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Message-ID: <05db01c2cbe5$4b4c34f0$9c2a3b80@zhengthinkpad>
From: "Haoqiang Zheng" <hzheng@cs.columbia.edu>
To: <linux-kernel@vger.kernel.org>
Subject: linux hangs with printk on schedule()
Date: Mon, 3 Feb 2003 19:35:16 -0500
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I found Linux hangs when printk is inserted to the function schedule().
Sure, it doesn't make much sense to add such a line to schedule(). But Linux
shouldn't hang anyway, right? It's assumed that printk can be inserted
safely to anywhere. So, is it a bug of Linux?

The linux I am running is 2.4.18-14, the same version used by Redhat 8.0.
The scheduler is Ingo's O(1) scheduler.


Here is a fragment of the code
****************************************************************
 switch (prev->state) {
     ------
     default:
            printk("deactivating task pid=%d
comm=%s\n",prev->pid,prev->comm);
             deactivate_task(prev, rq);
  }
******************************************************************

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