BUG: warning at kernel/rtmutex-debug.c:125/rt_mutex_debug_task_free() (Not tainted)
[<
c04051e3>] show_trace_log_lvl+0x58/0x16a
[<
c04057f0>] show_trace+0xd/0x10
[<
c0405900>] dump_stack+0x19/0x1b
[<
c043f03d>] rt_mutex_debug_task_free+0x35/0x6a
[<
c04224c0>] free_task+0x15/0x24
[<
c042378c>] copy_process+0x12bd/0x1324
[<
c0423835>] do_fork+0x42/0x113
[<
c04021dd>] sys_fork+0x19/0x1b
[<
c0403fb7>] syscall_call+0x7/0xb
In copy_process(), dup_task_struct() also duplicates the ->pi_lock,
->pi_waiters and ->pi_blocked_on members. rt_mutex_debug_task_free()
called from free_task() validates these members. However free_task() can
be invoked before these members are reset for the new task.
Move the initialization code before the first bail that can hit free_task().
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
if (!p)
goto fork_out;
+ rt_mutex_init_task(p);
+
#ifdef CONFIG_TRACE_IRQFLAGS
DEBUG_LOCKS_WARN_ON(!p->hardirqs_enabled);
DEBUG_LOCKS_WARN_ON(!p->softirqs_enabled);
p->lockdep_recursion = 0;
#endif
- rt_mutex_init_task(p);
-
#ifdef CONFIG_DEBUG_MUTEXES
p->blocked_on = NULL; /* not blocked yet */
#endif