Re: [uml-devel] Uml left showstopper bugs for 2.6.14

[Kai Tan]

I tried the first patch, got the following error:

Kernel panic - not syncing: copy_context_skas0 : failed to wait for 
SIGUSR1/SIGTRAP, pid = 7182, n = 7182, errno = 0, status = 0xb7f

I got the same error even after applying the second patch.

My run command is the following:

linux stderr=1 ubd0=../../root_fs.rh-7.2-full.pristine.20020312

> From: Blaisorblade <blaisorblade@xxxxxxxx>
> To: user-mode-linux-devel@xxxxxxxxxxxxxxxxxxxxx
> CC: Jeff Dike <jdike@xxxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, 
> "Kai Tan" <mineown@xxxxxxxxxxx>
> Subject: Re: [uml-devel] Uml left showstopper bugs for 2.6.14
> Date: Sun, 9 Oct 2005 21:42:32 +0200
>
> Kai - go to the end, there are patches for your SKAS0 problem.
>
> On Sunday 09 October 2005 21:18, Blaisorblade wrote:
> > Here's a short and updated list of showstoppers for 2.6.14 release, from
> > the UML point of view.
>
> > 2) Someone broke endianness of COW driver macros in a header cleanup. I
> > have fixes.
> Just sent them.
> > 3) SKAS0 is broken on amd64 hosts, when frame pointers are disabled. 
> Jeff
> > has the fix, waiting end of testing.
>
> > 4) SKAS0 is broken with GCC 3.2.3, and potentially other GCC releases -
> > look at arch/um/include/sysdep-i386/stub.h: stub_syscall*() to see how. 
> I
> > have two fixes, choosing the safer one (it's all just simply reusing 
> code
> > from <asm/unistd.h>).
> Jeff, I've attached patches for this. Also found another problematic piece 
> of
> code, in stub-segv (same bad idea).
>
> The patch for that changes a bit more things that strictly needed - 
> complain
> if that's a problem for merging in 2.6.14.
>
> Kai Tan, the order of the patches is:
>
> uml-fix-misassembling-skas0-stub
> uml-fix-misassembling-skas0-stub-segv
>
> Note that the second is a bit less tested, so if both together cause 
> problems,
> try with only the first one.
>
> And remember to add "skas0" to the cmd line, to force UML to run in SKAS0
> mode.
> --
> Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
> Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 
> 215621894)
> http://www.user-mode-linux.org/~blaisorblade


> << uml-fix-misassembling-skas0-stub >>


> << uml-fix-misassembling-skas0-stub-segv >>


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