On Mon, 2011-09-05 at 13:25 +0000, Michael Büsch wrote: > On Sun, 4 Sep 2011 22:44:08 +0200 > Luka Perkov <open...@lukaperkov.net> wrote: > > Unhandled kernel unaligned access[#1]: > > Cpu 0 > > $ 0 : 00000000 00000000 00000006 00000011 > > $ 4 : d5bf9da3 80dbb548 00000006 0000c010 > > $ 8 : 0000c578 00000000 6e617332 6e617332 > > $12 : 00000000 00000000 00000000 00000000 > > $16 : 6fbb5ff7 80d05618 8028fab0 00000000 > > $20 : 8028fa28 80cba248 8028fabc 8028fabe > > $24 : 00000000 80d85a50 > > $28 : 8028e000 8028f9f0 81043d14 80cb8708 > > Hi : 00000235 > > Lo : 02922c00 > > epc : 80cb8968 nf_nat_setup_info+0x2e0/0x6e8 [nf_nat] > > Tainted: P > > ra : 80cb8708 nf_nat_setup_info+0x80/0x6e8 [nf_nat] > > Status: 1100fc03 KERNEL EXL IE > > Cause : 00800010 > > BadVA : 6fbb600f > > PrId : 00019641 (MIPS 24Kc) > > Modules linked in: gpio_keys_polled dwc_otg ath_pci ath_hal(P) lantiq_atm > > drv_dsl_cpe_api lantiq_mei ipt_MASQUERADE iptable_nat nf_nat xt_conntrack > > xt_NOTRACK iptable_raw xt_state nf_conntrack_ipv4 nf_defrag_ipv4 > > nf_conntrack pppoe pppox ipt_REJECT xt_TCPMSS ipt_LOG xt_comment > > xt_multiport xt_mac xt_limit iptable_mangle iptable_filter ip_tables > > xt_tcpudp x_tables ppp_async ppp_generic slhc br2684 atm drv_vmmc usbcore > > drv_tapi crc_ccitt drv_ifxos arc4 aes_generic crypto_algapi > > Process swapper (pid: 0, threadinfo=8028e000, task=80291bc0, tls=00000000) > > Stack : 81722280 8019bfa0 801c686c 80f4f800 c0a801c7 00000000 00000000 > > 00000000 > > c5780002 6ea9cbd9 00000000 00000000 00000000 a6a90600 d5bf9da3 > > 00000000 > > 6ea9cbd9 00000000 00000000 00000000 a6a90002 c0a801c7 00000000 > > 00000000 > > 00000000 c5780601 80cb9fd0 80cb8b0c 00000001 d5bf9da3 00000000 > > 00000000 > > c0a801c7 8028fae4 80fd8840 80d05618 8028fae8 d8263338 813ca98c > > 80fd8840 > > ... > > Call Trace: > > [<80cb8968>] nf_nat_setup_info+0x2e0/0x6e8 [nf_nat] > > [<80d1e158>] masquerade_tg+0xc0/0xe8 [ipt_MASQUERADE] > > [<80c646a8>] ipt_do_table+0x3e0/0x484 [ip_tables] > > [<80dee0c0>] nf_nat_rule_find+0x28/0x9c [iptable_nat] > > [<80dee290>] nf_nat_fn+0x120/0x1a0 [iptable_nat] > > [<801baa34>] nf_iterate+0x8c/0xfc > > [<801bab34>] nf_hook_slow+0x90/0x17c > > [<801c76c8>] ip_output+0xd8/0x104 > > [<8019a224>] __netif_receive_skb+0x4d4/0x578 > > [<80210128>] br_handle_frame+0x280/0x2b8 > > [<80199f9c>] __netif_receive_skb+0x24c/0x578 > > [<8019a370>] process_backlog+0xa8/0x188 > > [<8019a778>] net_rx_action+0x8c/0x1b8 > > [<800215f0>] __do_softirq+0xa8/0x154 > > [<800217f0>] do_softirq+0x48/0x68 > > [<800031c0>] plat_irq_dispatch+0xf4/0x164 > > [<800059ec>] ret_from_irq+0x0/0x4 > > [<80005be0>] r4k_wait+0x20/0x40 > > [<80007690>] cpu_idle+0x28/0x4c > > [<802a58d0>] start_kernel+0x35c/0x378 > > thanks. > I am still wondering how enabling preempt could possibly workaround/hide > an alignment bug. sounds strange to me. Does somebody have an idea? > > I didn't look too closely at the function yet, though. >
What is the exact opcode that is causing the problem and how bad is the bad address? (Yes, I could look up those things myself, and I might do it later if I have time.) Conor
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