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    SubjectRe: Kernel boot hangs on commit "switch fput to task_work_add"
    On Sat, Jul 14, 2012 at 04:19:03PM +0100, Al Viro wrote:
    > On Sat, Jul 14, 2012 at 10:34:59PM +0800, Fengguang Wu wrote:
    > > On Sat, Jul 14, 2012 at 03:14:15PM +0100, Al Viro wrote:
    > > > On Sat, Jul 14, 2012 at 09:58:49PM +0800, Fengguang Wu wrote:
    > > > > > Hi Al, here I got the output for
    > > > > >
    > > > > > (qemu) sendkey alt-sysrq-l
    > > > > > (qemu) sendkey alt-sysrq-t
    > > > >
    > > > > I repeated that several times and here are the results.
    > > > >
    > > > > (qemu) sendkey alt-sysrq-l
    > > > > (qemu) sendkey alt-sysrq-l
    > > > > (qemu) sendkey alt-sysrq-l
    > > > > (qemu) sendkey alt-sysrq-t
    > > > > (qemu) sendkey alt-sysrq-t
    > > > > (qemu) quit
    > > > >
    > > > > The user space shutdown is polling on something, which prevents the
    > > > > system from reboot..
    > > >
    > > > Which userland it is?
    > >
    > > It's a customized ubuntu core. The original tgz image is downloaded
    > > here, however it's not directly usable as initrd.. Should I send my
    > > hacked one?
    >
    > Sigh... FWIW, with your config neither the mainline nor the tree you'd
    > been testing manage to boot with .deb produced by squeeze make-kpkg.
    > Both in the same way - they get to busybox, mount(8) in there keeps
    > failing wiht -ENODEV all the time and the damn thing ends up in
    > busybox shell. Fsck knows what's going on - apparently the damn thing
    > also redirects all printks someplace invisible as soon as it gets to
    > userland, so the obvious ways to see what's going on do not work.
    > RTFS(busybox) time, I guess...
    >
    > With reasonably sane config both trees work fine. I'll grab your image
    > and see what happens with it.

    Err, sorry for that! This is some weird randconfig setup, after all...
    I've sent you my hacked initrd in a big email, hope you can receive it.
    As I already have the reproduce environment, I can help debug it, too.

    Thanks,
    Fengguang


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