Re: [PATCH] Gerd Hoffman's move-vsyscall-into-user-address-range patch

[Ingo Molnar]

* Andrew Morton <akpm@xxxxxxxx> wrote:

> Rusty Russell <rusty@xxxxxxxxxxxxxxx> wrote:
> >
> > Name: Move vsyscall page out of fixmap into normal vma as per mmap
> 
> This causes mysterious hangs when starting init.
> 
> Distro is RH FC1, running SysVinit-2.85-5.
> 
> dmesg, sysrq-T and .config are at
> http://www.zip.com.au/~akpm/linux/patches/stuff/log-vmm - nothing leaps
> out.
> 
> This is the second time recently when a patch has caused this machine 
> to oddly hang in init.  It's possible that there's a bug of some form 
> in that version of init that we'll need to know about and take care of 
> in some fashion.

FC1 is like really ancient. I think there was a glibc bug that caused 
vsyscall related init hangs like that. To nevertheless let people run 
their old stuff there's a vdso=0 boot option in exec-shield.

	Ingo
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