2.6.17-mm3: swsusp fails when process is debugged by ptrace

[Jeremy Fitzhardinge <jeremy@goop.org>]

If I try to suspend the machine while a process debug-stopped by ptrace, 
suspend fails:

PM: Preparing system for mem sleep
Freezing cpus ...
Breaking affinity for irq 0
Breaking affinity for irq 1
Breaking affinity for irq 12
Breaking affinity for irq 23
CPU 1 is now offline
SMP alternatives: switching to UP code
CPU1 is down
Stopping tasks: ==========================================================================================================================================================
stopping tasks timed out after 20 seconds (13 tasks remaining):
 khubd
 kseriod
 pdflush
 pdflush
 kswapd0
 kprefetchd
 pccardd
 kirqd
 kjournald
 kauditd
 knodemgrd_0
 kjournald
 test-vsnprintf
Restarting tasks...<6> Strange, khubd not stopped
Strange, kseriod not stopped
Strange, pdflush not stopped
Strange, pdflush not stopped
Strange, kswapd0 not stopped
Strange, kprefetchd not stopped
Strange, pccardd not stopped
Strange, kirqd not stopped
Strange, kjournald not stopped
Strange, kauditd not stopped
Strange, knodemgrd_0 not stopped
Strange, kjournald not stopped
Strange, test-vsnprintf not stopped
done
Thawing cpus ...

In this case, test-vsnprintf is stopped in a breakpoint in gdb.  If I 
quit it, then suspend works as expected.

   J

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