Re: kernel BUG at kernel/exit.c:792!

From: Manfred Spraul
Date: Wed Dec 03 2003 - 12:49:53 EST

Srivatsa Vaddagiri wrote:

--- base.c 2003-10-26 00:13:57.000000000 +0530

+++ base.c.fix 2003-12-03 17:20:18.877679360 +0530
@@ -1669,7 +1669,7 @@
do {
int tid = task->pid;
if (!pid_alive(task))
- continue;
+ break;

No, a break would be wrong: The test detects already dead tasks that are still listed in the task list. If such a task is found, then it shouldn't be listed in /proc/, but the readdir call should continue to scan the task list.

But I don't understand the oops:
__exit_sighand clears current->sighand, and then in the next line __unhash_process removes the thread from the task list. But that's under write_lock_irq(&tasklist_lock), and get_tid_list runs under read_lock(&tasklist_lock). It should be impossible that ->sighand is NULL and the task is still listed in the task list.


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