netdev - Re: 4.6.3 kernel panic on ppp interface termination (__tcf_hash

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Message-ID: <58100198b6d14f77ce95740e4e912fc3@nuclearcat.com>
Date:	Wed, 06 Jul 2016 23:14:22 +0300
From:	nuclearcat@...learcat.com
To:	Cong Wang <xiyou.wangcong@...il.com>
Cc:	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Jamal Hadi Salim <jhs@...atatu.com>
Subject: Re: 4.6.3 kernel panic on ppp interface termination
 (__tcf_hash_release / spinlock )

On 2016-07-05 01:02, Cong Wang wrote:
> On Mon, Jul 4, 2016 at 12:07 PM,  <nuclearcat@...learcat.com> wrote:
>> A little bit more details:
>> 
>>  ~ # tc -s -d filter show dev ppp0 parent ffff:
>> filter protocol ip pref 100 u32
>> filter protocol ip pref 100 u32 fh 800: ht divisor 1
>> filter protocol ip pref 100 u32 fh 800::1 order 1 key ht 800 bkt 0 
>> flowid :1
>> (rule hit 156 success 156)
>>   match 00000000/00000000 at 12 (success 156 )
>>         action order 1:  police 0x1 rate 4024Kbit burst 503000b mtu 
>> 2Kb
>> action drop overhead 0b linklayer unspec
>> ref 1 bind 1
>>         Action statistics:
>>         Sent 10564 bytes 156 pkt (dropped 0, overlimits 0 requeues 0)
>>         backlog 0b 0p requeues 0
>> 
>> 
>> Panic occurs when i delete ingress qdisc
>> 
>> tc qdisc del dev ppp0 ingress
>> 
>> After reversing commits (and some related commits)
>>         1d4150c02c5709fdfd80f10368a31867de35e72e
>>         ddf97ccdd7cb7e00daba465a5c947b8d941dc2a4
>> 
>> Problem is not occurring.
>> 
>> I'm not certainly sure this commits are causing issue, it is very hard 
>> to
>> reverse patches on this particular system.
>> 
> 
> Can you check if the following commit helps?
> 
> commit a03e6fe569713fb3ff0714f8fd7c8785c0ca9e22
> Author: WANG Cong <xiyou.wangcong@...il.com>
> Date:   Mon Jun 6 09:54:30 2016 -0700
> 
>     act_police: fix a crash during removal
Yes, it fixes issue, thanks.