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    SubjectRe: 2.6.16-rc5 pppd oops on disconnects
    On Fri, 2006-03-10 at 13:48 -0500, Bob Copeland wrote:
    > > > Call Trace:
    > > > [<c017592e>] sysfs_hash_and_remove+0x34/0x10a
    > > > [<c01e756e>] class_device_del+0xa0/0x11c
    > > > [<c01e75f5>] class_device_unregister+0xb/0x16
    > > > [<d01f81f3>] acm_tty_unregister+0x1d/0x63 [cdc_acm]
    > >
    > > This looks more like
    > >
    > Hmm... it looks different from that bug - in that case the root cause
    > was sysfs_make_dirent failing, presumably when the sysfs node for the
    > device was being set up, by unplugging and re-plugging the device a
    > lot. Here it's oopsing when the node is being removed, after it's
    > been in use a while and unplugged only once. But yes ppp may not have
    > anything to do with it. I'll try it on an older kernel to see if I
    > can reproduce there...

    The i_sem to i_mutex change started in the 2.6.16 series.
    Running against 2.6.15 would be interesting. Being able
    to repeat every time is a plus. I'm not that familiar
    with the sysfs stuff, but the slab poisoning is pretty
    damning. The dentry was released and then accessed.

    I looked at cdc_acm for disconnect and close and
    did not see any problems (such as trying to call
    tty_unregister_device twice for a device).

    Paul Fulghum
    Microgate Systems, Ltd

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      Last update: 2006-03-10 20:27    [W:0.020 / U:13.056 seconds]
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