netdev - Re: Fw: [Bug 32772] New: PROBLEM: kernel BUG at net/ipv4/inetpeer.c:386

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Date:	Wed, 06 Apr 2011 18:05:23 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
Cc:	netdev@...r.kernel.org, dimetrios@...il.com,
	David Miller <davem@...emloft.net>
Subject: Re: Fw: [Bug 32772] New: PROBLEM: kernel BUG at
 net/ipv4/inetpeer.c:386

Le mercredi 06 avril 2011 à 08:18 -0700, Stephen Hemminger a écrit :
> 
> Begin forwarded message:
> 
> Date: Wed, 6 Apr 2011 07:39:54 GMT
> From: bugzilla-daemon@...zilla.kernel.org
> To: shemminger@...ux-foundation.org
> Subject: [Bug 32772] New: PROBLEM: kernel BUG at net/ipv4/inetpeer.c:386
> 
> 
> https://bugzilla.kernel.org/show_bug.cgi?id=32772
> 
>            Summary: PROBLEM: kernel BUG at net/ipv4/inetpeer.c:386
>            Product: Networking
>            Version: 2.5
>     Kernel Version: 2.6.38
>           Platform: All
>         OS/Version: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: normal
>           Priority: P1
>          Component: IPV4
>         AssignedTo: shemminger@...ux-foundation.org
>         ReportedBy: dimetrios@...il.com
>         Regression: No
> 
> 
> Kernel oopses periodically with 'kernel BUG at net/ipv4/inetpeer.c:386'
> message. Machine is used as BGP router and runs Quagga. Nonordinary kernel
> config option set: CONFIG_IP_FIB_TRIE=y.
> Two traces:
> --------------------trace begin--------------
> [625279.329241] kernel BUG at net/ipv4/inetpeer.c:386!

Hmm...

        if (atomic_cmpxchg(&p->refcnt, 1, -1) == 1) {
                struct inet_peer __rcu **stack[PEER_MAXDEPTH];
                struct inet_peer __rcu ***stackptr, ***delp;
                if (lookup(&p->daddr, stack, base) != p)
                        BUG();

So we cant find a peer in AVL tree, while we really should at this stage.


This reminds me a possible memory corruption (from another layer)

Could Dmitry try to boot with boot parameter "slub_nomerge" , to make sure
inetpeer layer doesnt share its kmem_cache with a corrupter ?



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