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    SubjectRe: 2.6.18-mm2

    (please always do reply-to-all)

    On Thu, 28 Sep 2006 17:50:31 +0000 (UTC)
    "Steve Fox" <drfickle@us.ibm.com> wrote:

    > On Thu, 28 Sep 2006 01:46:23 -0700, Andrew Morton wrote:
    >
    > > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.18/2.6.18-mm2/
    >
    > Panic on boot. This machine booted 2.6.18-mm1 fine. em64t machine.
    >
    > TCP bic registered
    > TCP westwood registered
    > TCP htcp registered
    > NET: Registered protocol family 1
    > NET: Registered protocol family 17
    > Unable to handle kernel paging request at ffffffffffffffff RIP:
    > [<ffffffff8047ef93>] packet_notifier+0x163/0x1a0
    > PGD 203027 PUD 2b031067 PMD 0
    > Oops: 0000 [1] SMP
    > last sysfs file:
    > CPU 0
    > Modules linked in:
    > Pid: 1, comm: swapper Not tainted 2.6.18-mm2-autokern1 #1
    > RIP: 0010:[<ffffffff8047ef93>] [<ffffffff8047ef93>] packet_notifier+0x163/0x1a0
    > RSP: 0000:ffff810bffcbde90 EFLAGS: 00010286
    > RAX: 0000000000000000 RBX: ffff810bff4a1000 RCX: 2222222222222222
    > RDX: ffff810bff4a1000 RSI: 0000000000000005 RDI: ffffffff8055f5e0
    > RBP: ffffffffffffffff R08: 0000000000007616 R09: 000000000000000e
    > R10: 0000000000000006 R11: ffffffff803373f0 R12: 0000000000000000
    > R13: 0000000000000005 R14: ffff810bff4a1000 R15: 0000000000000000
    > FS: 0000000000000000(0000) GS:ffffffff805d8000(0000) knlGS:0000000000000000
    > CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
    > CR2: ffffffffffffffff CR3: 0000000000201000 CR4: 00000000000006e0
    > Process swapper (pid: 1, threadinfo ffff810bffcbc000, task ffff810bffcbb510)
    > Stack: ffff810bff4a1000 ffffffff8055f4c0 0000000000000000 ffff810bffcbdef0
    > 0000000000000000 ffffffff8042736e 0000000000000000 0000000000000000
    > 0000000000000000 ffffffff8061c68d ffffffff806260f0 ffffffff80207182
    > Call Trace:
    > [<ffffffff8042736e>] register_netdevice_notifier+0x3e/0x70
    > [<ffffffff8061c68d>] packet_init+0x2d/0x53
    > [<ffffffff80207182>] init+0x162/0x330
    > [<ffffffff8020a9d8>] child_rip+0xa/0x12
    > [<ffffffff8033c2a2>] acpi_ds_init_one_object+0x0/0x82
    > [<ffffffff80207020>] init+0x0/0x330
    > [<ffffffff8020a9ce>] child_rip+0x0/0x12
    >
    >
    > Code: 48 8b 45 00 0f 18 08 49 83 fd 02 4c 8d 65 f8 0f 84 f8 fe ff
    > RIP [<ffffffff8047ef93>] packet_notifier+0x163/0x1a0
    > RSP <ffff810bffcbde90>
    > CR2: ffffffffffffffff
    > <0>Kernel panic - not syncing: Attempted to kill init!
    >

    I'm really struggling to work out what went wrong there. Comparing your
    miserable 20 bytes of code to my object code makes me think that this:

    struct packet_sock *po = pkt_sk(sk);

    returned -1, perhaps in %ebp. But it's all very crude.

    Perhaps you could compile that kernel with CONFIG_DEBUG_INFO, rerun it (the
    addresses might change) then have a poke around with `gdb vmlinux' (or
    maybe just addr2line) to work out where it's really oopsing?

    I don't see much which has changed in that area recently.
    -
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