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Message-ID: <1272817864.2173.123.camel@edumazet-laptop> Date: Sun, 02 May 2010 18:31:04 +0200 From: Eric Dumazet <eric.dumazet@...il.com> To: "\"Oleg A. Arkhangelsky\"" <sysoleg@...dex.ru> Cc: netdev@...r.kernel.org Subject: Re: Re: Kernel panic in fib_rules_lookup (kernel 2.6.32) Le dimanche 02 mai 2010 à 14:46 +0400, "Oleg A. Arkhangelsky" a écrit : > Hello, > > 09.03.10, 17:09, "Eric Dumazet" <eric.dumazet@...il.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. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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