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Date: Wed, 8 Jun 2016 18:43:48 -0700
From: Eric Dumazet <edumazet@...gle.com>
To: David Ahern <dsa@...ulusnetworks.com>
Cc: "David S . Miller" <davem@...emloft.net>,
netdev <netdev@...r.kernel.org>,
Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [PATCH net-next 2/4] net: vrf: call netdev_lockdep_set_classes()
On Wed, Jun 8, 2016 at 6:26 PM, David Ahern <dsa@...ulusnetworks.com> wrote:
> On 6/8/16 5:55 PM, Eric Dumazet wrote:
>>
>> In case a qdisc is used on a vrf device, we need to use different
>> lockdep classes to avoid false positives.
>>
>> Fixes: f9eb8aea2a1e ("net_sched: transform qdisc running bit into a
>> seqcount")
>> Reported-by: David Ahern <dsa@...ulusnetworks.com>
>> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
>> ---
>> drivers/net/vrf.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/vrf.c b/drivers/net/vrf.c
>> index 1b214ea4619a..ee6bc1c5c1ce 100644
>> --- a/drivers/net/vrf.c
>> +++ b/drivers/net/vrf.c
>> @@ -657,7 +657,7 @@ static int vrf_dev_init(struct net_device *dev)
>>
>> /* similarly, oper state is irrelevant; set to up to avoid
>> confusion */
>> dev->operstate = IF_OPER_UP;
>> -
>> + netdev_lockdep_set_classes(dev);
>> return 0;
>>
>> out_rth:
>>
>
> Still see the problem; all 4 patches applied, make clean followed by a build
> just to make sure.
>
> [ 90.956522]
> [ 90.956952] ======================================================
> [ 90.958441] [ INFO: possible circular locking dependency detected ]
> [ 90.959820] 4.7.0-rc1+ #271 Not tainted
> [ 90.960672] -------------------------------------------------------
> [ 90.962051] ping/1585 is trying to acquire lock:
> [ 90.962997] (&(&list->lock)->rlock#3){+.-...}, at: [<ffffffff8140827c>]
> __dev_queue_xmit+0x3d3/0x751
> [ 90.965033]
> [ 90.965033] but task is already holding lock:
> [ 90.966200] (dev->qdisc_running_key ?: &qdisc_running_key#2){+.....},
> at: [<ffffffff814082d1>] __dev_queue_xmit+0x428/0x751
> [ 90.968591]
> [ 90.968591] which lock already depends on the new lock.
> [ 90.968591]
> [ 90.970014]
> [ 90.970014] the existing dependency chain (in reverse order) is:
> [ 90.971287]
> -> #1 (dev->qdisc_running_key ?: &qdisc_running_key#2){+.....}:
> [ 90.972611] [<ffffffff810853b7>] __lock_acquire+0x5e4/0x690
> [ 90.973712] [<ffffffff81085a32>] lock_acquire+0x140/0x1d8
> [ 90.974668] [<ffffffff8140259d>] write_seqcount_begin+0x21/0x24
> [ 90.975673] [<ffffffff814082d1>] __dev_queue_xmit+0x428/0x751
> [ 90.976608] [<ffffffff81408605>] dev_queue_xmit+0xb/0xd
> [ 90.977484] [<ffffffff81411f40>] neigh_resolve_output+0x113/0x12e
> [ 90.978497] [<ffffffff81397881>]
> dst_neigh_output.isra.20+0x13b/0x148
> [ 90.979548] [<ffffffff81397992>] vrf_finish_output+0x104/0x139
> [ 90.980504] [<ffffffff81397b5d>] vrf_output+0x5c/0xc1
> [ 90.981365] [<ffffffff81441ae3>] dst_output+0x2b/0x30
> [ 90.982240] [<ffffffff8144355a>] ip_local_out+0x2a/0x31
> [ 90.983109] [<ffffffff814443cb>] ip_send_skb+0x14/0x38
> [ 90.983974] [<ffffffff8144441d>] ip_push_pending_frames+0x2e/0x31
> [ 90.984887] [<ffffffff814650ca>] raw_sendmsg+0x788/0x9d2
> [ 90.985658] [<ffffffff81472438>] inet_sendmsg+0x35/0x5c
> [ 90.986452] [<ffffffff813ed311>] sock_sendmsg_nosec+0x12/0x1d
> [ 90.987275] [<ffffffff813ee1c5>] ___sys_sendmsg+0x1b1/0x21f
> [ 90.988094] [<ffffffff813ee4ea>] __sys_sendmsg+0x40/0x5e
> [ 90.988882] [<ffffffff813ee51c>] SyS_sendmsg+0x14/0x16
> [ 90.989647] [<ffffffff814f69bc>]
> entry_SYSCALL_64_fastpath+0x1f/0xbd
> [ 90.990590]
> -> #0 (&(&list->lock)->rlock#3){+.-...}:
> [ 90.991368] [<ffffffff8108435a>]
> validate_chain.isra.37+0x7c8/0xa5b
> [ 90.992268] [<ffffffff810853b7>] __lock_acquire+0x5e4/0x690
> [ 90.993114] [<ffffffff81085a32>] lock_acquire+0x140/0x1d8
> [ 90.993955] [<ffffffff814f5ee6>] _raw_spin_lock+0x2f/0x65
> [ 90.994751] [<ffffffff8140827c>] __dev_queue_xmit+0x3d3/0x751
> [ 90.995574] [<ffffffff81408605>] dev_queue_xmit+0xb/0xd
> [ 90.996338] [<ffffffff8146ac86>] arp_xmit+0x32/0x7e
> [ 90.997062] [<ffffffff8146ad0e>] arp_send_dst+0x3c/0x42
> [ 90.997834] [<ffffffff8146af8f>] arp_solicit+0x27b/0x28e
> [ 90.998631] [<ffffffff8140f08f>] neigh_probe+0x4a/0x5e
> [ 90.999407] [<ffffffff8141066f>] __neigh_event_send+0x1d0/0x21b
> [ 91.000264] [<ffffffff814106e5>] neigh_event_send+0x2b/0x2d
> [ 91.001075] [<ffffffff81411e45>] neigh_resolve_output+0x18/0x12e
> [ 91.001956] [<ffffffff814421e8>] ip_finish_output2+0x3c0/0x41c
> [ 91.002803] [<ffffffff81442a7b>] ip_finish_output+0x132/0x13e
> [ 91.003630] [<ffffffff81442aa8>]
> NF_HOOK_COND.constprop.43+0x21/0x8a
> [ 91.004550] [<ffffffff81443c19>] ip_output+0x65/0x6a
> [ 91.005293] [<ffffffff81441ae3>] dst_output+0x2b/0x30
> [ 91.006066] [<ffffffff8144355a>] ip_local_out+0x2a/0x31
> [ 91.006821] [<ffffffff813985f1>] vrf_xmit+0x1f6/0x417
> [ 91.007554] [<ffffffff81407ba8>] dev_hard_start_xmit+0x154/0x337
> [ 91.008410] [<ffffffff81427f15>] sch_direct_xmit+0x98/0x16c
> [ 91.009211] [<ffffffff814082fc>] __dev_queue_xmit+0x453/0x751
> [ 91.010043] [<ffffffff81408605>] dev_queue_xmit+0xb/0xd
> [ 91.010806] [<ffffffff81411f40>] neigh_resolve_output+0x113/0x12e
> [ 91.011690] [<ffffffff81397881>]
> dst_neigh_output.isra.20+0x13b/0x148
> [ 91.012600] [<ffffffff81397992>] vrf_finish_output+0x104/0x139
> [ 91.013431] [<ffffffff81397b5d>] vrf_output+0x5c/0xc1
> [ 91.014172] [<ffffffff81441ae3>] dst_output+0x2b/0x30
> [ 91.014906] [<ffffffff8144355a>] ip_local_out+0x2a/0x31
> [ 91.015659] [<ffffffff814443cb>] ip_send_skb+0x14/0x38
> [ 91.016398] [<ffffffff8144441d>] ip_push_pending_frames+0x2e/0x31
> [ 91.017259] [<ffffffff814650ca>] raw_sendmsg+0x788/0x9d2
> [ 91.018033] [<ffffffff81472438>] inet_sendmsg+0x35/0x5c
> [ 91.018797] [<ffffffff813ed311>] sock_sendmsg_nosec+0x12/0x1d
> [ 91.019615] [<ffffffff813ee1c5>] ___sys_sendmsg+0x1b1/0x21f
> [ 91.020417] [<ffffffff813ee4ea>] __sys_sendmsg+0x40/0x5e
> [ 91.021180] [<ffffffff813ee51c>] SyS_sendmsg+0x14/0x16
> [ 91.021927] [<ffffffff814f69bc>]
> entry_SYSCALL_64_fastpath+0x1f/0xbd
> [ 91.022820]
> [ 91.022820] other info that might help us debug this:
> [ 91.022820]
> [ 91.023848] Possible unsafe locking scenario:
> [ 91.023848]
> [ 91.024595] CPU0 CPU1
> [ 91.025173] ---- ----
> [ 91.025751] lock(dev->qdisc_running_key ?: &qdisc_running_key#2);
> [ 91.026600] lock(&(&list->lock)->rlock#3);
> [ 91.027505] lock(dev->qdisc_running_key ?: &qdisc_running_key#2);
> [ 91.028657] lock(&(&list->lock)->rlock#3);
> [ 91.029257]
> [ 91.029257] *** DEADLOCK ***
> [ 91.029257]
> [ 91.030008] 6 locks held by ping/1585:
> [ 91.030485] #0: (sk_lock-AF_INET){+.+.+.}, at: [<ffffffff8146506b>]
> raw_sendmsg+0x729/0x9d2
> [ 91.031643] #1: (rcu_read_lock_bh){......}, at: [<ffffffff81397076>]
> rcu_lock_acquire+0x0/0x20
> [ 91.032834] #2: (rcu_read_lock_bh){......}, at: [<ffffffff813ffc04>]
> rcu_lock_acquire+0x0/0x20
> [ 91.034040] #3: (dev->qdisc_running_key ?:
> &qdisc_running_key#2){+.....}, at: [<ffffffff814082d1>]
> __dev_queue_xmit+0x428/0x751
> [ 91.035622] #4: (rcu_read_lock_bh){......}, at: [<ffffffff814418d3>]
> rcu_lock_acquire+0x0/0x20
> [ 91.036823] #5: (rcu_read_lock_bh){......}, at: [<ffffffff813ffc04>]
> rcu_lock_acquire+0x0/0x20
> [ 91.038016]
> [ 91.038016] stack backtrace:
> [ 91.038574] CPU: 6 PID: 1585 Comm: ping Not tainted 4.7.0-rc1+ #271
> [ 91.039366] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> 1.7.5-20140531_083030-gandalf 04/01/2014
> [ 91.040634] 0000000000000000 ffff8800b84c72d0 ffffffff8127e395
> ffffffff8254b8c0
> [ 91.041632] ffffffff8254b8c0 ffff8800b84c7310 ffffffff81083461
> ffff8800b9b5e240
> [ 91.042645] ffff8800b9b5ea60 0000000000000004 ffff8800b9b5ea98
> ffff8800b9b5e240
> [ 91.043645] Call Trace:
> [ 91.043968] [<ffffffff8127e395>] dump_stack+0x81/0xb6
> [ 91.044620] [<ffffffff81083461>] print_circular_bug+0x1f6/0x204
> [ 91.045377] [<ffffffff8108435a>] validate_chain.isra.37+0x7c8/0xa5b
> [ 91.046193] [<ffffffff8101c65c>] ? paravirt_sched_clock+0x9/0xd
> [ 91.046951] [<ffffffff810853b7>] __lock_acquire+0x5e4/0x690
> [ 91.047666] [<ffffffff810853b7>] ? __lock_acquire+0x5e4/0x690
> [ 91.048404] [<ffffffff81085a32>] lock_acquire+0x140/0x1d8
> [ 91.049104] [<ffffffff8140827c>] ? __dev_queue_xmit+0x3d3/0x751
> [ 91.049868] [<ffffffff814f5ee6>] _raw_spin_lock+0x2f/0x65
> [ 91.050564] [<ffffffff8140827c>] ? __dev_queue_xmit+0x3d3/0x751
> [ 91.051322] [<ffffffff8140827c>] __dev_queue_xmit+0x3d3/0x751
> [ 91.052061] [<ffffffff813f5620>] ? __alloc_skb+0xae/0x19c
> [ 91.052760] [<ffffffff81408605>] dev_queue_xmit+0xb/0xd
> [ 91.053431] [<ffffffff8146ac86>] arp_xmit+0x32/0x7e
> [ 91.054069] [<ffffffff8146ad0e>] arp_send_dst+0x3c/0x42
> [ 91.054741] [<ffffffff8146af8f>] arp_solicit+0x27b/0x28e
> [ 91.055423] [<ffffffff8140f08f>] neigh_probe+0x4a/0x5e
> [ 91.056097] [<ffffffff8141066f>] __neigh_event_send+0x1d0/0x21b
> [ 91.056853] [<ffffffff814106e5>] neigh_event_send+0x2b/0x2d
> [ 91.057569] [<ffffffff81411e45>] neigh_resolve_output+0x18/0x12e
> [ 91.058341] [<ffffffff814421e8>] ip_finish_output2+0x3c0/0x41c
> [ 91.059087] [<ffffffff81442a7b>] ip_finish_output+0x132/0x13e
> [ 91.059820] [<ffffffff81442aa8>] NF_HOOK_COND.constprop.43+0x21/0x8a
> [ 91.060634] [<ffffffff81434c61>] ? rcu_read_unlock+0x5d/0x5f
> [ 91.061362] [<ffffffff81434e96>] ? nf_hook_slow+0x94/0x9e
> [ 91.062061] [<ffffffff81443c19>] ip_output+0x65/0x6a
> [ 91.062703] [<ffffffff81441ae3>] dst_output+0x2b/0x30
> [ 91.063350] [<ffffffff8144355a>] ip_local_out+0x2a/0x31
> [ 91.064025] [<ffffffff813985f1>] vrf_xmit+0x1f6/0x417
> [ 91.064675] [<ffffffff81081976>] ? __lock_is_held+0x38/0x50
> [ 91.065393] [<ffffffff81407ba8>] dev_hard_start_xmit+0x154/0x337
> [ 91.066170] [<ffffffff81427f15>] sch_direct_xmit+0x98/0x16c
> [ 91.066916] [<ffffffff814082fc>] __dev_queue_xmit+0x453/0x751
> [ 91.067663] [<ffffffff81427011>] ? eth_header+0x27/0xaf
> [ 91.068353] [<ffffffff81408605>] dev_queue_xmit+0xb/0xd
> [ 91.069031] [<ffffffff81411f40>] neigh_resolve_output+0x113/0x12e
> [ 91.069834] [<ffffffff81397881>] dst_neigh_output.isra.20+0x13b/0x148
> [ 91.070655] [<ffffffff81397992>] vrf_finish_output+0x104/0x139
> [ 91.071400] [<ffffffff81397b5d>] vrf_output+0x5c/0xc1
> [ 91.072055] [<ffffffff81443525>] ? __ip_local_out+0x9e/0xa9
> [ 91.072769] [<ffffffff81441ae3>] dst_output+0x2b/0x30
> [ 91.073419] [<ffffffff8144355a>] ip_local_out+0x2a/0x31
> [ 91.074093] [<ffffffff814443cb>] ip_send_skb+0x14/0x38
> [ 91.074756] [<ffffffff8144441d>] ip_push_pending_frames+0x2e/0x31
> [ 91.075533] [<ffffffff814650ca>] raw_sendmsg+0x788/0x9d2
> [ 91.076224] [<ffffffff8101c65c>] ? paravirt_sched_clock+0x9/0xd
> [ 91.076984] [<ffffffff81030008>] ? native_cpu_up+0x214/0x7c1
> [ 91.077710] [<ffffffff81085cd9>] ? lock_release+0x20f/0x4c4
> [ 91.078446] [<ffffffff81472438>] inet_sendmsg+0x35/0x5c
> [ 91.079135] [<ffffffff813ed311>] sock_sendmsg_nosec+0x12/0x1d
> [ 91.079873] [<ffffffff813ee1c5>] ___sys_sendmsg+0x1b1/0x21f
> [ 91.080607] [<ffffffff81085cd9>] ? lock_release+0x20f/0x4c4
> [ 91.081333] [<ffffffff814f421b>] ? __mutex_unlock_slowpath+0x152/0x15f
> [ 91.082191] [<ffffffff814f4231>] ? mutex_unlock+0x9/0xb
> [ 91.082872] [<ffffffff81085cd9>] ? lock_release+0x20f/0x4c4
> [ 91.083601] [<ffffffff81173107>] ? __fget_light+0x48/0x6f
> [ 91.084306] [<ffffffff813ee4ea>] __sys_sendmsg+0x40/0x5e
> [ 91.084995] [<ffffffff813ee4ea>] ? __sys_sendmsg+0x40/0x5e
> [ 91.085704] [<ffffffff813ee51c>] SyS_sendmsg+0x14/0x16
> [ 91.086371] [<ffffffff814f69bc>] entry_SYSCALL_64_fastpath+0x1f/0xbd
> [ 91.087206] [<ffffffff81081420>] ? trace_hardirqs_off_caller+0xbc/0x122
For this one, it looks vrf misses the _xmit_lock lockdep support.
We might need to factorize the code found for example in
bond_set_lockdep_class_one()
Have you run lockdep before ? Strange that these issues were not
spotted earlier.
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