From: Eric Dumazet <eric.dumazet@gmail.com>
To: "\"Oleg A. Arkhangelsky\"" <sysoleg@yandex.ru>
Cc: netdev@vger.kernel.org
Subject: Re: Re: Kernel panic in fib_rules_lookup (kernel 2.6.32)
Date: Sun, 02 May 2010 18:31:04 +0200 [thread overview]
Message-ID: <1272817864.2173.123.camel@edumazet-laptop> (raw)
In-Reply-To: <382091272797186@web84.yandex.ru>
Le dimanche 02 mai 2010 à 14:46 +0400, "Oleg A. Arkhangelsky" a écrit :
> Hello,
>
> 09.03.10, 17:09, "Eric Dumazet" <eric.dumazet@gmail.com>:
>
> > Le mardi 09 mars 2010 à 10:44 +0300, "Oleg A. Arkhangelsky" a écrit :
> > > Hello,
> > >
> > > Got this kernel panic tomorrow. This PC is rather heavy loaded router with BGP full view (> 300K routes).
> > > We're using FIB_TRIE. Last time we got similar panic about 1 month ago. Please, let me know if you
> > > need additional information to debug (e.g. objdump). Thanks!
> > >
> > > Mar 9 10:08:55 bras-1 kernel: BUG: unable to handle kernel NULL pointer dereference at (null)
> > > Mar 9 10:08:55 bras-1 kernel: IP: [] fib_rules_lookup+0xa2/0xd0
> > > Mar 9 10:08:55 bras-1 kernel: *pde = 00000000
> > > Mar 9 10:08:55 bras-1 kernel: Thread overran stack, or stack corrupted
> >
> > Hmm...
>
> Got the same panic, at the same place (fib_rules_lookup+0xa2/0xd0). Looks like the problem with NULL dereference is somewhere in list_for_each_entry_rcu macro. But I don't understand how this can be.
>
> Any thoughts? :(
>
Do you have any modify rules activity ?
I dont understand why we need synchronize_rcu() in fib_nl_delrule() but
this certainly not a bug.
next prev parent reply other threads:[~2010-05-02 16:31 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-09 7:44 Kernel panic in fib_rules_lookup (kernel 2.6.32) "Oleg A. Arkhangelsky"
2010-03-09 17:09 ` Eric Dumazet
2010-05-02 10:46 ` "Oleg A. Arkhangelsky"
2010-05-02 16:31 ` Eric Dumazet [this message]
2010-05-02 17:14 ` "Oleg A. Arkhangelsky"
-- strict thread matches above, loose matches on Subject: below --
2010-03-09 17:21 "Oleg A. Arkhangelsky"
2010-03-09 18:22 ` Stephen Hemminger
2010-03-09 18:39 ` "Oleg A. Arkhangelsky"
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