Re: 2.6.24-rc5-mm1: problems with cat /proc/kpageflags

Matt Mackall
2007-12-16T18:27:53Z

On Sun, Dec 16, 2007 at 12:40:53PM +0100, Mariusz Kozlowski wrote:
> > cat /proc/kpageflags on sparc64 causes the box to lock.
> > I can not write on any terminal - but I can issue sysrqs and switch
> > between consoles.
> >
> > cat process hangs in read(3, ...
>
> cat /proc/kpagecount produces similar symptoms. box is locked - sysrq-w sshd trace:
>
> __down
> __down_interruptible
> kobject_get
> lock_kernel
> chrdev_open
> __dentry_open
> nameidata_to_filp
> open_pathname
> do_sys_open
> sparc32_open
> linux_sparc_syscall32

Perhaps this is related to sparsemem.

Can you change line 710 of fs/proc/proc_misc.c to:

ppage = NULL;

..and see if it still breaks?

--
Mathematics is the supreme nostalgia of our time.