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    SubjectRe: rmmod e1000 hangs (Was Re: 2.6.22-rc2-mm1)
    Herbert Xu wrote:
    > On Thu, May 24, 2007 at 08:47:13PM +1000, Herbert Xu wrote:
    >> On Thu, May 24, 2007 at 11:36:22AM +0100, Jeremy Fitzhardinge wrote:
    >>> I got a hang while rmmodding e1000. sysrq-t shows:
    >>> rmmod D 003FFAFC 6616 15923 15911 (NOTLB)
    >>> e9341e44 00000092 82318c15 003ffafc e9341e2c 00000000 e9341e14 823187a1
    >>> 003ffafc 00000000 c0123862 d3dbab80 d3dbad1c c2c08a40 77a67d01 000001ca
    >>> 00000292 e9341e24 c03799cd e9341e54 c0540840 e9341e44 00223389 000000ff
    >>> Call Trace:
    >>> [<c03777b1>] schedule_timeout+0x70/0x8e
    >>> [<c03777e4>] schedule_timeout_uninterruptible+0x15/0x17
    >>> [<c0133d04>] msleep+0x10/0x16
    >>> [<c030d5e0>] dev_close+0x39/0x6b
    >> Looks like we're spinning on __LINK_STATE_RX_SCHED. This means that
    >> someone called netif_poll_disable() without re-enabling it again.
    >> Perhaps e1000_io_error_detected? Auke?

    Should not be, e1000_io_error_detected will call e1000_down which does the
    netif_poll_disable, but e1000_io_resume nicely calls e1000_up again which does
    the netif_poll_enable again, unless io_resume somehow failed

    > I think the dual meaning of __LINK_STATE_RX_SCHED is seriously broken.
    > In dev_close we are waiting for any outstanding poll to terminate but
    > the same bit can either mean an outstanding poll or that poll has
    > been disabled.

    that seems more likely

    > It's a surprise that it has taken so many years for someone to report
    > a bug on it. I'll try to get this fixed up, probably by adding a bit.

    I get the feeling that a recent change exposed us to this, our lab has been
    seeing similar OOPS's yesterday out of nothing.

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      Last update: 2007-05-24 16:49    [W:0.031 / U:99.700 seconds]
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