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Date: Fri, 20 Jul 2001 16:52:49 +1000
From: Andrew Morton <andrewm@uow.edu.au>
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To: Niels Kristian Bech Jensen <nkbj@image.dk>
CC: "Linux kernel developer's mailing list" 
	<linux-kernel@vger.kernel.org>,
        Linus Torvalds <torvalds@transmeta.com>
Subject: Re: Oops in 2.4.7-pre9.
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Niels Kristian Bech Jensen wrote:
> 
> I get this oops while booting 2.4.7-pre9:

Kernel is trying to read /proc/pid entries for a kernel thread
which has called daemonize().  It has a null task_struct.mm.

I tested various other possible problems, such as making
/sbin/hotplug an elf executable and it looks OK, apart from
the /proc problem.

--- linux-2.4.7-pre9/fs/proc/base.c	Fri Jul 20 15:39:12 2001
+++ linux-akpm/fs/proc/base.c	Fri Jul 20 16:43:02 2001
@@ -670,7 +670,7 @@ static struct inode *proc_pid_make_inode
 	inode->u.proc_i.task = task;
 	inode->i_uid = 0;
 	inode->i_gid = 0;
-	if (ino == PROC_PID_INO || task->mm->dumpable) {
+	if (ino == PROC_PID_INO || (task->mm && task->mm->dumpable)) {
 		inode->i_uid = task->euid;
 		inode->i_gid = task->egid;
 	}
-
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