dump_tasks accesses __task_cred() without being in a RCU read side critical section. tasklist_lock is not protecting that when CONFIG_TREE_PREEMPT_RCU=y. Add a rcu_read_lock/unlock() section around the code which accesses __task_cred(). Signed-off-by: Thomas Gleixner Cc: linux-mm@kvack.org --- mm/oom_kill.c | 3 +++ 1 file changed, 3 insertions(+) Index: linux-2.6-tip/mm/oom_kill.c =================================================================== --- linux-2.6-tip.orig/mm/oom_kill.c +++ linux-2.6-tip/mm/oom_kill.c @@ -329,10 +329,13 @@ static void dump_tasks(const struct mem_ task_unlock(p); continue; } + /* Protect __task_cred() access */ + rcu_read_lock(); printk(KERN_INFO "[%5d] %5d %5d %8lu %8lu %3d %3d %s\n", p->pid, __task_cred(p)->uid, p->tgid, mm->total_vm, get_mm_rss(mm), (int)task_cpu(p), p->signal->oom_adj, p->comm); + rcu_read_unlock(); task_unlock(p); } while_each_thread(g, p); } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/