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

[Rob Landley <rob@landley.net>]

So: I apply Blaisorblad's 2.6.12-bb2-skas0 rollup patch, build with skas 
support, and it crashes (as mentioned earlier) with:

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

And then a dump (which I pasted in a few messages back...)

Is there an obvious way to track this down further?  I ran it under strace and 
filtered out the setsigmask stuff, but unfortunately the result's not very 
interesting.  Lots of stuff happens, then:

waitpid(7944, [{WIFSTOPPED(s) && WSTOPSIG(s) == SIGSEGV}], WUNTRACED) = 7944
ptrace(PTRACE_GETREGS, 7944, 0, 0x88e1804) = 0
ptrace(PTRACE_GETFPXREGS, 7944, 0, 0x88e18b4) = 0
ptrace(PTRACE_CONT, 7944, 0, SIGSEGV)   = 0
--- SIGCHLD (Child exited) @ 0 (0) ---
waitpid(7944, [{WIFSTOPPED(s) && WSTOPSIG(s) == SIGUSR1}], WUNTRACED) = 7944
getpid()                                = 7939
ptrace(PTRACE_SETREGS, 7944, 0, 0x88e7764) = 0
ptrace(PTRACE_CONT, 7944, 0, SIG_0)     = 0
--- SIGCHLD (Child exited) @ 0 (0) ---
waitpid(7944, [{WIFSTOPPED(s) && WSTOPSIG(s) == SIGTRAP}], WUNTRACED) = 7944
ptrace(PTRACE_SETREGS, 7944, 0, 0x88e1804) = 0
ptrace(PTRACE_SETFPXREGS, 7944, 0, 0x88e18b4) = 0
ptrace(PTRACE_SYSCALL, 7944, 0, SIG_0)  = 0
--- SIGCHLD (Child exited) @ 0 (0) ---
waitpid(7944, [{WIFSTOPPED(s) && WSTOPSIG(s) == SIGSEGV}], WUNTRACED) = 7944
ptrace(PTRACE_GETREGS, 7944, 0, 0x88e1804) = 0
ptrace(PTRACE_GETFPXREGS, 7944, 0, 0x88e18b4) = 0
ptrace(PTRACE_CONT, 7944, 0, SIGSEGV)   = 0
waitpid(7944, [{WIFSIGNALED(s) && WTERMSIG(s) == SIGSEGV}], WUNTRACED) = 7944
--- SIGCHLD (Child exited) @ 0 (0) ---
ioctl(1, SNDCTL_TMR_TIMEBASE or TCGETS, 0x88e793c) = -1 ENOTTY (Inappropriate 
ioctl for device)
write(1, "Kernel panic - not syncing: get_"..., 131) = 131

And so on through a ptrace of it dumping stack.

Am I doing it right?  Is there anything I can do to help track this down?

Rob


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