On Fri, Jun 23, 2006 at 05:46:23PM -0400, Jeff Dike wrote:
> On Fri, Jun 23, 2006 at 05:07:14PM -0400, Theodore Tso wrote:
> > Well, because my host kernel is running a completely stock 2.6.17
> > kernel and so I don't have the SKAS patch applied.  If the goal is to
> > abandon tt mode, it would be really nice if the SKAS patch gets
> > integrated into mainline first....
> 
> UML has a form of skas which runs on stock hosts.  defconfig will give
> you a CONFIG_MODE_SKAS, !CONFIG_MODE_TT UML which will run on an
> unmodified host.

OK, so now what did I do wrong?  Host is 2.6.17; running on a
dual-core Pentium M.   UML is 2.6.17-mm1 without any patches:

<tytso@candygram>       {/usr/projects/uml/linux-2.6.17-mm1}
32% ./linux
Checking that ptrace can change system call numbers...OK
Checking syscall emulation patch for ptrace...OK
Checking advanced syscall emulation patch for ptrace...OK
Checking for tmpfs mount on /dev/shm...OK
Checking PROT_EXEC mmap in /dev/shm/...OK
Checking for the skas3 patch in the host:
  - /proc/mm...not found
  - PTRACE_FAULTINFO...not found
  - PTRACE_LDT...not found
UML running in SKAS0 mode
Checking that ptrace can change system call numbers...OK
Checking syscall emulation patch for ptrace...OK
Checking advanced syscall emulation patch for ptrace...OK

<tytso@candygram>       {/usr/projects/uml/linux-2.6.17-mm1}
33%

Looks like UML just crashed (tm), without any explanation.  Kconfig
attached.  Suggestions on how to debug this would be appreciated.

						- Ted