Re: [PATCH 0/4] Was: deferring __fput()

From: Mimi Zohar
Date: Sun Jul 01 2012 - 21:47:45 EST

On Sun, 2012-07-01 at 21:57 +0100, Al Viro wrote:
> On Sun, Jul 01, 2012 at 03:50:02PM -0400, Mimi Zohar wrote:
> > Replacing it with a call to __fput(), the system boots.
> "it" being just the part under that if (unlikely(...)))? Very interesting... If so, we
> have some kernel thread ending up with delayed __fput() which somehow makes dracut (assuimg
> you are using fedora initramfs to go with fedora config) unhappy. With your own patch,
> doing async __fput() in a lot of cases when this one doesn't delay past the return to
> userland managing to survive the boot... I wonder which files end up triggering that fun
> and which kernel thread is responsible... Could you slap a printk() in there, showing
> file->f_dentry->d_inode->i_mode (octal) and at least file->f_dentry->
> Along with the current->comm[], all under that inner if (). And see which ones end up
> going that way by the time execve() of /sbin/init fails.

pid=1 uid=0 d_name=init comm=swapper/0 dev="rootfs" mode=100775
pid=1 uid=0 d_name=bash comm=swapper/0 dev="rootfs" mode=100755

> It would be nice to see which sys_mount() calls are made and which (if any) fail, BTW.
> I wonder if it even gets to mounting the right root...

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