netdev - Re: kernel panic TPROXY , vanilla 4.7.1

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Date:	Wed, 17 Aug 2016 08:42:05 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Denys Fedoryshchenko <nuclearcat@...learcat.com>
Cc:	Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: kernel panic TPROXY , vanilla 4.7.1

On Wed, 2016-08-17 at 17:31 +0300, Denys Fedoryshchenko wrote:
> Hi!
> 
> Tried to run squid on latest kernel, and hit a panic
> Sometimes it just shows warning in dmesg (but doesnt work properly)
> [   75.701666] IPv4: Attempt to release TCP socket in state 10 
> ffff88102d430780
> [   83.866974] squid (2700) used greatest stack depth: 12912 bytes left
> [   87.506644] IPv4: Attempt to release TCP socket in state 10 
> ffff880078a48780
> [  114.704295] IPv4: Attempt to release TCP socket in state 10 
> ffff881029f8ad00
> 
> I cannot catch yet oops/panic message, netconsole not working.
> 
> After triggering warning message 3 times, i am unable to run squid 
> anymore (without reboot), and in netstat it doesnt show port running.
> 
> firewall is:
> *mangle
> -A PREROUTING -p tcp -m socket -j DIVERT
> -A PREROUTING -p tcp -m tcp --dport 80 -i eno1 -j TPROXY --on-port 3129 
> --on-ip 0.0.0.0 --tproxy-mark 0x1/0x1
> -A DIVERT -j MARK --set-xmark 0x1/0xffffffff
> -A DIVERT -j ACCEPT
> 
> routing
> ip rule add fwmark 1 lookup 100
> ip route add local default dev eno1 table 100
> 
> 
> squid config is default with tproxy option
> http_port 3129 tproxy
> 

Hmppff... sorry for this, I will send a fix.

Thanks for the report !