netdev - [BUG] RTNL assert fail via addrconf_join

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Message-ID: <20140314184214.34ae9bfb@nehalam.linuxnetplumber.net>
Date:	Fri, 14 Mar 2014 18:42:14 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	netdev@...r.kernel.org
Subject: [BUG] RTNL assert fail via addrconf_join_solicit

When doing VRRP which uses macvlan and multicast, we see the following
kernel assertion error.  This is on 3.10.33 but looks like no changes
in this area in recent kernels.


[  541.030090] RTNL: assertion failed at net/core/dev.c (4496)
[  541.031143] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G           O 3.10.33-1-amd64-vyatta #1
[  541.031145] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007
[  541.031146]  ffffffff8148a9f0 000000000000002f ffffffff813c98c1 ffff88007c4451f8
[  541.031148]  0000000000000000 0000000000000000 ffffffff813d3540 ffff88007fc03d18
[  541.031150]  0000880000000006 ffff88007c445000 ffffffffa0194160 0000000000000000
[  541.031152] Call Trace:
[  541.031153]  <IRQ>  [<ffffffff8148a9f0>] ? dump_stack+0xd/0x17
[  541.031180]  [<ffffffff813c98c1>] ? __dev_set_promiscuity+0x101/0x180
[  541.031183]  [<ffffffff813d3540>] ? __hw_addr_create_ex+0x60/0xc0
[  541.031185]  [<ffffffff813cfe1a>] ? __dev_set_rx_mode+0xaa/0xc0
[  541.031189]  [<ffffffff813d3a81>] ? __dev_mc_add+0x61/0x90
[  541.031198]  [<ffffffffa01dcf9c>] ? igmp6_group_added+0xfc/0x1a0 [ipv6]
[  541.031208]  [<ffffffff8111237b>] ? kmem_cache_alloc+0xcb/0xd0
[  541.031212]  [<ffffffffa01ddcd7>] ? ipv6_dev_mc_inc+0x267/0x300 [ipv6]
[  541.031216]  [<ffffffffa01c2fae>] ? addrconf_join_solict+0x2e/0x40 [ipv6]
[  541.031219]  [<ffffffffa01ba2e9>] ? ipv6_dev_ac_inc+0x159/0x1f0 [ipv6]
[  541.031223]  [<ffffffffa01c0772>] ? addrconf_join_anycast+0x92/0xa0 [ipv6]
[  541.031226]  [<ffffffffa01c311e>] ? __ipv6_ifa_notify+0x11e/0x1e0 [ipv6]
[  541.031229]  [<ffffffffa01c3213>] ? ipv6_ifa_notify+0x33/0x50 [ipv6]
[  541.031233]  [<ffffffffa01c36c8>] ? addrconf_dad_completed+0x28/0x100 [ipv6]
[  541.031241]  [<ffffffff81075c1d>] ? task_cputime+0x2d/0x50
[  541.031244]  [<ffffffffa01c38d6>] ? addrconf_dad_timer+0x136/0x150 [ipv6]
[  541.031247]  [<ffffffffa01c37a0>] ? addrconf_dad_completed+0x100/0x100 [ipv6]
[  541.031255]  [<ffffffff8105313a>] ? call_timer_fn.isra.22+0x2a/0x90
[  541.031258]  [<ffffffffa01c37a0>] ? addrconf_dad_completed+0x100/0x100 [ipv6]
[  541.031261]  [<ffffffff81053531>] ? run_timer_softirq+0x1a1/0x260
[  541.031267]  [<ffffffff810350cf>] ? kvm_clock_read+0x1f/0x30
[  541.031272]  [<ffffffff810132a5>] ? sched_clock+0x5/0x10
[  541.031274]  [<ffffffff81074bd5>] ? sched_clock_local+0x15/0x80
[  541.031276]  [<ffffffff8104d586>] ? __do_softirq+0xd6/0x1b0
[  541.031282]  [<ffffffff8149109c>] ? call_softirq+0x1c/0x30
[  541.031284]  [<ffffffff8100d835>] ? do_softirq+0x75/0xb0
[  541.031286]  [<ffffffff8104d7ed>] ? irq_exit+0xbd/0xc0


Also it looks like ipv6 anycast has same potential issue of changing
unicast filters without holding rtnl_lock.
 ipv6_ac_inc -> addrconf_join_solict ->  ipv6_dev_mc_inc

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