Re: [uml-devel] umls unresponsive & consuming 100% cpu time

[Jeff Dike <jdike@addtoit.com>]

On Sat, May 10, 2008 at 10:41:40AM +0200, Bram Matthys (Syzop) wrote:
> I also saw this on my console (which does not react either btw), not sure
> when it appeared.. at or very short after/before the time setting:
> Stub registers -
> ~        0 - 621a
> ~        1 - 13
> ~        2 - 621a
> ~        3 - 6215
> ~        4 - 8
> ~        5 - bfae182c
> ~        6 - 0
> ~        7 - 7b
> ~        8 - 7b
> ~        9 - 0
> ~        10 - 0
> ~        11 - ffffffff
> ~        12 - 1000be
> ~        13 - 73
> ~        14 - 200246
> ~        15 - bfae1810
> ~        16 - 7b
> wait_stub_done : failed to wait for SIGTRAP, pid = 26141, n = 26141, errno =
> 0, status = 0x1c7f

For this one, try this patch:

Index: linux-2.6.22/arch/um/os-Linux/skas/process.c
===================================================================
--- linux-2.6.22.orig/arch/um/os-Linux/skas/process.c	2008-04-14 10:44:33.000000000 -0400
+++ linux-2.6.22/arch/um/os-Linux/skas/process.c	2008-05-13 11:37:35.000000000 -0400
@@ -55,7 +55,7 @@ static int ptrace_dump_regs(int pid)
  * Signals that are OK to receive in the stub - we'll just continue it.
  * SIGWINCH will happen when UML is inside a detached screen.
  */
-#define STUB_SIG_MASK (1 << SIGVTALRM)
+#define STUB_SIG_MASK ((1 << SIGVTALRM) | (1 << SIGWINCH))
 
 /* Signals that the stub will finish with - anything else is an error */
 #define STUB_DONE_MASK (1 << SIGTRAP)

I doubt it will fix the time problem.  I'm going to chase vincent's
problem on the assusmption that you're seeing the same thing.  When I
figure that out, we'll see how true that is.


> The old 2.6.20.1 uml's react fine when setting time backwards, btw (well..
> within reasonable limits)

UML got its timekeeping redone as part of the tickless work and I'm
still shaking out bugs...

       	    	       Jeff


-- 
Work email - jdike at linux dot intel dot com

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