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    SubjectRe: [2.6.21.1] soft lockup when removing netconsole module
    > > > > > > Seems to be hrtimers related - CC'ed Thomas.
    > > > > > I doubt that. The tick interrupt just finds out, that the machine is
    > > > > > stuck in rmmod.
    > > > > > > > Also the rmmod hangs and would not exit even with kill -9. It also
    > > > > > > > sucks up 100% cpu.
    > > > > > Can you please enable CONFIG_PROVE_LOCKING ?
    > > > > Luckily I already had :-)
    > > > > Here is its output:
    > > > So there is no output from lockdep, during the rmmod hang ? The rmmod
    > > Nope, just other subsystems (nfs, usb) minutes before that.
    > Hmm. Can you provide the output of that ? Might be some stale stuff
    > leading to the hang later.

    It is output like:
    [ 843.122782] usb 7-2: usbfs: USBDEVFS_CONTROL failed cmd newhidups rqt 161 rq 1 len 10 ret -110
    [ 1292.121131] usb 7-2: usbfs: USBDEVFS_CONTROL failed cmd newhidups rqt 161 rq 1 len 10 ret -110

    and about the nfs server temporarily not available. Please note that I
    did not do the rmmod from a nfs mountpoint.


    Folkert van Heusden

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