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Date: Fri, 9 Jan 2009 15:33:15 +1100
From: Herbert Xu <herbert@...dor.apana.org.au>
To: "J. Bruce Fields" <bfields@...ldses.org>
Cc: netdev@...r.kernel.org, linux-nfs@...r.kernel.org,
Trond Myklebust <trond@...app.com>,
Ingo Molnar <mingo@...e.hu>, Nick Piggin <npiggin@...e.de>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: nfs client lockdep warning
On Thu, Jan 08, 2009 at 09:20:56PM +0000, J. Bruce Fields wrote:
>
> > > Jan 8 15:29:17 ying3 kernel: =======================================================
> > > Jan 8 15:29:17 ying3 kernel: [ INFO: possible circular locking dependency detected ]
> > > Jan 8 15:29:17 ying3 kernel: 2.6.28-07532-g393a64e #71
> > > Jan 8 15:29:17 ying3 kernel: -------------------------------------------------------
> > > Jan 8 15:29:17 ying3 kernel: tlocklfs/3527 is trying to acquire lock:
> > > Jan 8 15:29:17 ying3 kernel: (sk_lock-AF_INET-RPC){--..}, at: [<c076609c>] tcp_sendmsg+0x1c/0xa80
> > > Jan 8 15:29:17 ying3 kernel:
> > > Jan 8 15:29:17 ying3 kernel: but task is already holding lock:
> > > Jan 8 15:29:17 ying3 kernel: (&mm->mmap_sem){----}, at: [<c0835fb7>] do_page_fault+0xc7/0x820
> > > Jan 8 15:29:17 ying3 kernel:
> > > Jan 8 15:29:17 ying3 kernel: which lock already depends on the new lock.
> > > Jan 8 15:29:17 ying3 kernel:
> > > Jan 8 15:29:17 ying3 kernel:
> > > Jan 8 15:29:17 ying3 kernel: the existing dependency chain (in reverse order) is:
> > > Jan 8 15:29:17 ying3 kernel:
> > > Jan 8 15:29:17 ying3 kernel: -> #1 (&mm->mmap_sem){----}:
> > > Jan 8 15:29:17 ying3 kernel: [<c024900d>] __lock_acquire+0xfcd/0x18e0
> > > Jan 8 15:29:17 ying3 kernel: [<c024997c>] lock_acquire+0x5c/0x80
> > > Jan 8 15:29:17 ying3 kernel: [<c027dffb>] might_fault+0x7b/0xa0
This is a false positive introduced by might_fault. As this is
a send request from the kernel, it should never fault.
> > > Jan 8 15:29:17 ying3 kernel: [<c054bb26>] copy_from_user+0x36/0x90
> > > Jan 8 15:29:17 ying3 kernel: [<c0737800>] memcpy_fromiovecend+0x60/0x90
> > > Jan 8 15:29:17 ying3 kernel: [<c075ce9f>] ip_generic_getfrag+0x9f/0xb0
> > > Jan 8 15:29:17 ying3 kernel: [<c075cb6b>] ip_append_data+0x6bb/0x950
> > > Jan 8 15:29:17 ying3 kernel: [<c077cb0d>] udp_sendmsg+0x2bd/0x680
> > > Jan 8 15:29:17 ying3 kernel: [<c07835f9>] inet_sendmsg+0x39/0x70
> > > Jan 8 15:29:17 ying3 kernel: [<c072f0e6>] sock_sendmsg+0xd6/0x100
> > > Jan 8 15:29:17 ying3 kernel: [<c072f485>] kernel_sendmsg+0x35/0x50
> > > Jan 8 15:29:17 ying3 kernel: [<c07da698>] xs_send_kvec+0xa8/0xb0
> > > Jan 8 15:29:17 ying3 kernel: [<c07da711>] xs_sendpages+0x71/0x210
> > > Jan 8 15:29:17 ying3 kernel: [<c07dab30>] xs_udp_send_request+0x40/0x120
> > > Jan 8 15:29:17 ying3 kernel: [<c07d91ff>] xprt_transmit+0x6f/0x280
> > > Jan 8 15:29:17 ying3 kernel: [<c07d6c1f>] call_transmit+0x17f/0x250
> > > Jan 8 15:29:17 ying3 kernel: [<c07dda13>] __rpc_execute+0x73/0x250
> > > Jan 8 15:29:17 ying3 kernel: [<c07ddc0e>] rpc_execute+0x1e/0x30
> > > Jan 8 15:29:17 ying3 kernel: [<c07d7705>] rpc_run_task+0x35/0x70
> > > Jan 8 15:29:17 ying3 kernel: [<c07d7860>] rpc_call_sync+0x40/0x70
> > > Jan 8 15:29:17 ying3 kernel: [<c07e5312>] rpcb_register_call+0xa2/0xd0
> > > Jan 8 15:29:17 ying3 kernel: [<c07e53d2>] rpcb_register+0x92/0xe0
> > > Jan 8 15:29:17 ying3 kernel: [<c07e0446>] svc_unregister+0x66/0xe0
> > > Jan 8 15:29:17 ying3 kernel: [<c07e0c66>] __svc_create+0x1c6/0x1f0
> > > Jan 8 15:29:17 ying3 kernel: [<c07e0e13>] svc_create+0x23/0x30
> > > Jan 8 15:29:17 ying3 kernel: [<c0396293>] nfs_callback_up+0x73/0x1b0
> > > Jan 8 15:29:17 ying3 kernel: [<c036bb95>] nfs_get_client+0x2d5/0x410
> > > Jan 8 15:29:17 ying3 kernel: [<c036bd15>] nfs4_set_client+0x45/0x1e0
> > > Jan 8 15:29:17 ying3 kernel: [<c036c57e>] nfs4_create_server+0xae/0x430
> > > Jan 8 15:29:17 ying3 kernel: [<c0376fda>] nfs4_get_sb+0x34a/0x5d0
> > > Jan 8 15:29:17 ying3 kernel: [<c029663e>] vfs_kern_mount+0x5e/0x130
> > > Jan 8 15:29:17 ying3 kernel: [<c029676e>] do_kern_mount+0x3e/0xe0
> > > Jan 8 15:29:17 ying3 kernel: [<c02aca44>] do_mount+0x434/0x7b0
> > > Jan 8 15:29:17 ying3 kernel: [<c02ace51>] sys_mount+0x91/0xc0
> > > Jan 8 15:29:17 ying3 kernel: [<c02034c5>] sysenter_do_call+0x12/0x35
> > > Jan 8 15:29:17 ying3 kernel: [<ffffffff>] 0xffffffff
> > > Jan 8 15:29:17 ying3 kernel:
> > > Jan 8 15:29:17 ying3 kernel: -> #0 (sk_lock-AF_INET-RPC){--..}:
> > > Jan 8 15:29:17 ying3 kernel: [<c024923d>] __lock_acquire+0x11fd/0x18e0
> > > Jan 8 15:29:17 ying3 kernel: [<c024997c>] lock_acquire+0x5c/0x80
> > > Jan 8 15:29:17 ying3 kernel: [<c0731574>] lock_sock_nested+0xc4/0xe0
> > > Jan 8 15:29:17 ying3 kernel: [<c076609c>] tcp_sendmsg+0x1c/0xa80
> > > Jan 8 15:29:17 ying3 kernel: [<c072f0e6>] sock_sendmsg+0xd6/0x100
> > > Jan 8 15:29:17 ying3 kernel: [<c072f485>] kernel_sendmsg+0x35/0x50
> > > Jan 8 15:29:17 ying3 kernel: [<c07da698>] xs_send_kvec+0xa8/0xb0
> > > Jan 8 15:29:17 ying3 kernel: [<c07da711>] xs_sendpages+0x71/0x210
> > > Jan 8 15:29:17 ying3 kernel: [<c07da9d8>] xs_tcp_send_request+0x58/0x170
> > > Jan 8 15:29:17 ying3 kernel: [<c07d91ff>] xprt_transmit+0x6f/0x280
> > > Jan 8 15:29:17 ying3 kernel: [<c07d6c1f>] call_transmit+0x17f/0x250
> > > Jan 8 15:29:17 ying3 kernel: [<c07dda13>] __rpc_execute+0x73/0x250
> > > Jan 8 15:29:17 ying3 kernel: [<c07ddc0e>] rpc_execute+0x1e/0x30
> > > Jan 8 15:29:17 ying3 kernel: [<c07d7705>] rpc_run_task+0x35/0x70
> > > Jan 8 15:29:17 ying3 kernel: [<c037c924>] nfs_read_rpcsetup+0x174/0x1f0
> > > Jan 8 15:29:17 ying3 kernel: [<c037ce8e>] nfs_pagein_one+0x9e/0xe0
> > > Jan 8 15:29:17 ying3 kernel: [<c037a73a>] nfs_pageio_doio+0x3a/0x80
> > > Jan 8 15:29:17 ying3 kernel: [<c037a78d>] nfs_pageio_complete+0xd/0x10
> > > Jan 8 15:29:17 ying3 kernel: [<c037c21c>] nfs_readpages+0xec/0x1d0
> > > Jan 8 15:29:17 ying3 kernel: [<c02735cc>] __do_page_cache_readahead+0x1bc/0x280
> > > Jan 8 15:29:17 ying3 kernel: [<c02736e0>] do_page_cache_readahead+0x50/0x70
> > > Jan 8 15:29:17 ying3 kernel: [<c026b82f>] filemap_fault+0x31f/0x470
> > > Jan 8 15:29:17 ying3 kernel: [<c027e370>] __do_fault+0x40/0x3d0
> > > Jan 8 15:29:17 ying3 kernel: [<c027ff91>] handle_mm_fault+0x111/0x610
> > > Jan 8 15:29:17 ying3 kernel: [<c0836105>] do_page_fault+0x215/0x820
> > > Jan 8 15:29:17 ying3 kernel: [<c0834347>] error_code+0x6f/0x74
> > > Jan 8 15:29:17 ying3 kernel: [<c02caff5>] load_elf_binary+0x8e5/0x1a20
> > > Jan 8 15:29:17 ying3 kernel: [<c02990a3>] search_binary_handler+0x173/0x2f0
> > > Jan 8 15:29:17 ying3 kernel: [<c029a31d>] do_execve+0x1cd/0x220
> > > Jan 8 15:29:17 ying3 kernel: [<c0201793>] sys_execve+0x43/0x70
> > > Jan 8 15:29:17 ying3 kernel: [<c02034c5>] sysenter_do_call+0x12/0x35
> > > Jan 8 15:29:17 ying3 kernel: [<ffffffff>] 0xffffffff
> > > Jan 8 15:29:17 ying3 kernel:
> > > Jan 8 15:29:17 ying3 kernel: other info that might help us debug this:
> > > Jan 8 15:29:17 ying3 kernel:
> > > Jan 8 15:29:17 ying3 kernel: 2 locks held by tlocklfs/3527:
> > > Jan 8 15:29:17 ying3 kernel: #0: (&p->cred_exec_mutex){--..}, at: [<c029a1bb>] do_execve+0x6b/0x220
> > > Jan 8 15:29:17 ying3 kernel: #1: (&mm->mmap_sem){----}, at: [<c0835fb7>] do_page_fault+0xc7/0x820
> > > Jan 8 15:29:17 ying3 kernel:
> > > Jan 8 15:29:17 ying3 kernel: stack backtrace:
> > > Jan 8 15:29:17 ying3 kernel: Pid: 3527, comm: tlocklfs Not tainted 2.6.28-07532-g393a64e #71
> > > Jan 8 15:29:17 ying3 kernel: Call Trace:
> > > Jan 8 15:29:17 ying3 kernel: [<c083091a>] ? printk+0x1d/0x1f
> > > Jan 8 15:29:17 ying3 kernel: [<c0247c18>] print_circular_bug_tail+0xc8/0xd0
> > > Jan 8 15:29:17 ying3 kernel: [<c024923d>] __lock_acquire+0x11fd/0x18e0
> > > Jan 8 15:29:17 ying3 kernel: [<c07314dc>] ? lock_sock_nested+0x2c/0xe0
> > > Jan 8 15:29:17 ying3 kernel: [<c024997c>] lock_acquire+0x5c/0x80
> > > Jan 8 15:29:17 ying3 kernel: [<c076609c>] ? tcp_sendmsg+0x1c/0xa80
> > > Jan 8 15:29:17 ying3 kernel: [<c0731574>] lock_sock_nested+0xc4/0xe0
> > > Jan 8 15:29:17 ying3 kernel: [<c076609c>] ? tcp_sendmsg+0x1c/0xa80
> > > Jan 8 15:29:17 ying3 kernel: [<c0270934>] ? free_hot_cold_page+0x174/0x2a0
> > > Jan 8 15:29:17 ying3 kernel: [<c076609c>] tcp_sendmsg+0x1c/0xa80
> > > Jan 8 15:29:17 ying3 kernel: [<c02451aa>] ? find_usage_backwards+0xaa/0x120
> > > Jan 8 15:29:17 ying3 kernel: [<c0270b86>] ? free_pages+0x46/0x50
> > > Jan 8 15:29:17 ying3 kernel: [<c02451aa>] ? find_usage_backwards+0xaa/0x120
> > > Jan 8 15:29:17 ying3 kernel: [<c02451aa>] ? find_usage_backwards+0xaa/0x120
> > > Jan 8 15:29:17 ying3 kernel: [<c072f0e6>] sock_sendmsg+0xd6/0x100
> > > Jan 8 15:29:17 ying3 kernel: [<c0239280>] ? autoremove_wake_function+0x0/0x50
> > > Jan 8 15:29:17 ying3 kernel: [<c0248ea0>] ? __lock_acquire+0xe60/0x18e0
> > > Jan 8 15:29:17 ying3 kernel: [<c0248ea0>] ? __lock_acquire+0xe60/0x18e0
> > > Jan 8 15:29:17 ying3 kernel: [<c072f485>] kernel_sendmsg+0x35/0x50
> > > Jan 8 15:29:17 ying3 kernel: [<c07da698>] xs_send_kvec+0xa8/0xb0
> > > Jan 8 15:29:17 ying3 kernel: [<c07da711>] xs_sendpages+0x71/0x210
> > > Jan 8 15:29:17 ying3 kernel: [<c055020f>] ? debug_object_deactivate+0xbf/0x100
> > > Jan 8 15:29:17 ying3 kernel: [<c07da9d8>] xs_tcp_send_request+0x58/0x170
> > > Jan 8 15:29:17 ying3 kernel: [<c07d91ff>] xprt_transmit+0x6f/0x280
> > > Jan 8 15:29:17 ying3 kernel: [<c0392760>] ? nfs4_xdr_enc_read+0x0/0x110
> > > Jan 8 15:29:17 ying3 kernel: [<c07d6c1f>] call_transmit+0x17f/0x250
> > > Jan 8 15:29:17 ying3 kernel: [<c07dda13>] __rpc_execute+0x73/0x250
> > > Jan 8 15:29:17 ying3 kernel: [<c0833a9c>] ? _spin_unlock+0x2c/0x50
> > > Jan 8 15:29:17 ying3 kernel: [<c07dd297>] ? rpc_set_active+0x67/0x80
> > > Jan 8 15:29:17 ying3 kernel: [<c07ddc0e>] rpc_execute+0x1e/0x30
> > > Jan 8 15:29:17 ying3 kernel: [<c07d7705>] rpc_run_task+0x35/0x70
> > > Jan 8 15:29:17 ying3 kernel: [<c037c924>] nfs_read_rpcsetup+0x174/0x1f0
> > > Jan 8 15:29:17 ying3 kernel: [<c0290b61>] ? kmem_cache_alloc+0xd1/0x140
> > > Jan 8 15:29:17 ying3 kernel: [<c026d583>] ? mempool_alloc_slab+0x13/0x20
> > > Jan 8 15:29:17 ying3 last message repeated 2 times
> > > Jan 8 15:29:17 ying3 kernel: [<c037ce8e>] nfs_pagein_one+0x9e/0xe0
> > > Jan 8 15:29:17 ying3 kernel: [<c037a73a>] nfs_pageio_doio+0x3a/0x80
> > > Jan 8 15:29:17 ying3 kernel: [<c037a78d>] nfs_pageio_complete+0xd/0x10
> > > Jan 8 15:29:17 ying3 kernel: [<c037c21c>] nfs_readpages+0xec/0x1d0
> > > Jan 8 15:29:17 ying3 kernel: [<c02711c3>] ? __alloc_pages_internal+0xc3/0x4d0
> > > Jan 8 15:29:17 ying3 kernel: [<c037cdf0>] ? nfs_pagein_one+0x0/0xe0
> > > Jan 8 15:29:17 ying3 kernel: [<c037c130>] ? nfs_readpages+0x0/0x1d0
> > > Jan 8 15:29:17 ying3 kernel: [<c02735cc>] __do_page_cache_readahead+0x1bc/0x280
> > > Jan 8 15:29:17 ying3 kernel: [<c02734d5>] ? __do_page_cache_readahead+0xc5/0x280
> > > Jan 8 15:29:17 ying3 kernel: [<c02736e0>] do_page_cache_readahead+0x50/0x70
> > > Jan 8 15:29:17 ying3 kernel: [<c026b82f>] filemap_fault+0x31f/0x470
> > > Jan 8 15:29:17 ying3 kernel: [<c027e370>] __do_fault+0x40/0x3d0
> > > Jan 8 15:29:17 ying3 kernel: [<c0833a9c>] ? _spin_unlock+0x2c/0x50
> > > Jan 8 15:29:17 ying3 kernel: [<c027ff91>] handle_mm_fault+0x111/0x610
> > > Jan 8 15:29:17 ying3 kernel: [<c0835fb7>] ? do_page_fault+0xc7/0x820
> > > Jan 8 15:29:17 ying3 kernel: [<c023cd8d>] ? down_read_trylock+0x5d/0x70
> > > Jan 8 15:29:17 ying3 kernel: [<c0836105>] do_page_fault+0x215/0x820
> > > Jan 8 15:29:17 ying3 kernel: [<c0546741>] ? prio_tree_insert+0x211/0x290
> > > Jan 8 15:29:17 ying3 kernel: [<c0833a9c>] ? _spin_unlock+0x2c/0x50
> > > Jan 8 15:29:17 ying3 kernel: [<c0283a52>] ? vma_link+0x82/0xa0
> > > Jan 8 15:29:17 ying3 kernel: [<c0284fd2>] ? mmap_region+0x2d2/0x4f0
> > > Jan 8 15:29:17 ying3 kernel: [<c027dfca>] ? might_fault+0x4a/0xa0
> > > Jan 8 15:29:17 ying3 kernel: [<c0835ef0>] ? do_page_fault+0x0/0x820
> > > Jan 8 15:29:17 ying3 kernel: [<c0834347>] error_code+0x6f/0x74
> > > Jan 8 15:29:17 ying3 kernel: [<c027007b>] ? __free_pages_ok+0x27b/0x480
> > > Jan 8 15:29:17 ying3 kernel: [<c054b9b7>] ? clear_user+0x47/0x60
> > > Jan 8 15:29:17 ying3 kernel: [<c02caff5>] load_elf_binary+0x8e5/0x1a20
> > > Jan 8 15:29:17 ying3 kernel: [<c0247411>] ? mark_held_locks+0x41/0x80
> > > Jan 8 15:29:17 ying3 kernel: [<c0833a55>] ? _spin_unlock_irqrestore+0x55/0x70
> > > Jan 8 15:29:17 ying3 kernel: [<c0247651>] ? trace_hardirqs_on_caller+0x141/0x1a0
> > > Jan 8 15:29:17 ying3 kernel: [<c0298f8f>] ? search_binary_handler+0x5f/0x2f0
> > > Jan 8 15:29:17 ying3 kernel: [<c02990a3>] search_binary_handler+0x173/0x2f0
> > > Jan 8 15:29:17 ying3 kernel: [<c02ca710>] ? load_elf_binary+0x0/0x1a20
> > > Jan 8 15:29:17 ying3 kernel: [<c029a31d>] do_execve+0x1cd/0x220
> > > Jan 8 15:29:17 ying3 kernel: [<c0201793>] sys_execve+0x43/0x70
> > > Jan 8 15:29:17 ying3 kernel: [<c02034c5>] sysenter_do_call+0x12/0x35
> > > Jan 8 15:29:26 ying3 kernel: tlocklfs used greatest stack depth: 4252 bytes left
> > > Jan 8 15:29:55 ying3 kernel: aoe: 00188b809a6e e2.3 v400f has 2048000 sectors
> > > Jan 8 15:29:55 ying3 kernel: etherd/e2.3: unknown partition table
Cheers,
--
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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