xffffffff
>
> -> #0 (iprune_mutex){--..}:
> [<c0135333>] __lock_acquire+0x929/0xbc6
> [<c013563a>] lock_acquire+0x6a/0x86
> [<c037db3e>] mutex_lock_nested+0xba/0x232
> [<c016fb6c>] shrink_icache_memory+0x38/0x19b
> [<c014a7fa>] shrink_slab+0xda/0x153
> [<c014aa53>] try_to_free_pages+0x1e0/0x2a1
> [<c0146ad7>] __alloc_pages_internal+0x23f/0x3a7
> [<c0146c56>] __alloc_pages+0xa/0xc
> [<c01484f2>] __do_page_cache_readahead+0xaa/0x16a
> [<c01487ac>] ondemand_readahead+0x119/0x127
> [<c014880c>] page_cache_async_readahead+0x52/0x5d
> [<c0179410>] generic_file_splice_read+0x290/0x4a8
> [<c023a46a>] xfs_splice_read+0x4b/0x78
> [<c0237c78>] xfs_file_splice_read+0x24/0x29
> [<c0178712>] do_splice_to+0x45/0x63
> [<c017899e>] splice_direct_to_actor+0xc3/0x190
> [<c01ceddd>] nfsd_vfs_read+0x1ed/0x2d0
> [<c01cf24c>] nfsd_read+0x82/0x99
> [<c01d47b8>] nfsd3_proc_read+0xdf/0x12a
> [<c01cb907>] nfsd_dispatch+0xcf/0x19e
> [<c036356c>] svc_process+0x3b3/0x68b
> [<c01cbe35>] nfsd+0x168/0x26b
> [<c01037db>] kernel_thread_helper+0x7/0x10
> [<ffffffff>] 0xffffffff
>
> other info that might help us debug this:
>
> 3 locks held by nfsd/3457:
> #0: (hash_sem){..--}, at: [<c01d1a34>] exp_readlock+0xd/0xf
> #1: (&(&ip->i_iolock)->mr_lock){----}, at: [<c021108f>] xfs_ilock+0xa2/0xd6
> #2: (shrinker_rwsem){----}, at: [<c014a744>] shrink_slab+0x24/0x153
>
> stack backtrace:
> Pid: 3457, comm: nfsd Not tainted 2.6.26-rc5-00084-g39b945a #3
> [<c01335c8>] print_circular_bug_tail+0x5a/0x65
> [<c0133ec9>] ? print_circular_bug_header+0xa8/0xb3
> [<c0135333>] __lock_acquire+0x929/0xbc6
> [<c013563a>] lock_acquire+0x6a/0x86
> [<c016fb6c>] ? shrink_icache_memory+0x38/0x19b
> [<c037db3e>] mutex_lock_nested+0xba/0x232
> [<c016fb6c>] ? shrink_icache_memory+0x38/0x19b
> [<c016fb6c>] ? shrink_icache_memory+0x38/0x19b
> [<c016fb6c>] shrink_icache_memory+0x38/0x19b
> [<c014a7fa>] shrink_slab+0xda/0x153
> [<c014aa53>] try_to_free_pages+0x1e0/0x2a1
> [<c0149993>] ? isolate_pages_global+0x0/0x3e
> [<c0146ad7>] __alloc_pages_internal+0x23f/0x3a7
> [<c0146c56>] __alloc_pages+0xa/0xc
> [<c01484f2>] __do_page_cache_readahead+0xaa/0x16a
> [<c01487ac>] ondemand_readahead+0x119/0x127
> [<c014880c>] page_cache_async_readahead+0x52/0x5d
> [<c0179410>] generic_file_splice_read+0x290/0x4a8
> [<c037f425>] ? _spin_unlock+0x27/0x3c
> [<c025140d>] ? _atomic_dec_and_lock+0x25/0x30
> [<c01355b4>] ? __lock_acquire+0xbaa/0xbc6
> [<c01787d5>] ? spd_release_page+0x0/0xf
> [<c023a46a>] xfs_splice_read+0x4b/0x78
> [<c0237c78>] xfs_file_splice_read+0x24/0x29
> [<c0178712>] do_splice_to+0x45/0x63
> [<c017899e>] splice_direct_to_actor+0xc3/0x190
> [<c01ceec0>] ? nfsd_direct_splice_actor+0x0/0xf
> [<c01ceddd>] nfsd_vfs_read+0x1ed/0x2d0
> [<c01cf24c>] nfsd_read+0x82/0x99
> [<c01d47b8>] nfsd3_proc_read+0xdf/0x12a
> [<c01cb907>] nfsd_dispatch+0xcf/0x19e
> [<c036356c>] svc_process+0x3b3/0x68b
> [<c01cbe35>] nfsd+0x168/0x26b
> [<c01cbccd>] ? nfsd+0x0/0x26b
> [<c01037db>] kernel_thread_helper+0x7/0x10
> =======================
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