> [ INFO: possible circular locking dependency detected ]
> 2.6.26-rc1-00279-g28a4acb #13
> -------------------------------------------------------
> nfsd/3087 is trying to acquire lock:
> (iprune_mutex){--..}, at: [<c016f947>] shrink_icache_memory+0x38/0x19b
>
> but task is already holding lock:
> (&(&ip->i_iolock)->mr_lock){----}, at: [<c0210b83>] 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){----}:
> [<c01352e6>] __lock_acquire+0xa0c/0xbc6
> [<c013550a>] lock_acquire+0x6a/0x86
> [<c012c39a>] down_write_nested+0x33/0x6a
> [<c0210b5c>] xfs_ilock+0x7b/0xd6
> [<c0210cd5>] xfs_ireclaim+0x1d/0x59
> [<c022edfe>] xfs_finish_reclaim+0x173/0x195
> [<c0230fa3>] xfs_reclaim+0xb3/0x138
> [<c023b4cb>] xfs_fs_clear_inode+0x55/0x8e
> [<c016f60b>] clear_inode+0x83/0xd2
> [<c016f88a>] dispose_list+0x3c/0xc1
> [<c016fa82>] shrink_icache_memory+0x173/0x19b
> [<c014a68d>] shrink_slab+0xda/0x14e
> [<c014a8e5>] try_to_free_pages+0x1e4/0x2a2
> [<c0146997>] __alloc_pages_internal+0x23a/0x39d
> [<c0146b11>] __alloc_pages+0xa/0xc
> [<c01483b2>] __do_page_cache_readahead+0xaa/0x16a
> [<c01484bc>] force_page_cache_readahead+0x4a/0x74
> [<c014c9b0>] sys_madvise+0x308/0x400
> [<c0102b25>] sysenter_past_esp+0x6a/0xb1
> [<ffffffff>] 0xffffffff
>
> -> #0 (iprune_mutex){--..}:
> [<c0135203>] __lock_acquire+0x929/0xbc6
> [<c013550a>] lock_acquire+0x6a/0x86
> [<c0356a6f>] mutex_lock_nested+0xb4/0x226
> [<c016f947>] shrink_icache_memory+0x38/0x19b
> [<c014a68d>] shrink_slab+0xda/0x14e
> [<c014a8e5>] try_to_free_pages+0x1e4/0x2a2
> [<c0146997>] __alloc_pages_internal+0x23a/0x39d
> [<c0146b11>] __alloc_pages+0xa/0xc
> [<c01483b2>] __do_page_cache_readahead+0xaa/0x16a
> [<c014866c>] ondemand_readahead+0x119/0x127
> [<c01486cc>] page_cache_async_readahead+0x52/0x5d
> [<c0178e46>] generic_file_splice_read+0x290/0x4a8
> [<c0239f06>] xfs_splice_read+0x4b/0x78
> [<c0237713>] xfs_file_splice_read+0x24/0x29
> [<c0178182>] do_splice_to+0x45/0x63
> [<c01783f6>] splice_direct_to_actor+0xab/0x150
> [<c01ce8e1>] nfsd_vfs_read+0x1ed/0x2d0
> [<c01ced50>] nfsd_read+0x82/0x99
> [<c01d42bc>] nfsd3_proc_read+0xdf/0x12a
> [<c01cb40b>] nfsd_dispatch+0xcf/0x19e
> [<c033f484>] svc_process+0x3b3/0x68b
> [<c01cb939>] nfsd+0x168/0x26b
> [<c0103747>] kernel_thread_helper+0x7/0x10
> [<ffffffff>] 0xffffffff
>
> other info that might help us debug this:
>
> 3 locks held by nfsd/3087:
> #0: (hash_sem){..--}, at: [<c01d1538>] exp_readlock+0xd/0xf
> #1: (&(&ip->i_iolock)->mr_lock){----}, at: [<c0210b83>] xfs_ilock+0xa2/0xd6
> #2: (shrinker_rwsem){----}, at: [<c014a5d7>] shrink_slab+0x24/0x14e
>
> stack backtrace:
> Pid: 3087, comm: nfsd Not tainted 2.6.26-rc1-00279-g28a4acb #13
> [<c0133498>] print_circular_bug_tail+0x5a/0x65
> [<c0133d99>] ? print_circular_bug_header+0xa8/0xb3
> [<c0135203>] __lock_acquire+0x929/0xbc6
> [<c0106c1a>] ? native_sched_clock+0x8b/0x9f
> [<c013550a>] lock_acquire+0x6a/0x86
> [<c016f947>] ? shrink_icache_memory+0x38/0x19b
> [<c0356a6f>] mutex_lock_nested+0xb4/0x226
> [<c016f947>] ? shrink_icache_memory+0x38/0x19b
> [<c016f947>] ? shrink_icache_memory+0x38/0x19b
> [<c016f947>] shrink_icache_memory+0x38/0x19b
> [<c014a68d>] shrink_slab+0xda/0x14e
> [<c014a8e5>] try_to_free_pages+0x1e4/0x2a2
> [<c03583c8>] ? _spin_unlock_irqrestore+0x36/0x58
> [<c014982f>] ? isolate_pages_global+0x0/0x3e
> [<c0146997>] __alloc_pages_internal+0x23a/0x39d
> [<c0146b11>] __alloc_pages+0xa/0xc
> [<c01483b2>] __do_page_cache_readahead+0xaa/0x16a
> [<c014866c>] ondemand_readahead+0x119/0x127
> [<c01486cc>] page_cache_async_readahead+0x52/0x5d
> [<c0178e46>] generic_file_splice_read+0x290/0x4a8
> [<c0358305>] ? _spin_unlock+0x27/0x3c
> [<c0250e55>] ? _atomic_dec_and_lock+0x25/0x30
> [<c016ed3f>] ? iput+0x24/0x4e
> [<c0135484>] ? __lock_acquire+0xbaa/0xbc6
> [<c01cb12a>] ? exportfs_decode_fh+0x9b/0x1a1
> [<c0178245>] ? spd_release_page+0x0/0xf
> [<c0239f06>] xfs_splice_read+0x4b/0x78
> [<c0237713>] xfs_file_splice_read+0x24/0x29
> [<c0178182>] do_splice_to+0x45/0x63
> [<c01783f6>] splice_direct_to_actor+0xab/0x150
> [<c01ce9c4>] ? nfsd_direct_splice_actor+0x0/0xf
> [<c01ce8e1>] nfsd_vfs_read+0x1ed/0x2d0
> [<c01ced50>] nfsd_read+0x82/0x99
> [<c01d42bc>] nfsd3_proc_read+0xdf/0x12a
> [<c01cb40b>] nfsd_dispatch+0xcf/0x19e
> [<c033f484>] svc_process+0x3b3/0x68b
> [<c01cb939>] nfsd+0x168/0x26b
> [<c01cb7d1>] ? nfsd+0x0/0x26b
> [<c0103747>] kernel_thread_helper+0x7/0x10
> --
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