Re: [uml-devel] Am I doing something wrong with -skas0?

[Jeff Dike <jdike@addtoit.com>]

On Tue, Jul 12, 2005 at 11:46:40PM -0500, Rob Landley wrote:
> VFS: Mounted root (hostfs filesystem) readonly.
> Kernel panic - not syncing: get_skas_faultinfo : failed to wait for 
> SIGUSR1/SIGTRAP, pid = 7944, n = 7944, errno = 0, status = 0xb

A bunch of people are seeing this.  What's supposed to happen when the 
segfault hits is that it's supposed to continue into the segfault handler.

The fact that it is terminating with SIGSEGV immediately after stopping with
SIGSEGV means that the signal handler couldn't be delivered for some reason.

Either the signal stack or handler aren't present, or the stack isn't writable.

So, maybe the stubs aren't being set up properly.  Can you gdb the thing, put
a breakpoint in get_skas_faultinfo, and look at /proc/<pid>/maps, where
pid is the pid being ptraced?

The last two pages, at 0x7fffe000 and 7ffff000 are the stubs.  The first
should be mapped in from the temp VM file with permissions r-x, and the
second should be anonymous with permissions rwx.

				Jeff


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