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Oleg Nesterov 4af4206be2 tracing: Fix syscall_*regfunc() vs copy_process() race 
syscall_regfunc() and syscall_unregfunc() should set/clear
TIF_SYSCALL_TRACEPOINT system-wide, but do_each_thread() can race
with copy_process() and miss the new child which was not added to
the process/thread lists yet.

Change copy_process() to update the child's TIF_SYSCALL_TRACEPOINT
under tasklist.

Link: http://lkml.kernel.org/p/20140413185854.GB20668@redhat.com

Cc: stable@vger.kernel.org # 2.6.33
Fixes: a871bd33a6 "tracing: Add syscall tracepoints"
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
 		2014-06-21 00:15:12 -04:00
..
events Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-06-12 19:42:15 -07:00
define_trace.h tracing: Add DEFINE_EVENT_FN() macro 2013-06-20 22:24:32 -07:00
ftrace.h tracing: Add __get_dynamic_array_len() macro for trace events 2014-06-04 14:29:33 -04:00
syscall.h tracing: Fix syscall_*regfunc() vs copy_process() race 2014-06-21 00:15:12 -04:00