• Peter Zijlstra's avatar
    [PATCH] rt-mutex: fixup rt-mutex debug code · bea493a0
    Peter Zijlstra authored
    
    
    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: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
    Acked-by: default avatarIngo Molnar <mingo@elte.hu>
    Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
    bea493a0