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Date: Wed, 11 Apr 2007 00:09:32 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: "Yuriy N. Shkandybin" <jura@...ams.com>
Cc: <jarkao2@...pl>, <paulus@...ba.org>, netdev@...r.kernel.org
Subject: Re: + ppp_generic-fix-lockdep-warning.patch added to -mm tree
(added netdev)
On Wed, 11 Apr 2007 09:57:33 +0400 "Yuriy N. Shkandybin" <jura@...ams.com> wrote:
> I've tested 2.6.21-rc6-mm1
> Linux vpn1 2.6.21-rc6-mm1 #4 SMP Wed Apr 11 03:34:26 MSD 2007 x86_64
> Intel(R) Pentium(R) D CPU 2.80GHz GenuineIntel GNU/Linux
>
> warn appeares upon first pppoe connection to rp-pppoe server in kernel mode
>
> result:
> =======================================================
> [ INFO: possible circular locking dependency detected ]
> 2.6.21-rc6-mm1 #4
> -------------------------------------------------------
> pppd/14305 is trying to acquire lock:
> (&vlan_netdev_xmit_lock_key){-...}, at: [<ffffffff8022f90b>]
> dev_queue_xmit+0x26b/0x300
>
> but task is already holding lock:
> (&pch->downl#2){-+..}, at: [<ffffffff80388d3c>] ppp_push+0x5f/0xa7
>
> which lock already depends on the new lock.
>
>
> the existing dependency chain (in reverse order) is:
>
> -> #3 (&pch->downl#2){-+..}:
> [<ffffffff80290c5f>] __lock_acquire+0xedf/0x1048
> [<ffffffff80290e17>] lock_acquire+0x4f/0x78
> [<ffffffff80388d3c>] ppp_push+0x5f/0xa7
> [<ffffffff80263434>] _spin_lock_bh+0x2a/0x39
> [<ffffffff80388d3c>] ppp_push+0x5f/0xa7
> [<ffffffff8038967d>] ppp_xmit_process+0x3d/0x590
> [<ffffffff8038b915>] ppp_write+0x105/0x140
> [<ffffffff802163f3>] vfs_write+0xa3/0xf0
> [<ffffffff80216e04>] sys_write+0x47/0x75
> [<ffffffff8025d11e>] system_call+0x7e/0x83
> [<ffffffffffffffff>] 0xffffffffffffffff
>
> -> #2 (&ppp->wlock){-+..}:
> [<ffffffff80290c5f>] __lock_acquire+0xedf/0x1048
> [<ffffffff80290e17>] lock_acquire+0x4f/0x78
> [<ffffffff80389667>] ppp_xmit_process+0x27/0x590
> [<ffffffff80263434>] _spin_lock_bh+0x2a/0x39
> [<ffffffff80389667>] ppp_xmit_process+0x27/0x590
> [<ffffffff8038b78c>] ppp_start_xmit+0x1cc/0x250
> [<ffffffff803c1bff>] dev_hard_start_xmit+0x22f/0x290
> [<ffffffff803ccbf1>] __qdisc_run+0xd1/0x1f8
> [<ffffffff8022f928>] dev_queue_xmit+0x288/0x300
> [<ffffffff80239b72>] ip_mc_output+0x292/0x3f0
> [<ffffffff803eb991>] raw_sendmsg+0x511/0x7c3
> [<ffffffff80245a25>] inet_sendmsg+0x35/0x55
> [<ffffffff80254da7>] sock_sendmsg+0xdf/0x102
> [<ffffffff8028f826>] trace_hardirqs_on+0xc6/0x160
> [<ffffffff802885da>] autoremove_wake_function+0x0/0x46
> [<ffffffff80263324>] _spin_unlock_bh+0x2f/0x36
> [<ffffffff80230ec8>] release_sock+0xcd/0xd6
> [<ffffffff803dbcc2>] ip_setsockopt+0x142/0xbb3
> [<ffffffff803bf33c>] verify_iovec+0x3c/0xc2
> [<ffffffff803b8e9d>] sys_sendmsg+0x133/0x248
> [<ffffffff8028f826>] trace_hardirqs_on+0xc6/0x160
> [<ffffffff80282028>] getrusage+0x1b8/0x1d9
> [<ffffffff8028f826>] trace_hardirqs_on+0xc6/0x160
> [<ffffffff80262e27>] trace_hardirqs_on_thunk+0x35/0x37
> [<ffffffff8025d11e>] system_call+0x7e/0x83
> [<ffffffffffffffff>] 0xffffffffffffffff
>
> -> #1 (&dev->_xmit_lock){-+..}:
> [<ffffffff80290c5f>] __lock_acquire+0xedf/0x1048
> [<ffffffff80290e17>] lock_acquire+0x4f/0x78
> [<ffffffff803c4f59>] dev_mc_add+0x40/0x169
> [<ffffffff80263434>] _spin_lock_bh+0x2a/0x39
> [<ffffffff803c4f59>] dev_mc_add+0x40/0x169
> [<ffffffff80403457>] vlan_dev_set_multicast_list+0xa7/0x2b8
> [<ffffffff803c4c64>] __dev_mc_upload+0x24/0x26
> [<ffffffff803c4ff7>] dev_mc_add+0xde/0x169
> [<ffffffff803f47d7>] igmp_group_added+0x56/0x5f
> [<ffffffff8026322b>] _write_unlock_bh+0x2f/0x36
> [<ffffffff803f4965>] ip_mc_inc_group+0x105/0x17a
> [<ffffffff803f49fc>] ip_mc_up+0x22/0x69
> [<ffffffff803f1b48>] inetdev_event+0x1b8/0x2f0
> [<ffffffff80281d69>] notifier_call_chain+0x49/0x6b
> [<ffffffff80281dcc>] __raw_notifier_call_chain+0x9/0xb
> [<ffffffff80281ddf>] raw_notifier_call_chain+0x11/0x13
> [<ffffffff803c335d>] dev_open+0x7d/0x80
> [<ffffffff803c1527>] dev_change_flags+0x107/0x138
> [<ffffffff803f290c>] devinet_ioctl+0x5cc/0x720
> [<ffffffff803c2fec>] dev_ioctl+0x1fc/0x31b
> [<ffffffff8022104f>] __up_read+0x3f/0x9d
> [<ffffffff803f2d5d>] inet_ioctl+0x5d/0x77
> [<ffffffff803b854f>] sock_ioctl+0x4f/0x215
> [<ffffffff80241aca>] do_ioctl+0x2a/0x83
> [<ffffffff8022fe92>] vfs_ioctl+0x62/0x2b0
> [<ffffffff8028f826>] trace_hardirqs_on+0xc6/0x160
> [<ffffffff8024cef0>] sys_ioctl+0x41/0x65
> [<ffffffff8025d11e>] system_call+0x7e/0x83
> [<ffffffffffffffff>] 0xffffffffffffffff
>
> -> #0 (&vlan_netdev_xmit_lock_key){-...}:
> [<ffffffff8028ded0>] print_circular_bug_entry+0x49/0x59
> [<ffffffff80290ad3>] __lock_acquire+0xd53/0x1048
> [<ffffffff8020a5d5>] kmem_cache_alloc+0x1a5/0x5e0
> [<ffffffff8028f7ea>] trace_hardirqs_on+0x8a/0x160
> [<ffffffff80290e17>] lock_acquire+0x4f/0x78
> [<ffffffff8022f90b>] dev_queue_xmit+0x26b/0x300
> [<ffffffff802633fb>] _spin_lock+0x25/0x34
> [<ffffffff8022f90b>] dev_queue_xmit+0x26b/0x300
> [<ffffffff8038d753>] __pppoe_xmit+0x1e8/0x265
> [<ffffffff8038d7dc>] pppoe_xmit+0xc/0xe
> [<ffffffff80388d51>] ppp_push+0x74/0xa7
> [<ffffffff8038967d>] ppp_xmit_process+0x3d/0x590
> [<ffffffff8038b915>] ppp_write+0x105/0x140
> [<ffffffff802163f3>] vfs_write+0xa3/0xf0
> [<ffffffff80216e04>] sys_write+0x47/0x75
> [<ffffffff8025d11e>] system_call+0x7e/0x83
> [<ffffffffffffffff>] 0xffffffffffffffff
>
> other info that might help us debug this:
>
> 2 locks held by pppd/14305:
> #0: (&ppp->wlock){-+..}, at: [<ffffffff80389667>]
> ppp_xmit_process+0x27/0x590
> #1: (&pch->downl#2){-+..}, at: [<ffffffff80388d3c>] ppp_push+0x5f/0xa7
>
> stack backtrace:
>
> Call Trace:
> [<ffffffff8028e95b>] print_circular_bug_tail+0x7c/0x91
> [<ffffffff8028ded0>] print_circular_bug_entry+0x49/0x59
> [<ffffffff80290ad3>] __lock_acquire+0xd53/0x1048
> [<ffffffff8020a5d5>] kmem_cache_alloc+0x1a5/0x5e0
> [<ffffffff8028f7ea>] trace_hardirqs_on+0x8a/0x160
> [<ffffffff80290e17>] lock_acquire+0x4f/0x78
> [<ffffffff8022f90b>] dev_queue_xmit+0x26b/0x300
> [<ffffffff802633fb>] _spin_lock+0x25/0x34
> [<ffffffff8022f90b>] dev_queue_xmit+0x26b/0x300
> [<ffffffff8038d753>] __pppoe_xmit+0x1e8/0x265
> [<ffffffff8038d7dc>] pppoe_xmit+0xc/0xe
> [<ffffffff80388d51>] ppp_push+0x74/0xa7
> [<ffffffff8038967d>] ppp_xmit_process+0x3d/0x590
> [<ffffffff8038b915>] ppp_write+0x105/0x140
> [<ffffffff802163f3>] vfs_write+0xa3/0xf0
> [<ffffffff80216e04>] sys_write+0x47/0x75
> [<ffffffff8025d11e>] system_call+0x7e/0x83
>
> INFO: lockdep is turned off.
Thanks. So you're saying that
ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.21-rc6/2.6.21-rc6-mm1/broken-out/ppp_generic-fix-lockdep-warning.patch
did not fix anything?
-
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