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    SubjectRe: Linux 2.6.15-rc3
    On Tue, 29 Nov 2005 16:25:19 -0800
    Andrew Morton <akpm@osdl.org> wrote:

    > Stephen Hemminger <shemminger@osdl.org> wrote:
    > >
    > > [ 125.653485] <1>Fixing recursive fault but reboot is needed!
    > > [ 125.653620] ----------- [cut here ] --------- [please bite here ] ---------
    > > [ 125.653622] Kernel BUG at mm/mmap.c:1956
    > > [ 125.653624] invalid operand: 0000 [727] SMP
    > > [ 125.653625] CPU 0
    > > [ 125.653627] Modules linked in:
    > > [ 125.653629] Pid: 746, comm: hotplug Not tainted 2.6.15-rc3 #1
    > > [ 125.653631] RIP: 0010:[<ffffffff8016cecb>] <ffffffff8016cecb>{exit_mmap+235}
    > > [ 125.653636] RSP: 0018:ffff81007ebcfeb8 EFLAGS: 00010202
    > > [ 125.653639] RAX: 0000000000000000 RBX: ffff810002c0e3e0 RCX: 00000000000005b4
    > > [ 125.653642] RDX: 000000000000000f RSI: ffff81007fc2ead8 RDI: ffff81007ff5ca80
    > > [ 125.653645] RBP: 0000000000000000 R08: ffff81007ff2c920 R09: 0000000000000000
    > > [ 125.653647] R10: 0000000000000000 R11: 0000000000000246 R12: ffff81007eb785c0
    > > [ 125.653649] R13: 0000000000000001 R14: 0000000000000100 R15: 0000000000000000
    > > [ 125.653653] FS: 0000000000587850(0000) GS:ffffffff805c6800(0000) knlGS:0000000000000000
    > > [ 125.653655] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    > > [ 125.653658] CR2: 000000000040a9b0 CR3: 0000000000101000 CR4: 00000000000006e0
    > > [ 125.653661] Process hotplug (pid: 746, threadinfo ffff81007ebce000, task ffff81007ebcafa0)
    > > [ 125.653663] Stack: 000000000000003c ffff810002c0e3e0 ffff81007eb785c0 ffff81007eb78638
    > > [ 125.653668] ffff81007ebcafa0 ffffffff80130d61 0000000000000100 0000000000000100
    > > [ 125.653672] ffff81007ebcb5e4 ffffffff80135bb2
    > > [ 125.653675] Call Trace:<ffffffff80130d61>{mmput+49} <ffffffff80135bb2>{do_exit+578}
    > > [ 125.653682] <ffffffff8024f961>{__up_write+49} <ffffffff801366b8>{do_group_exit+248}
    > > [ 125.653687] <ffffffff8010dcee>{system_call+126}
    > > [ 125.653691]
    > > [ 125.653692] Code: 0f 0b 68 de 7e 3e 80 c2 a4 07 48 83 c4 10 5b 5d 41 5c c3 66
    > > [ 125.653700] RIP <ffffffff8016cecb>{exit_mmap+235} RSP <ffff81007ebcfeb8>
    > > [ 125.653704] <1>Fixing recursive fault but reboot is needed!
    > > [ 125.653841] ----------- [cut here ] --------- [please bite here ] ---------
    > > [ 125.653843] Kernel BUG at mm/mmap.c:1956
    >
    > That's
    >
    > BUG_ON(mm->nr_ptes > (FIRST_USER_ADDRESS+PMD_SIZE-1)>>PMD_SHIFT);
    >
    > It's hard to see how this is caused by a USB patch.
    >
    > Are you using the very latest Linus tree? You should...

    Yes, when I retested with the usb patch it was against a fresh git pull.
    So it probably isn't a USB problem but something that got introduced between
    the two (2.6.15-rc3 vs latest).

    I'll go back to the 2.6.15-rc3 tree and test usb fix.

    --
    Stephen Hemminger <shemminger@osdl.org>
    OSDL http://developer.osdl.org/~shemminger
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