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lockdep: fix debug_show_all_locks()

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fix the oops that can be seen in:

   http://bugzilla.kernel.org/attachment.cgi?id=13828&action=view

it is not safe to print the locks of running tasks.

(even with this fix we have a small race - but this is a debug
 function after all.)

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
This commit is contained in:
Ingo Molnar 2007-12-05 15:46:09 +01:00
parent 41a2d6cfa3
commit 856848737b
1 changed files with 7 additions and 0 deletions
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7
kernel/lockdep.c
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@ -3173,6 +3173,13 @@ retry:
printk(" locked it.\n");
do_each_thread(g, p) {
/*
* It's not reliable to print a task's held locks
* if it's not sleeping (or if it's not the current
* task):
*/
if (p->state == TASK_RUNNING && p != current)
continue;
if (p->lockdep_depth)
lockdep_print_held_locks(p);
if (!unlock)