Re: RTNL: assertion failed at net/ipv6/addrconf.c (1699)
From: Cong Wang
Date: Fri Aug 29 2014 - 18:54:54 EST
On Fri, Aug 29, 2014 at 12:53 PM, Sabrina Dubroca <sd@xxxxxxxxxxxxxxx> wrote:
> 2014-08-29, 11:14:48 -0700, Cong Wang wrote:
>> On Fri, Aug 29, 2014 at 8:26 AM, Tommi Rantala <tt.rantala@xxxxxxxxx> wrote:
>> > [ 77.297196] RTNL: assertion failed at net/ipv6/addrconf.c (1699)
>> > [ 77.298080] CPU: 0 PID: 4842 Comm: trinity-main Not tainted 3.17.0-rc2+ #30
>> > [ 77.299039] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
>> > [ 77.299789] ffff88003d76a618 ffff880026133c50 ffffffff8238ba79
>> > ffff880037c84520
>> > [ 77.300829] ffff880026133c90 ffffffff820bd52b 0000000000000000
>> > ffffffff82d86c40
>> > [ 77.301869] 0000000000000000 00000000f76fd1e1 ffff8800382d8000
>> > ffff8800382d8220
>> > [ 77.302906] Call Trace:
>> > [ 77.303246] [<ffffffff8238ba79>] dump_stack+0x4d/0x66
>> > [ 77.303928] [<ffffffff820bd52b>] addrconf_join_solict+0x4b/0xb0
>> > [ 77.304731] [<ffffffff820b031b>] ipv6_dev_ac_inc+0x2bb/0x330
>> > [ 77.305498] [<ffffffff820b0060>] ? ac6_seq_start+0x260/0x260
>> > [ 77.306257] [<ffffffff820b05fe>] ipv6_sock_ac_join+0x26e/0x360
>> > [ 77.307046] [<ffffffff820b0429>] ? ipv6_sock_ac_join+0x99/0x360
>> > [ 77.307798] [<ffffffff820cdd60>] do_ipv6_setsockopt.isra.5+0xa70/0xf20
>> I think we should just use rtnl_lock() instead of rcu_read_lock() there,
>> it is not a hot path worth optimization.
>> Please try the attached patch.
> note: it doesn't build as it is now, it needs:
> I just tried your patch with a basic test program (open
> socket/join/leave/close and open socket/join/close).
> I think you need to modify ipv6_sock_ac_close as well, or you can still
> trigger the assertion when closing the socket without leaving first.
You are absolutely right here.
Can I have your Signed-off-by and Tested-by before sending the patch
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