Re: [PATCH net] net: ipv6: Do not duplicate DAD on link up

2017-05-03 Thread Cong Wang
On Wed, May 3, 2017 at 2:29 PM, David Ahern wrote: > On 5/3/17 3:22 PM, Cong Wang wrote: >>> Andrey's reproducer program runs in a very tight loop, calling >>> 'unshare -n' and then spawning 2 sets of 14 threads running random ioctl >>> calls. The relevant networking sequence:

Re: [PATCH net] net: ipv6: Do not duplicate DAD on link up

2017-05-03 Thread David Ahern
On 5/3/17 3:22 PM, Cong Wang wrote: >> Andrey's reproducer program runs in a very tight loop, calling >> 'unshare -n' and then spawning 2 sets of 14 threads running random ioctl >> calls. The relevant networking sequence: >> >> 1. New network namespace created via unshare -n >> - ip6tnl0 device is

Re: [PATCH net] net: ipv6: Do not duplicate DAD on link up

2017-05-03 Thread Cong Wang
On Tue, May 2, 2017 at 2:43 PM, David Ahern wrote: > Andrey reported a warning triggered by the rcu code: > > [ cut here ] > WARNING: CPU: 1 PID: 5911 at lib/debugobjects.c:289 > debug_print_object+0x175/0x210 > ODEBUG: activate active (active state 1)

Re: [PATCH net] net: ipv6: Do not duplicate DAD on link up

2017-05-03 Thread David Miller
From: David Ahern Date: Tue, 2 May 2017 14:43:44 -0700 > Andrey reported a warning triggered by the rcu code: ... > Andrey's reproducer program runs in a very tight loop, calling > 'unshare -n' and then spawning 2 sets of 14 threads running random ioctl > calls. The relevant

Re: [PATCH net] net: ipv6: Do not duplicate DAD on link up

2017-05-03 Thread Andrey Konovalov
On Tue, May 2, 2017 at 11:43 PM, David Ahern wrote: > Andrey reported a warning triggered by the rcu code: > > [ cut here ] > WARNING: CPU: 1 PID: 5911 at lib/debugobjects.c:289 > debug_print_object+0x175/0x210 > ODEBUG: activate active (active state 1)

[PATCH net] net: ipv6: Do not duplicate DAD on link up

2017-05-02 Thread David Ahern
Andrey reported a warning triggered by the rcu code: [ cut here ] WARNING: CPU: 1 PID: 5911 at lib/debugobjects.c:289 debug_print_object+0x175/0x210 ODEBUG: activate active (active state 1) object type: rcu_head hint: (null) Modules linked in: CPU: 1 PID: 5911